diff -Nr lua-5.5.0/Makefile lua-5.5.1/Makefile 39c39 < PLATS= guess aix bsd c89 freebsd generic ios linux macosx mingw posix solaris --- > PLATS= guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris 49c49 < R= $V.0 --- > R= $V.1 diff -Nr lua-5.5.0/README lua-5.5.1/README 2c2 < This is Lua 5.5.0, released on 15 Dec 2025. --- > This is Lua 5.5.1, released on 24 Jul 2026. diff -Nr lua-5.5.0/doc/contents.html lua-5.5.1/doc/contents.html 35c35 < Copyright © 2020–2025 Lua.org, PUC-Rio. --- > Copyright © 2020–2026 Lua.org, PUC-Rio. 708c708 < Thu Dec 4 17:32:26 UTC 2025 --- > Mon Jul 13 21:19:58 UTC 2026 711c711 < Last change: revised for Lua 5.5.0 --- > Last change: revised for Lua 5.5.1 diff -Nr lua-5.5.0/doc/manual.css lua-5.5.1/doc/manual.css 9a10,13 > pre.api { > white-space: normal ; > } > diff -Nr lua-5.5.0/doc/manual.html lua-5.5.1/doc/manual.html 22c22 < Copyright © 2020–2025 Lua.org, PUC-Rio. --- > Copyright © 2020–2026 Lua.org, PUC-Rio. 2103c2103 < foo() -- 'foo' can freely change any global --- > foo() -- 'foo' can freely change any global 3266c3266,3280 < Several functions in the API return pointers (const char*) --- > Several functions in the API have parameters > that are pointers to C strings (const char*). > Some of these parameters have an associated length (size_t). > Unless stated otherwise, > when there is an associated length, > the string can contain embedded zeros; > moreover, the pointer can be NULL if the length is zero. > When there is no associated length, > the pointer must point to a zero-terminated string. > In any case, the string contents should remain unchanged > until the function returns. > > >

> Several functions in the API also return pointers (const char*) 3675c3689 <

int lua_absindex (lua_State *L, int idx);

--- >

int lua_absindex (lua_State *L, int idx);

3687c3701 <

typedef void * (*lua_Alloc) (void *ud,
---
> typedef void * (*lua_Alloc) (void *ud,
3766c3780
< void lua_arith (lua_State *L, int op);
---
> void lua_arith (lua_State *L, int op);
3805c3819
< lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);
---
> lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);
3816c3830
< void lua_call (lua_State *L, int nargs, int nresults);
---
> void lua_call (lua_State *L, int nargs, int nresults);
3889c3903
< void lua_callk (lua_State *L,
---
> void lua_callk (lua_State *L,
3904c3918
< typedef int (*lua_CFunction) (lua_State *L);
---
> typedef int (*lua_CFunction) (lua_State *L);
3956c3970
< int lua_checkstack (lua_State *L, int n);
---
> int lua_checkstack (lua_State *L, int n);
3976c3990
< void lua_close (lua_State *L);
---
> void lua_close (lua_State *L);
3998c4012
< void lua_closeslot (lua_State *L, int index);
---
> void lua_closeslot (lua_State *L, int index);
4016c4030
< int lua_closethread (lua_State *L, lua_State *from);
---
> int lua_closethread (lua_State *L, lua_State *from);
4051c4065
< int lua_compare (lua_State *L, int index1, int index2, int op);
---
> int lua_compare (lua_State *L, int index1, int index2, int op);
4079c4093
< void lua_concat (lua_State *L, int n);
---
> void lua_concat (lua_State *L, int n);
4096c4110
< void lua_copy (lua_State *L, int fromidx, int toidx);
---
> void lua_copy (lua_State *L, int fromidx, int toidx);
4110c4124
< void lua_createtable (lua_State *L, int nseq, int nrec);
---
> void lua_createtable (lua_State *L, int nseq, int nrec);
4129c4143
< int lua_dump (lua_State *L,
---
> int lua_dump (lua_State *L,
4173c4187
< int lua_error (lua_State *L);
---
> int lua_error (lua_State *L);
4188c4202
< int lua_gc (lua_State *L, int what, ...);
---
> int lua_gc (lua_State *L, int what, ...);
4273c4287
< lua_Alloc lua_getallocf (lua_State *L, void **ud);
---
> lua_Alloc lua_getallocf (lua_State *L, void **ud);
4286c4300
< int lua_getfield (lua_State *L, int index, const char *k);
---
> int lua_getfield (lua_State *L, int index, const char *k);
4304c4318
< void *lua_getextraspace (lua_State *L);
---
> void *lua_getextraspace (lua_State *L);
4329c4343
< int lua_getglobal (lua_State *L, const char *name);
---
> int lua_getglobal (lua_State *L, const char *name);
4341c4355
< int lua_geti (lua_State *L, int index, lua_Integer i);
---
> int lua_geti (lua_State *L, int index, lua_Integer i);
4359c4373
< int lua_getmetatable (lua_State *L, int index);
---
> int lua_getmetatable (lua_State *L, int index);
4373c4387
< int lua_gettable (lua_State *L, int index);
---
> int lua_gettable (lua_State *L, int index);
4397c4411
< int lua_gettop (lua_State *L);
---
> int lua_gettop (lua_State *L);
4411c4425
< int lua_getiuservalue (lua_State *L, int index, int n);
---
> int lua_getiuservalue (lua_State *L, int index, int n);
4429c4443
< void lua_insert (lua_State *L, int index);
---
> void lua_insert (lua_State *L, int index);
4442c4456
< typedef ... lua_Integer;
---
> typedef ... lua_Integer;
4467c4481
< int lua_isboolean (lua_State *L, int index);
---
> int lua_isboolean (lua_State *L, int index);
4479c4493
< int lua_iscfunction (lua_State *L, int index);
---
> int lua_iscfunction (lua_State *L, int index);
4491c4505
< int lua_isfunction (lua_State *L, int index);
---
> int lua_isfunction (lua_State *L, int index);
4503c4517
< int lua_isinteger (lua_State *L, int index);
---
> int lua_isinteger (lua_State *L, int index);
4516c4530
< int lua_islightuserdata (lua_State *L, int index);
---
> int lua_islightuserdata (lua_State *L, int index);
4528c4542
< int lua_isnil (lua_State *L, int index);
---
> int lua_isnil (lua_State *L, int index);
4540c4554
< int lua_isnone (lua_State *L, int index);
---
> int lua_isnone (lua_State *L, int index);
4552c4566
< int lua_isnoneornil (lua_State *L, int index);
---
> int lua_isnoneornil (lua_State *L, int index);
4565c4579
< int lua_isnumber (lua_State *L, int index);
---
> int lua_isnumber (lua_State *L, int index);
4578c4592
< int lua_isstring (lua_State *L, int index);
---
> int lua_isstring (lua_State *L, int index);
4591c4605
< int lua_istable (lua_State *L, int index);
---
> int lua_istable (lua_State *L, int index);
4603c4617
< int lua_isthread (lua_State *L, int index);
---
> int lua_isthread (lua_State *L, int index);
4615c4629
< int lua_isuserdata (lua_State *L, int index);
---
> int lua_isuserdata (lua_State *L, int index);
4627c4641
< int lua_isyieldable (lua_State *L);
---
> int lua_isyieldable (lua_State *L);
4638c4652
< typedef ... lua_KContext;
---
> typedef ... lua_KContext;
4653c4667
< typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx);
---
> typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx);
4664c4678
< void lua_len (lua_State *L, int index);
---
> void lua_len (lua_State *L, int index);
4678c4692
< int lua_load (lua_State *L,
---
> int lua_load (lua_State *L,
4758c4772
< lua_State *lua_newstate (lua_Alloc f, void *ud,
---
> lua_State *lua_newstate (lua_Alloc f, void *ud,
4779c4793
< void lua_newtable (lua_State *L);
---
> void lua_newtable (lua_State *L);
4791c4805
< lua_State *lua_newthread (lua_State *L);
---
> lua_State *lua_newthread (lua_State *L);
4811c4825
< void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue);
---
> void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue);
4817,4818c4831,4838
< (The user values can be set and read with the functions
< lua_setiuservalue and lua_getiuservalue.)
---
> 
> 
> 
> The user values can be set and read with the functions
> lua_setiuservalue and lua_getiuservalue.
> The block of memory is suitably aligned for any ISO C object.
> (See macro LUAI_MAXALIGN in file luaconf.h for other
> alignment requirements.)
4834c4854
< 
int lua_next (lua_State *L, int index);
---
> int lua_next (lua_State *L, int index);
4872,4873c4892,4895
< See function next for the caveats of modifying
< the table during its traversal.
---
> 
> 
> 
> See function next for more details about the traversal.
4880c4902
< 
typedef ... lua_Number;
---
> typedef ... lua_Number;
4896c4918
< int lua_numbertointeger (lua_Number n, lua_Integer *p);
---
> int lua_numbertointeger (lua_Number n, lua_Integer *p);
4918c4940
< unsigned lua_numbertocstring (lua_State *L, int idx,
---
> unsigned lua_numbertocstring (lua_State *L, int idx,
4936c4958
< int lua_pcall (lua_State *L, int nargs, int nresults, int msgh);
---
> int lua_pcall (lua_State *L, int nargs, int nresults, int msgh);
4986c5008
< int lua_pcallk (lua_State *L,
---
> int lua_pcallk (lua_State *L,
5003c5025
< void lua_pop (lua_State *L, int n);
---
> void lua_pop (lua_State *L, int n);
5015c5037
< void lua_pushboolean (lua_State *L, int b);
---
> void lua_pushboolean (lua_State *L, int b);
5026c5048
< void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);
---
> void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);
5075c5097
< void lua_pushcfunction (lua_State *L, lua_CFunction f);
---
> void lua_pushcfunction (lua_State *L, lua_CFunction f);
5087c5109
< const char *lua_pushexternalstring (lua_State *L,
---
> const char *lua_pushexternalstring (lua_State *L,
5129c5151
< const char *lua_pushfstring (lua_State *L, const char *fmt, ...);
---
> const char *lua_pushfstring (lua_State *L, const char *fmt, ...);
5163c5185
< void lua_pushglobaltable (lua_State *L);
---
> void lua_pushglobaltable (lua_State *L);
5174c5196
< void lua_pushinteger (lua_State *L, lua_Integer n);
---
> void lua_pushinteger (lua_State *L, lua_Integer n);
5185c5207
< void lua_pushlightuserdata (lua_State *L, void *p);
---
> void lua_pushlightuserdata (lua_State *L, void *p);
5206c5228
< const char *lua_pushliteral (lua_State *L, const char *s);
---
> const char *lua_pushliteral (lua_State *L, const char *s);
5219c5241
< const char *lua_pushlstring (lua_State *L, const char *s, size_t len);
---
> const char *lua_pushlstring (lua_State *L, const char *s, size_t len);
5245c5267
< void lua_pushnil (lua_State *L);
---
> void lua_pushnil (lua_State *L);
5256c5278
< void lua_pushnumber (lua_State *L, lua_Number n);
---
> void lua_pushnumber (lua_State *L, lua_Number n);
5267c5289
< const char *lua_pushstring (lua_State *L, const char *s);
---
> const char *lua_pushstring (lua_State *L, const char *s);
5290c5312
< int lua_pushthread (lua_State *L);
---
> int lua_pushthread (lua_State *L);
5302c5324
< void lua_pushvalue (lua_State *L, int index);
---
> void lua_pushvalue (lua_State *L, int index);
5314c5336
< const char *lua_pushvfstring (lua_State *L,
---
> const char *lua_pushvfstring (lua_State *L,
5332c5354
< int lua_rawequal (lua_State *L, int index1, int index2);
---
> int lua_rawequal (lua_State *L, int index1, int index2);
5347c5369
< int lua_rawget (lua_State *L, int index);
---
> int lua_rawget (lua_State *L, int index);
5360c5382
< int lua_rawgeti (lua_State *L, int index, lua_Integer n);
---
> int lua_rawgeti (lua_State *L, int index, lua_Integer n);
5378c5400
< int lua_rawgetp (lua_State *L, int index, const void *p);
---
> int lua_rawgetp (lua_State *L, int index, const void *p);
5397c5419
< lua_Unsigned lua_rawlen (lua_State *L, int index);
---
> lua_Unsigned lua_rawlen (lua_State *L, int index);
5414c5436
< void lua_rawset (lua_State *L, int index);
---
> void lua_rawset (lua_State *L, int index);
5427c5449
< void lua_rawseti (lua_State *L, int index, lua_Integer i);
---
> void lua_rawseti (lua_State *L, int index, lua_Integer i);
5446c5468
< void lua_rawsetp (lua_State *L, int index, const void *p);
---
> void lua_rawsetp (lua_State *L, int index, const void *p);
5465c5487
< typedef const char * (*lua_Reader) (lua_State *L,
---
> typedef const char * (*lua_Reader) (lua_State *L,
5488c5510
< void lua_register (lua_State *L, const char *name, lua_CFunction f);
---
> void lua_register (lua_State *L, const char *name, lua_CFunction f);
5504c5526
< void lua_remove (lua_State *L, int index);
---
> void lua_remove (lua_State *L, int index);
5518c5540
< void lua_replace (lua_State *L, int index);
---
> void lua_replace (lua_State *L, int index);
5532c5554
< int lua_resume (lua_State *L, lua_State *from, int nargs,
---
> int lua_resume (lua_State *L, lua_State *from, int nargs,
5543c5565
< then you call lua_resume,
---
> Then you call lua_resume,
5581c5603
< void lua_rotate (lua_State *L, int idx, int n);
---
> void lua_rotate (lua_State *L, int idx, int n);
5601c5623
< void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);
---
> void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);
5613c5635
< void lua_setfield (lua_State *L, int index, const char *k);
---
> void lua_setfield (lua_State *L, int index, const char *k);
5632c5654
< void lua_setglobal (lua_State *L, const char *name);
---
> void lua_setglobal (lua_State *L, const char *name);
5644c5666
< void lua_seti (lua_State *L, int index, lua_Integer n);
---
> void lua_seti (lua_State *L, int index, lua_Integer n);
5663c5685
< int lua_setiuservalue (lua_State *L, int index, int n);
---
> int lua_setiuservalue (lua_State *L, int index, int n);
5677c5699
< int lua_setmetatable (lua_State *L, int index);
---
> int lua_setmetatable (lua_State *L, int index);
5695c5717
< void lua_settable (lua_State *L, int index);
---
> void lua_settable (lua_State *L, int index);
5715c5737
< void lua_settop (lua_State *L, int index);
---
> void lua_settop (lua_State *L, int index);
5735c5757
< void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud);
---
> void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud);
5748c5770
< typedef struct lua_State lua_State;
---
> typedef struct lua_State lua_State;
5769c5791
< int lua_status (lua_State *L);
---
> int lua_status (lua_State *L);
5793,5794c5815,5816
< [-0, +1, –]
< size_t lua_stringtonumber (lua_State *L, const char *s);
---
> [-0, +(0|1), –]
> size_t lua_stringtonumber (lua_State *L, const char *s);
5815c5837
< int lua_toboolean (lua_State *L, int index);
---
> int lua_toboolean (lua_State *L, int index);
5833c5855
< lua_CFunction lua_tocfunction (lua_State *L, int index);
---
> lua_CFunction lua_tocfunction (lua_State *L, int index);
5846c5868
< void lua_toclose (lua_State *L, int index);
---
> void lua_toclose (lua_State *L, int index);
5888c5910
< lua_Integer lua_tointeger (lua_State *L, int index);
---
> lua_Integer lua_tointeger (lua_State *L, int index);
5899c5921
< lua_Integer lua_tointegerx (lua_State *L, int index, int *isnum);
---
> lua_Integer lua_tointegerx (lua_State *L, int index, int *isnum);
5920c5942
< const char *lua_tolstring (lua_State *L, int index, size_t *len);
---
> const char *lua_tolstring (lua_State *L, int index, size_t *len);
5958c5980
< lua_Number lua_tonumber (lua_State *L, int index);
---
> lua_Number lua_tonumber (lua_State *L, int index);
5969c5991
< lua_Number lua_tonumberx (lua_State *L, int index, int *isnum);
---
> lua_Number lua_tonumberx (lua_State *L, int index, int *isnum);
5990c6012
< const void *lua_topointer (lua_State *L, int index);
---
> const void *lua_topointer (lua_State *L, int index);
6010c6032
< const char *lua_tostring (lua_State *L, int index);
---
> const char *lua_tostring (lua_State *L, int index);
6021c6043
< lua_State *lua_tothread (lua_State *L, int index);
---
> lua_State *lua_tothread (lua_State *L, int index);
6035c6057
< void *lua_touserdata (lua_State *L, int index);
---
> void *lua_touserdata (lua_State *L, int index);
6050c6072
< int lua_type (lua_State *L, int index);
---
> int lua_type (lua_State *L, int index);
6074c6096
< const char *lua_typename (lua_State *L, int tp);
---
> const char *lua_typename (lua_State *L, int tp);
6085c6107
< typedef ... lua_Unsigned;
---
> typedef ... lua_Unsigned;
6096c6118
< int lua_upvalueindex (int i);
---
> int lua_upvalueindex (int i);
6109c6131
< lua_Number lua_version (lua_State *L);
---
> lua_Number lua_version (lua_State *L);
6119c6141
< typedef void (*lua_WarnFunction) (void *ud, const char *msg, int tocont);
---
> typedef void (*lua_WarnFunction) (void *ud, const char *msg, int tocont);
6140c6162
< void lua_warning (lua_State *L, const char *msg, int tocont);
---
> void lua_warning (lua_State *L, const char *msg, int tocont);
6156c6178
< typedef int (*lua_Writer) (lua_State *L,
---
> typedef int (*lua_Writer) (lua_State *L,
6188c6210
< void lua_xmove (lua_State *from, lua_State *to, int n);
---
> void lua_xmove (lua_State *from, lua_State *to, int n);
6204c6226
< int lua_yield (lua_State *L, int nresults);
---
> int lua_yield (lua_State *L, int nresults);
6221c6243
< int lua_yieldk (lua_State *L,
---
> int lua_yieldk (lua_State *L,
6244c6266
< with the n results removed and
---
> with all the results (nresults) removed and
6345c6367
< The length of the string source.
---
> the length of the string source.
6445c6467
< lua_Hook lua_gethook (lua_State *L);
---
> lua_Hook lua_gethook (lua_State *L);
6456c6478
< int lua_gethookcount (lua_State *L);
---
> int lua_gethookcount (lua_State *L);
6467c6489
< int lua_gethookmask (lua_State *L);
---
> int lua_gethookmask (lua_State *L);
6478c6500
< int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
---
> int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
6531c6553
< fills in the fields source, short_src,
---
> fills in the fields source, srclen, short_src,
6564c6586
< const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
---
> const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
6605c6627
< int lua_getstack (lua_State *L, int level, lua_Debug *ar);
---
> int lua_getstack (lua_State *L, int level, lua_Debug *ar);
6628c6650
< const char *lua_getupvalue (lua_State *L, int funcindex, int n);
---
> const char *lua_getupvalue (lua_State *L, int funcindex, int n);
6647c6669
< typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
---
> typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
6696c6718
< void lua_sethook (lua_State *L, lua_Hook f, int mask, int count);
---
> void lua_sethook (lua_State *L, lua_Hook f, int mask, int count);
6746c6768
< const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);
---
> const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);
6762c6784,6786
< Parameters ar and n are as in the function lua_getlocal.
---
> Parameters ar and n are as in the function lua_getlocal,
> except that ar cannot be NULL,
> as lua_setlocal only operates on activation records.
6770c6794
< const char *lua_setupvalue (lua_State *L, int funcindex, int n);
---
> const char *lua_setupvalue (lua_State *L, int funcindex, int n);
6794c6818
< void *lua_upvalueid (lua_State *L, int funcindex, int n);
---
> void *lua_upvalueid (lua_State *L, int funcindex, int n);
6820c6844
< void lua_upvaluejoin (lua_State *L, int funcindex1, int n1,
---
> void lua_upvaluejoin (lua_State *L, int funcindex1, int n1,
6895c6919
< void luaL_addchar (luaL_Buffer *B, char c);
---
> void luaL_addchar (luaL_Buffer *B, char c);
6907c6931
< const void luaL_addgsub (luaL_Buffer *B, const char *s,
---
> const void luaL_addgsub (luaL_Buffer *B, const char *s,
6921c6945
< void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);
---
> void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);
6935c6959
< void luaL_addsize (luaL_Buffer *B, size_t n);
---
> void luaL_addsize (luaL_Buffer *B, size_t n);
6948c6972
< void luaL_addstring (luaL_Buffer *B, const char *s);
---
> void luaL_addstring (luaL_Buffer *B, const char *s);
6961c6985
< void luaL_addvalue (luaL_Buffer *B);
---
> void luaL_addvalue (luaL_Buffer *B);
6981c7005
< void luaL_argcheck (lua_State *L,
---
> void luaL_argcheck (lua_State *L,
6996c7020
< int luaL_argerror (lua_State *L, int arg, const char *extramsg);
---
> int luaL_argerror (lua_State *L, int arg, const char *extramsg);
7015c7039
< void luaL_argexpected (lua_State *L,
---
> void luaL_argexpected (lua_State *L,
7030c7054
< typedef struct luaL_Buffer luaL_Buffer;
---
> typedef struct luaL_Buffer luaL_Buffer;
7102c7126
< char *luaL_buffaddr (luaL_Buffer *B);
---
> char *luaL_buffaddr (luaL_Buffer *B);
7115c7139
< void luaL_buffinit (lua_State *L, luaL_Buffer *B);
---
> void luaL_buffinit (lua_State *L, luaL_Buffer *B);
7129c7153
< size_t luaL_bufflen (luaL_Buffer *B);
---
> size_t luaL_bufflen (luaL_Buffer *B);
7141c7165
< char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz);
---
> char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz);
7153c7177
< void luaL_buffsub (luaL_Buffer *B, int n);
---
> void luaL_buffsub (luaL_Buffer *B, int n);
7166c7190
< int luaL_callmeta (lua_State *L, int obj, const char *e);
---
> int luaL_callmeta (lua_State *L, int obj, const char *e);
7187c7211
< void luaL_checkany (lua_State *L, int arg);
---
> void luaL_checkany (lua_State *L, int arg);
7199c7223
< lua_Integer luaL_checkinteger (lua_State *L, int arg);
---
> lua_Integer luaL_checkinteger (lua_State *L, int arg);
7212c7236
< const char *luaL_checklstring (lua_State *L, int arg, size_t *l);
---
> const char *luaL_checklstring (lua_State *L, int arg, size_t *l);
7231c7255
< lua_Number luaL_checknumber (lua_State *L, int arg);
---
> lua_Number luaL_checknumber (lua_State *L, int arg);
7243c7267
< int luaL_checkoption (lua_State *L,
---
> int luaL_checkoption (lua_State *L,
7274c7298
< void luaL_checkstack (lua_State *L, int sz, const char *msg);
---
> void luaL_checkstack (lua_State *L, int sz, const char *msg);
7288c7312
< const char *luaL_checkstring (lua_State *L, int arg);
---
> const char *luaL_checkstring (lua_State *L, int arg);
7305c7329
< void luaL_checktype (lua_State *L, int arg, int t);
---
> void luaL_checktype (lua_State *L, int arg, int t);
7317c7341
< void *luaL_checkudata (lua_State *L, int arg, const char *tname);
---
> void *luaL_checkudata (lua_State *L, int arg, const char *tname);
7330c7354
< void luaL_checkversion (lua_State *L);
---
> void luaL_checkversion (lua_State *L);
7342c7366
< int luaL_dofile (lua_State *L, const char *filename);
---
> int luaL_dofile (lua_State *L, const char *filename);
7361c7385
< int luaL_dostring (lua_State *L, const char *str);
---
> int luaL_dostring (lua_State *L, const char *str);
7379c7403
< int luaL_error (lua_State *L, const char *fmt, ...);
---
> int luaL_error (lua_State *L, const char *fmt, ...);
7402c7426
< int luaL_execresult (lua_State *L, int stat);
---
> int luaL_execresult (lua_State *L, int stat);
7415c7439
< int luaL_fileresult (lua_State *L, int stat, const char *fname);
---
> int luaL_fileresult (lua_State *L, int stat, const char *fname);
7428c7452
< int luaL_getmetafield (lua_State *L, int obj, const char *e);
---
> int luaL_getmetafield (lua_State *L, int obj, const char *e);
7443c7467
< int luaL_getmetatable (lua_State *L, const char *tname);
---
> int luaL_getmetatable (lua_State *L, const char *tname);
7457c7481
< int luaL_getsubtable (lua_State *L, int idx, const char *fname);
---
> int luaL_getsubtable (lua_State *L, int idx, const char *fname);
7473c7497
< const char *luaL_gsub (lua_State *L,
---
> const char *luaL_gsub (lua_State *L,
7490c7514
< lua_Integer luaL_len (lua_State *L, int index);
---
> lua_Integer luaL_len (lua_State *L, int index);
7505c7529
< int luaL_loadbuffer (lua_State *L,
---
> int luaL_loadbuffer (lua_State *L,
7519c7543
< int luaL_loadbufferx (lua_State *L,
---
> int luaL_loadbufferx (lua_State *L,
7545c7569
< int luaL_loadfile (lua_State *L, const char *filename);
---
> int luaL_loadfile (lua_State *L, const char *filename);
7556c7580
< int luaL_loadfilex (lua_State *L, const char *filename,
---
> int luaL_loadfilex (lua_State *L, const char *filename,
7587c7611
< int luaL_loadstring (lua_State *L, const char *s);
---
> int luaL_loadstring (lua_State *L, const char *s);
7609c7633
< unsigned int luaL_makeseed (lua_State *L);
---
> unsigned int luaL_makeseed (lua_State *L);
7622c7646
< void luaL_newlib (lua_State *L, const luaL_Reg l[]);
---
> void luaL_newlib (lua_State *L, const luaL_Reg l[]);
7644c7668
< void luaL_newlibtable (lua_State *L, const luaL_Reg l[]);
---
> void luaL_newlibtable (lua_State *L, const luaL_Reg l[]);
7665c7689
< int luaL_newmetatable (lua_State *L, const char *tname);
---
> int luaL_newmetatable (lua_State *L, const char *tname);
7682a7707,7716
> 
> Usage note: Beware the use of the return value of this function to
> conditionally initializes the new metatable
> (e.g., by adding metamethods to it).
> If the initialization raises an error,
> the metatable will not be properly initialized,
> but a subsequent execution of that code will detect that the
> metatable already exists and then skip the initialization.
> 
> 
7688c7722
< 
lua_State *luaL_newstate (void);
---
> lua_State *luaL_newstate (void);
7709c7743
< T luaL_opt (L, func, arg, dflt);
---
> T luaL_opt (L, func, arg, dflt);
7730c7764
< lua_Integer luaL_optinteger (lua_State *L,
---
> lua_Integer luaL_optinteger (lua_State *L,
7748c7782
< const char *luaL_optlstring (lua_State *L,
---
> const char *luaL_optlstring (lua_State *L,
7779c7813
< lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d);
---
> lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d);
7794c7828
< const char *luaL_optstring (lua_State *L,
---
> const char *luaL_optstring (lua_State *L,
7811c7845
< char *luaL_prepbuffer (luaL_Buffer *B);
---
> char *luaL_prepbuffer (luaL_Buffer *B);
7823c7857
< char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz);
---
> char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz);
7839c7873
< void luaL_pushfail (lua_State *L);
---
> void luaL_pushfail (lua_State *L);
7850c7884
< void luaL_pushresult (luaL_Buffer *B);
---
> void luaL_pushresult (luaL_Buffer *B);
7862c7896
< void luaL_pushresultsize (luaL_Buffer *B, size_t sz);
---
> void luaL_pushresultsize (luaL_Buffer *B, size_t sz);
7873c7907
< int luaL_ref (lua_State *L, int t);
---
> int luaL_ref (lua_State *L, int t);
7913c7947
< typedef struct luaL_Reg {
---
> typedef struct luaL_Reg {
7932c7966
< void luaL_requiref (lua_State *L, const char *modname,
---
> void luaL_requiref (lua_State *L, const char *modname,
7956c7990
< void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);
---
> void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);
7983c8017
< void luaL_setmetatable (lua_State *L, const char *tname);
---
> void luaL_setmetatable (lua_State *L, const char *tname);
7995c8029
< void *luaL_alloc (void *ud, void *ptr, size_t osize, size_t nsize);
---
> void *luaL_alloc (void *ud, void *ptr, size_t osize, size_t nsize);
8006c8040
< typedef struct luaL_Stream {
---
> typedef struct luaL_Stream {
8045c8079
< void *luaL_testudata (lua_State *L, int arg, const char *tname);
---
> void *luaL_testudata (lua_State *L, int arg, const char *tname);
8058c8092
< const char *luaL_tolstring (lua_State *L, int idx, size_t *len);
---
> const char *luaL_tolstring (lua_State *L, int idx, size_t *len);
8081c8115
< void luaL_traceback (lua_State *L, lua_State *L1, const char *msg,
---
> void luaL_traceback (lua_State *L, lua_State *L1, const char *msg,
8097c8131
< int luaL_typeerror (lua_State *L, int arg, const char *tname);
---
> int luaL_typeerror (lua_State *L, int arg, const char *tname);
8112c8146
< const char *luaL_typename (lua_State *L, int index);
---
> const char *luaL_typename (lua_State *L, int index);
8123c8157
< void luaL_unref (lua_State *L, int t, int ref);
---
> void luaL_unref (lua_State *L, int t, int ref);
8143c8177
< void luaL_where (lua_State *L, int lvl);
---
> void luaL_where (lua_State *L, int lvl);
8258c8292
< void luaL_openlibs (lua_State *L);
---
> void luaL_openlibs (lua_State *L);
8269c8303
< void luaL_openselectedlibs (lua_State *L, int load, int preload);
---
> void luaL_openselectedlibs (lua_State *L, int load, int preload);
8657,8658c8691
< See function next for the caveats of modifying
< the table during its traversal.
---
> See function next for more details about the traversal.
11683a11717,11719
> 
> 
> 
11692a11729,11730
> It is good practice to always require this library explicitly
> before using it.
12308a12347,12351
> 
> 
> 

> The compilation option LUA_COMPAT_GLOBAL (see luaconf.h)
> makes global a regular word.
12438c12481
< 		 global attnamelist | 
---
> 		 global attnamelist [‘=’ explist] | 
12502c12545
< Mon Dec 15 21:02:05 UTC 2025
---
> Fri Jul 24 14:07:32 UTC 2026
12505c12548
< Last change: revised for Lua 5.5.0
---
> Last change: revised for Lua 5.5.1
diff -Nr lua-5.5.0/doc/readme.html lua-5.5.1/doc/readme.html
112c112
< the top-level directory, which is named lua-5.5.0.
---
> the top-level directory, which is named lua-5.5.1.
265a266
> 
 named vararg tables
299c300
< Copyright © 1994–2025 Lua.org, PUC-Rio.
---
> Copyright © 1994–2026 Lua.org, PUC-Rio.
326c327
< Wed Dec 10 11:37:23 UTC 2025
---
> Mon Jul 13 21:20:24 UTC 2026
329c330
< Last change: revised for Lua 5.5.0
---
> Last change: revised for Lua 5.5.1
diff -Nr lua-5.5.0/src/Makefile lua-5.5.1/src/Makefile
33c33
< PLATS= guess aix bsd c89 freebsd generic ios linux macosx mingw posix solaris
---
> PLATS= guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris
125a126,128
> linux-readline:
> 	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX -DLUA_USE_READLINE" SYSLIBS="-Wl,-E -ldl -lreadline"
> 
127c130
< 	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_MACOSX -DLUA_USE_READLINE" SYSLIBS="-lreadline"
---
> 	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_MACOSX" SYSLIBS="-lreadline"
diff -Nr lua-5.5.0/src/lapi.c lua-5.5.1/src/lapi.c
190c190
<       setnilvalue(s2v(L->top.p++));  /* clear new slots */
---
>       setnilvalue2s(L->top.p++);  /* clear new slots */
213c213
<   setnilvalue(s2v(level));
---
>   setnilvalue2s(level);
369c369
< LUA_API unsigned (lua_numbertocstring) (lua_State *L, int idx, char *buff) {
---
> LUA_API unsigned lua_numbertocstring (lua_State *L, int idx, char *buff) {
516c516
<   setnilvalue(s2v(L->top.p));
---
>   setnilvalue2s(L->top.p);
573c573
<     setnilvalue(s2v(L->top.p));
---
>     setnilvalue2s(L->top.p);
746c746
<     setnilvalue(s2v(L->top.p));
---
>     setnilvalue2s(L->top.p);
839c839
<     setnilvalue(s2v(L->top.p));
---
>     setnilvalue2s(L->top.p);
1124a1125
>   luaC_checkGC(L);
1203a1205
>       l_mem newdebt;
1207,1208c1209,1214
<         n = g->GCdebt;  /* force to run one basic step */
<       luaE_setdebt(g, g->GCdebt - n);
---
>         newdebt = 0;  /* force to run one basic step */
>       else if (g->GCdebt >= n - MAX_LMEM)  /* no overflow? */
>         newdebt = g->GCdebt - n;
>       else  /* overflow */
>         newdebt = -MAX_LMEM;  /* set debt to mininum value */
>       luaE_setdebt(g, newdebt);
1296d1301
<   api_checknelems(L, n);
1297a1303
>     api_checkpop(L, n);
1415c1421
<   api_checknelems(L, 1);
---
>   api_checkpop(L, 1);
diff -Nr lua-5.5.0/src/lauxlib.c lua-5.5.1/src/lauxlib.c
515a516,529
> /*
> ** Get/create metatable (MT) for boxes
> */
> static void getBoxMT (lua_State *L) {
>   const char *BOXMT = "_UBOX*"; /* key for the metatable */
>   if (luaL_getmetatable(L, BOXMT) == LUA_TNIL) {  /* MT not created yet? */
>     luaL_newlibtable(L, boxmt);  /* create it */
>     luaL_setfuncs(L, boxmt, 0);  /* initialize it */
>     lua_copy(L, -1, -2);  /* change stack from nil,MT to MT,MT */
>     lua_setfield(L, LUA_REGISTRYINDEX, BOXMT);  /* store MT in the registry */
>   }
> }
> 
> 
520,521c534
<   if (luaL_newmetatable(L, "_UBOX*"))  /* creating metatable? */
<     luaL_setfuncs(L, boxmt, 0);  /* set its metamethods */
---
>   getBoxMT(L);
877c890
<   return luaL_loadbuffer(L, s, strlen(s), s);
---
>   return luaL_loadbufferx(L, s, strlen(s), s, "t");
diff -Nr lua-5.5.0/src/lauxlib.h lua-5.5.1/src/lauxlib.h
84,85c84,85
< LUALIB_API void *luaL_alloc (void *ud, void *ptr, size_t osize,
<                                                   size_t nsize);
---
> LUALIB_API void *(luaL_alloc) (void *ud, void *ptr, size_t osize,
>                                                     size_t nsize);
106c106
< LUALIB_API unsigned luaL_makeseed (lua_State *L);
---
> LUALIB_API unsigned (luaL_makeseed) (lua_State *L);
diff -Nr lua-5.5.0/src/lbaselib.c lua-5.5.1/src/lbaselib.c
343,344c343,345
<   const char *mode = luaL_optstring(L, idx, "bt");
<   if (strchr(mode, 'B') != NULL)  /* Lua code cannot use fixed buffers */
---
>   const char *mode = luaL_optstring(L, idx, NULL);
>   if (mode != NULL && strchr(mode, 'B') != NULL) {
>     /* Lua code cannot use fixed buffers */
345a347
>   }
367,378c369
< ** reserved slot, above all arguments, to hold a copy of the returned
< ** string to avoid it being collected while parsed. 'load' has four
< ** optional arguments (chunk, source name, mode, and environment).
< */
< #define RESERVEDSLOT	5
< 
< 
< /*
< ** Reader for generic 'load' function: 'lua_load' uses the
< ** stack for internal stuff, so the reader cannot change the
< ** stack top. Instead, it keeps its resulting string in a
< ** reserved slot inside the stack.
---
> ** Reader for generic 'load' function.
381c372
<   (void)(ud);  /* not used */
---
>   int *firstcall = cast(int *, ud);
382a374,377
>   if (*firstcall)
>     *firstcall = 0;
>   else
>     lua_pop(L, 1);  /* remove previous result */
386d380
<     lua_pop(L, 1);  /* pop result */
392,393c386
<   lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */
<   return lua_tolstring(L, RESERVEDSLOT, size);
---
>   return lua_tolstring(L, -1, size);
407a401
>     int firstcall = 1;  /* userdata for generic_reader */
410,411c404
<     lua_settop(L, RESERVEDSLOT);  /* create reserved slot */
<     status = lua_load(L, generic_reader, NULL, chunkname, mode);
---
>     status = lua_load(L, generic_reader, &firstcall, chunkname, mode);
428c421
<   if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK))
---
>   if (l_unlikely(luaL_loadfilex(L, fname, "bt") != LUA_OK))
diff -Nr lua-5.5.0/src/lcode.c lua-5.5.1/src/lcode.c
666,667c666,667
<   TValue k, v;
<   setnilvalue(&v);
---
>   lua_State *L = fs->ls->L;
>   TValue k;
669,670c669,670
<   sethvalue(fs->ls->L, &k, fs->kcache);
<   return k2proto(fs, &k, &v);
---
>   sethvalue(L, &k, fs->kcache);
>   return k2proto(fs, &k, &G(L)->nilvalue);
830c830
<       e->u.info = temp;  /* (can't do a direct assignment; values overlap) */
---
>       e->u.info = temp;  /* (avoid a direct assignment; values overlap) */
1368c1368
<     t->u.ind.t = temp;  /* (can't do a direct assignment; values overlap) */
---
>     t->u.ind.t = temp;  /* (avoid a direct assignment; values overlap) */
1376c1376
<     t->u.ind.t = vreg;  /* (avoid a direct assignment; values may overlap) */
---
>     t->u.ind.t = vreg;  /* (avoid a direct assignment; values may overlap?) */
1381c1381,1382
<     t->u.ind.t = cast_byte((t->k == VLOCAL) ? t->u.var.ridx: t->u.info);
---
>     lu_byte temp = cast_byte((t->k == VLOCAL) ? t->u.var.ridx: t->u.info);
>     t->u.ind.t = temp;  /* (avoid a direct assignment; values may overlap?) */
1936,1937d1936
<     /* avoid "not used" warnings when assert is off (for 'onelua.c') */
<     (void)luaP_isOT; (void)luaP_isIT;
diff -Nr lua-5.5.0/src/ldblib.c lua-5.5.1/src/ldblib.c
430c430
<     if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
---
>     if (luaL_loadbufferx(L, buffer, strlen(buffer), "=(debug command)", "t") ||
diff -Nr lua-5.5.0/src/ldebug.c lua-5.5.1/src/ldebug.c
294c294
<     setnilvalue(s2v(L->top.p));
---
>     setnilvalue2s(L->top.p);
583c583
<       case OP_GETTABLE: {
---
>       case OP_GETTABLE: case OP_GETVARG: {
diff -Nr lua-5.5.0/src/ldo.c lua-5.5.1/src/ldo.c
224,226c224,226
< ** Check whether stack has enough space to run a simple function (such
< ** as a finalizer): At least BASIC_STACK_SIZE in the Lua stack and
< ** 2 slots in the C stack.
---
> ** Check whether stacks have enough space to run a simple function (such
> ** as a finalizer): At least BASIC_STACK_SIZE in the Lua stack, two
> ** available CallInfos, and two "slots" in the C stack.
229,230c229,238
<   return ((stacksize(L) < MAXSTACK - BASIC_STACK_SIZE) &&
<           (getCcalls(L) < LUAI_MAXCCALLS - 2));
---
>   if (getCcalls(L) >= LUAI_MAXCCALLS - 2)
>     return 0;  /* not enough C-stack slots */
>   if (L->ci->next == NULL && luaE_extendCI(L, 0) == NULL)
>     return 0;  /* unable to allocate first ci */
>   if (L->ci->next->next == NULL && luaE_extendCI(L, 0) == NULL)
>     return 0;  /* unable to allocate second ci */
>   if (L->stack_last.p - L->top.p >= BASIC_STACK_SIZE)
>     return 1;  /* enough (BASIC_STACK_SIZE) free slots in the Lua stack */
>   else  /* try to grow stack to a size with enough free slots */
>     return luaD_growstack(L, BASIC_STACK_SIZE, 0);
344c352
<     setnilvalue(s2v(newstack + i)); /* erase new segment */
---
>     setnilvalue2s(newstack + i); /* erase new segment */
425,430d432
< 
< void luaD_inctop (lua_State *L) {
<   L->top.p++;
<   luaD_checkstack(L, 1);
< }
< 
549c551
<     setnilvalue(s2v(res + i));
---
>     setnilvalue2s(res + i);
569c571
<         setnilvalue(s2v(res));  /* adjust with nil */
---
>         setnilvalue2s(res);  /* adjust with nil */
619c621
< #define next_ci(L)  (L->ci->next ? L->ci->next : luaE_extendCI(L))
---
> #define next_ci(L)  (L->ci->next ? L->ci->next : luaE_extendCI(L, 1))
689c691
<         setnilvalue(s2v(func + narg1));  /* complete missing arguments */
---
>         setnilvalue2s(func + narg1);  /* complete missing arguments */
736c738
<         setnilvalue(s2v(L->top.p++));  /* complete missing arguments */
---
>         setnilvalue2s(L->top.p++);  /* complete missing arguments */
1122a1125,1128
> /*
> ** Before the first call to the reader function, Lua reserves a slot
> ** with a table for anchoring stuff.
> */
1127c1133,1139
<   int c = zgetc(p->z);  /* read first character */
---
>   int c;
>   Table *anchor;
>   ptrdiff_t otop = savestack(L, L->top.p);  /* original top */
>   luaD_checkstack(L, 2);
>   anchor = luaH_new(L);  /* create the anchor table */
>   sethvalue2s(L, L->top.p++, anchor);  /* anchor the anchor table */
>   c = zgetc(p->z);  /* read first character */
1134c1146
<     cl = luaU_undump(L, p->z, p->name, fixed);
---
>     cl = luaU_undump(L, p->z, anchor, p->name, fixed);
1138c1150
<     cl = luaY_parser(L, p->z, &p->buff, &p->dyd, p->name, c);
---
>     cl = luaY_parser(L, p->z, anchor, &p->buff, &p->dyd, p->name, c);
1139a1152,1153
>   L->top.p = restorestack(L, otop);  /* restore stack */
>   setclLvalue2s(L, L->top.p++, cl);  /* push closure */
1141a1156,1169
> }
> 
> 
> /*
> ** Anchor an object in a table in the stack.  First, anchor the object
> ** temporarily in the stack, as luaH_set may call an emergency GC.
> ** Then, add it in the table with itself as its key.
> */
> void luaD_anchorobj (lua_State *L, Table *anchor, GCObject *obj) {
>   setgcovalue(L, s2v(L->top.p++), obj);  /* temporary anchor in the stack */
>   luaH_set(L, anchor, s2v(L->top.p - 1), s2v(L->top.p - 1));
>   /* Because this is a new key, luaH_set will call the GC barrier, so
>      we don't need to call the barrier again here */
>   L->top.p--;
diff -Nr lua-5.5.0/src/ldo.h lua-5.5.1/src/ldo.h
91d90
< LUAI_FUNC void luaD_inctop (lua_State *L);
92a92
> LUAI_FUNC void luaD_anchorobj (lua_State *L, Table *anchor, GCObject *obj);
diff -Nr lua-5.5.0/src/lgc.c lua-5.5.1/src/lgc.c
712c712
<       setnilvalue(s2v(o));  /* clear dead stack slice */
---
>       setnilvalue2s(o);  /* clear dead stack slice */
1296c1296
<   if (!g->gcemergency && luaD_checkminstack(L))
---
>   if (g->tobefnz != NULL && !g->gcemergency && luaD_checkminstack(L))
1675c1675
<       else {  /* no more finalizers or emergency mode or no enough stack
---
>       else {  /* no more finalizers or emergency mode or not enough stack
diff -Nr lua-5.5.0/src/llex.c lua-5.5.1/src/llex.c
191c191
< #if defined(LUA_COMPAT_GLOBAL)
---
> #if LUA_COMPAT_GLOBAL
diff -Nr lua-5.5.0/src/llimits.h lua-5.5.1/src/llimits.h
237c237
< #define luai_numidiv(L,a,b)     ((void)L, l_floor(luai_numdiv(L,a,b)))
---
> #define luai_numidiv(L,a,b)     l_floor(luai_numdiv(L,a,b))
242c242
< #define luai_numdiv(L,a,b)      ((a)/(b))
---
> #define luai_numdiv(L,a,b)      ((void)L, (a)/(b))
270,273c270,273
< #define luai_numadd(L,a,b)      ((a)+(b))
< #define luai_numsub(L,a,b)      ((a)-(b))
< #define luai_nummul(L,a,b)      ((a)*(b))
< #define luai_numunm(L,a)        (-(a))
---
> #define luai_numadd(L,a,b)      ((void)L, (a)+(b))
> #define luai_numsub(L,a,b)      ((void)L, (a)-(b))
> #define luai_nummul(L,a,b)      ((void)L, (a)*(b))
> #define luai_numunm(L,a)        ((void)L, -(a))
diff -Nr lua-5.5.0/src/loadlib.c lua-5.5.1/src/loadlib.c
544c544
<   return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);
---
>   return checkload(L, (luaL_loadfilex(L, filename, "bt") == LUA_OK), filename);
diff -Nr lua-5.5.0/src/lobject.h lua-5.5.1/src/lobject.h
211c211,212
< #define setnilvalue(obj) settt_(obj, LUA_VNIL)
---
> #define setnilvalue(obj)	settt_(obj, LUA_VNIL)
> #define setnilvalue2s(stk)	setnilvalue(s2v(stk))
diff -Nr lua-5.5.0/src/lopcodes.c lua-5.5.1/src/lopcodes.c
107c107
<  ,opmode(0, 0, 1, 0, 1, iABC)		/* OP_VARARGPREP */
---
>  ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_VARARGPREP */
112,124c112
< 
< /*
< ** Check whether instruction sets top for next instruction, that is,
< ** it results in multiple values.
< */
< int luaP_isOT (Instruction i) {
<   OpCode op = GET_OPCODE(i);
<   switch (op) {
<     case OP_TAILCALL: return 1;
<     default:
<       return testOTMode(op) && GETARG_C(i) == 0;
<   }
< }
---
> #define testITMode(m)	(luaP_opmodes[m] & (1 << 5))
128,129c116,118
< ** Check whether instruction uses top from previous instruction, that is,
< ** it accepts multiple results.
---
> ** Check whether instruction uses top. That happens for OP_VARARGPREP
> ** and for instructions that use multiple values set by the previous
> ** instruction.
135c124,126
<       return testITMode(GET_OPCODE(i)) && GETARG_vB(i) == 0;
---
>       return GETARG_vB(i) == 0;
>     case OP_VARARGPREP:
>       return 1;
diff -Nr lua-5.5.0/src/lopcodes.h lua-5.5.1/src/lopcodes.h
420,421c420,421
< ** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0)
< ** bit 6: instruction sets 'L->top' for next instruction (when C == 0)
---
> ** bit 5: used by 'luaP_isIT'
> ** bit 6: used by 'luaP_isOT'
430,431d429
< #define testITMode(m)	(luaP_opmodes[m] & (1 << 5))
< #define testOTMode(m)	(luaP_opmodes[m] & (1 << 6))
435c433,440
< LUAI_FUNC int luaP_isOT (Instruction i);
---
> /* Check whether instruction sets top for next instruction, that is,
> ** it results in multiple values. Used only for tests.
> */
> #define luaP_isOT(i)  \
> 	(GET_OPCODE(i) == OP_TAILCALL || \
> 	 ((luaP_opmodes[GET_OPCODE(i)] & (1 << 6)) && GETARG_C(i) == 0))
> 
> 
diff -Nr lua-5.5.0/src/lparser.c lua-5.5.1/src/lparser.c
824,825c824
<   sethvalue2s(L, L->top.p, fs->kcache);  /* anchor it */
<   luaD_inctop(L);
---
>   luaD_anchorobj(L, ls->h, obj2gco(fs->kcache));  /* anchor it */
833a833
>   TValue temp;
845a846,848
>   /* remove kcache table from scanner table ("weigh" its anchor) */
>   sethvalue(L, &temp, fs->kcache);  /* key to be set to nil */
>   luaH_set(L, ls->h, &temp, &G(L)->nilvalue);
847d849
<   L->top.p--;  /* pop kcache table */
1166a1169
>       return;  /* to avoid warnings */
1614d1616
<   leaveblock(fs);  /* finish scope */
1622a1625
>   leaveblock(fs);  /* finish scope */
2114c2117
< #if defined(LUA_COMPAT_GLOBAL)
---
> #if LUA_COMPAT_GLOBAL
2168c2171
< LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
---
> LClosure *luaY_parser (lua_State *L, ZIO *z, Table *anchor, Mbuffer *buff,
2172,2177c2175,2178
<   LClosure *cl = luaF_newLclosure(L, 1);  /* create main closure */
<   setclLvalue2s(L, L->top.p, cl);  /* anchor it (to avoid being collected) */
<   luaD_inctop(L);
<   lexstate.h = luaH_new(L);  /* create table for scanner */
<   sethvalue2s(L, L->top.p, lexstate.h);  /* anchor it */
<   luaD_inctop(L);
---
>   LClosure *cl;
>   lexstate.h = anchor;  /* table for scanner */
>   cl = luaF_newLclosure(L, 1);  /* create main closure */
>   luaD_anchorobj(L, anchor, obj2gco(cl));  /* anchor it in scanner table */
2190,2191c2191
<   L->top.p--;  /* remove scanner's table */
<   return cl;  /* closure is on the stack, too */
---
>   return cl;
diff -Nr lua-5.5.0/src/lparser.h lua-5.5.1/src/lparser.h
192,193c192,194
< LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
<                                  Dyndata *dyd, const char *name, int firstchar);
---
> LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Table *anchor,
>                                  Mbuffer *buff, Dyndata *dyd,
>                                  const char *name, int firstchar);
diff -Nr lua-5.5.0/src/lstate.c lua-5.5.1/src/lstate.c
71c71
< CallInfo *luaE_extendCI (lua_State *L) {
---
> CallInfo *luaE_extendCI (lua_State *L, int err) {
73,76c73,79
<   lua_assert(L->ci->next == NULL);
<   ci = luaM_new(L, CallInfo);
<   lua_assert(L->ci->next == NULL);
<   L->ci->next = ci;
---
>   ci = luaM_reallocvector(L, NULL, 0, 1, CallInfo);
>   if (l_unlikely(ci == NULL)) {  /* allocation failed? */
>     if (err)
>       luaM_error(L);  /* raise the error */
>     return NULL;  /* else only report it */
>   }
>   ci->next = L->ci->next;
78c81,83
<   ci->next = NULL;
---
>   L->ci->next = ci;
>   if (ci->next)
>     ci->next->previous = ci;
149c154
<   setnilvalue(s2v(ci->func.p));  /* 'function' entry for basic 'ci' */
---
>   setnilvalue2s(ci->func.p);  /* 'function' entry for basic 'ci' */
164c169
<     setnilvalue(s2v(L1->stack.p + i));  /* erase new stack */
---
>     setnilvalue2s(L1->stack.p + i);  /* erase new stack */
diff -Nr lua-5.5.0/src/lstate.h lua-5.5.1/src/lstate.h
386c386
< ** Union of all collectable objects (only for conversions)
---
> ** Union of all collectable objects
406,409c406,412
< /*
< ** ISO C99, 6.7.2.1 p.14:
< ** "A pointer to a union object, suitably converted, points to each of
< ** its members [...], and vice versa."
---
> /* macros to convert a GCObject into a specific value
> ** ISO C99, 6.3.2.2 p.7:
> ** "A pointer to an object or incomplete type may be converted to a
> ** pointer to a different object or incomplete type. If the resulting
> ** pointer is not correctly aligned for the pointed-to type, the
> ** behavior is undefined. Otherwise, when converted back again, the
> ** result shall compare equal to the original pointer."
411,424c414,424
< #define cast_u(o)	cast(union GCUnion *, (o))
< 
< /* macros to convert a GCObject into a specific value */
< #define gco2ts(o)  \
< 	check_exp(novariant((o)->tt) == LUA_TSTRING, &((cast_u(o))->ts))
< #define gco2u(o)  check_exp((o)->tt == LUA_VUSERDATA, &((cast_u(o))->u))
< #define gco2lcl(o)  check_exp((o)->tt == LUA_VLCL, &((cast_u(o))->cl.l))
< #define gco2ccl(o)  check_exp((o)->tt == LUA_VCCL, &((cast_u(o))->cl.c))
< #define gco2cl(o)  \
< 	check_exp(novariant((o)->tt) == LUA_TFUNCTION, &((cast_u(o))->cl))
< #define gco2t(o)  check_exp((o)->tt == LUA_VTABLE, &((cast_u(o))->h))
< #define gco2p(o)  check_exp((o)->tt == LUA_VPROTO, &((cast_u(o))->p))
< #define gco2th(o)  check_exp((o)->tt == LUA_VTHREAD, &((cast_u(o))->th))
< #define gco2upv(o)	check_exp((o)->tt == LUA_VUPVAL, &((cast_u(o))->upv))
---
> #define gco2(v,T,o)	check_exp((o)->tt == v, cast(T*, o))
> #define gco2nv(t,T,o)	check_exp(novariant((o)->tt) == t, cast(T*, o))
> #define gco2ts(o)	gco2nv(LUA_TSTRING, TString, o)
> #define gco2u(o)	gco2(LUA_VUSERDATA, Udata, o)
> #define gco2lcl(o)	(&gco2(LUA_VLCL, Closure, o)->l)
> #define gco2ccl(o)	(&gco2(LUA_VCCL, Closure, o)->c)
> #define gco2cl(o)	gco2nv(LUA_TFUNCTION, Closure, o)
> #define gco2t(o)	gco2(LUA_VTABLE, Table, o)
> #define gco2p(o)	gco2(LUA_VPROTO, Proto, o)
> #define gco2th(o)	gco2(LUA_VTHREAD, lua_State, o)
> #define gco2upv(o)	gco2(LUA_VUPVAL, UpVal, o)
431c431
< 	check_exp(novariant((v)->tt) >= LUA_TSTRING, &(cast_u(v)->gc))
---
> 	check_exp(novariant((v)->tt) >= LUA_TSTRING, cast(GCObject*, v))
441c441
< LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);
---
> LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L, int err);
diff -Nr lua-5.5.0/src/lstrlib.c lua-5.5.1/src/lstrlib.c
144,145c144,145
<   if (n <= 0)
<     lua_pushliteral(L, "");
---
>   if (n <= 0 || (len | lsep) == 0)
>     lua_pushliteral(L, "");  /* no repetitions or both strings empty */
759a760,762
> /*
> ** Prepare state for matches. These fields are not affected by each match.
> */
763d765
<   ms->matchdepth = MAXCCALLS;
769a772,775
> /*
> ** (Re)prepare state for a match, setting fields that change during
> ** each match.
> */
770a777
>   ms->matchdepth = MAXCCALLS;
772d778
<   lua_assert(ms->matchdepth == MAXCCALLS);
971c977
<       changed = add_value(&ms, &b, src, e, tr) | changed;
---
>       changed = add_value(&ms, &b, src, e, tr) || changed;
1729c1735
<     luaL_argcheck(L, totalsize <= LUA_MAXINTEGER - size,
---
>     luaL_argcheck(L, totalsize <= MAX_SIZE - size,
diff -Nr lua-5.5.0/src/ltable.c lua-5.5.1/src/ltable.c
654,657c654,656
< ** Exchange the hash part of 't1' and 't2'. (In 'flags', only the
< ** dummy bit must be exchanged: The 'isrealasize' is not related
< ** to the hash part, and the metamethod bits do not change during
< ** a resize, so the "real" table can keep their values.)
---
> ** Exchange the hash part of 't1' and 't2'. (In 'flags', only the dummy
> ** bit must be exchanged:  The metamethod bits do not change during a
> ** resize, so the "real" table can keep their values.)
1158a1158
>     const TValue *actk = key;  /* actual key to insert */
1164,1166c1164,1166
<       if (luaV_flttointeger(f, &k, F2Ieq)) {
<         setivalue(&aux, k);  /* key is equal to an integer */
<         key = &aux;  /* insert it as an integer */
---
>       if (luaV_flttointeger(f, &k, F2Ieq)) {  /* is key equal to an integer? */
>         setivalue(&aux, k);
>         actk = &aux;  /* use the integer as the key */
1179c1179
<     luaH_newkey(L, t, key, value);
---
>     luaH_newkey(L, t, actk, value);
diff -Nr lua-5.5.0/src/ltablib.c lua-5.5.1/src/ltablib.c
45c45
< ** has a metatable with the required metamethods)
---
> ** has a metatable with the required metamethods).
48c48,49
<   if (lua_type(L, arg) != LUA_TTABLE) {  /* is it not a table? */
---
>   int tp = lua_type(L, arg);
>   if (tp != LUA_TTABLE) {  /* is it not a table? */
53c54,55
<         (!(what & TAB_L) || checkfield(L, "__len", ++n))) {
---
>         (!(what & TAB_L) ||  /* strings don't need '__len' to have a length */
>              tp == LUA_TSTRING || checkfield(L, "__len", ++n))) {
206a209
>   lua_Integer len = aux_getn(L, 1, TAB_R);
208c211
<   lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1));
---
>   lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, len);
diff -Nr lua-5.5.0/src/ltm.c lua-5.5.1/src/ltm.c
265c265
<     setnilvalue(s2v(ci->func.p + i));  /* erase original parameter (for GC) */
---
>     setnilvalue2s(ci->func.p + i);  /* erase original parameter (for GC) */
286c286
<     setnilvalue(s2v(ci->func.p + nfixparams + 1));
---
>     setnilvalue2s(ci->func.p + nfixparams + 1);
310c310
<   setnilvalue(s2v(ra));  /* else produce nil */
---
>   setnilvalue2s(ra);  /* else produce nil */
358c358
<        setnilvalue(s2v(where + i));
---
>        setnilvalue2s(where + i);
362c362
<     setnilvalue(s2v(where + i));
---
>     setnilvalue2s(where + i);
diff -Nr lua-5.5.0/src/ltm.h lua-5.5.1/src/ltm.h
52c52
< ** the table is using the dummy node; bit 7 is used for 'isrealasize'.)
---
> ** the table is using the dummy node.)
diff -Nr lua-5.5.0/src/lua.c lua-5.5.1/src/lua.c
32a33,38
> /* Name of the environment variable with the name of the readline library */
> #if !defined(LUA_RLLIB_VAR)
> #define LUA_RLLIB_VAR		"LUA_READLINELIB"
> #endif
> 
> 
204c210
<   return dochunk(L, luaL_loadfile(L, name));
---
>   return dochunk(L, luaL_loadfilex(L, name, "bt"));
209c215
<   return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
---
>   return dochunk(L, luaL_loadbufferx(L, s, strlen(s), name, "t"));
263c269
<   status = luaL_loadfile(L, fname);
---
>   status = luaL_loadfilex(L, fname, "bt");
376a383,391
> static char *(*l_getenv)(const char *name);
> 
> /* Function to ignore environment variables, used by option -E */
> static char *no_getenv (const char *name) {
>   UNUSED(name);
>   return NULL;
> }
> 
> 
379c394
<   const char *init = getenv(name + 1);
---
>   const char *init = l_getenv(name + 1);
382c397
<     init = getenv(name + 1);  /* try alternative name */
---
>     init = l_getenv(name + 1);  /* try alternative name */
501,504c516,521
<   void *lib = dlopen(LUA_READLINELIB, RTLD_NOW | RTLD_LOCAL);
<   if (lib == NULL)
<     lua_warning(L, "library '" LUA_READLINELIB "' not found", 0);
<   else {
---
>   const char *rllib = l_getenv(LUA_RLLIB_VAR);  /* name of readline library */
>   void *lib;  /* library handle */
>   if (rllib == NULL)  /* no environment variable? */
>     rllib = LUA_READLINELIB;  /* use default name */
>   lib = dlopen(rllib, RTLD_NOW | RTLD_LOCAL);
>   if (lib != NULL) {
510,512c527,533
<     if (l_readline == NULL)
<       lua_warning(L, "unable to load 'readline'", 0);
<   }
---
>     if (l_readline != NULL)  /* could load readline function? */
>       return;  /* everything ok */
>     /* else emit a warning */
>   }
>   lua_warning(L, "unable to load readline library '", 1);
>   lua_warning(L, rllib, 1);
>   lua_warning(L, "'", 0);
591c612
<   int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin");
---
>   int status = luaL_loadbufferx(L, retline, strlen(retline), "=stdin", "t");
595c616
<     lua_pop(L, 2);  /* pop result from 'luaL_loadbuffer' and modified line */
---
>     lua_pop(L, 2);  /* pop result from 'luaL_loadbufferx' and modified line */
622c643
<     int status = luaL_loadbuffer(L, line, len, "=stdin");  /* try it */
---
>     int status = luaL_loadbufferx(L, line, len, "=stdin", "t");  /* try it */
696c717,723
< #define luai_openlibs(L)	luaL_openselectedlibs(L, ~0, 0)
---
> #if defined(LUA_NODEBUGLIB)
> /* With this option, code must require the debug library before using it */
> #define luai_openlibs(L)  luaL_openselectedlibs(L, ~LUA_DBLIBK, LUA_DBLIBK)
> #else
> /* The default is to open all standard libraries */
> #define luai_openlibs(L)  luaL_openselectedlibs(L, ~0, 0)
> #endif
717a745
>     l_getenv = &no_getenv;  /* program will ignore environment variables */
720a749,750
>   else
>     l_getenv = &getenv;
725,728c755,756
<   if (!(args & has_E)) {  /* no option '-E'? */
<     if (handle_luainit(L) != LUA_OK)  /* run LUA_INIT */
<       return 0;  /* error running LUA_INIT */
<   }
---
>   if (handle_luainit(L) != LUA_OK)  /* run LUA_INIT */
>     return 0;  /* error running LUA_INIT */
diff -Nr lua-5.5.0/src/lua.h lua-5.5.1/src/lua.h
16c16
< #define LUA_COPYRIGHT	LUA_RELEASE "  Copyright (C) 1994-2025 Lua.org, PUC-Rio"
---
> #define LUA_COPYRIGHT	LUA_RELEASE "  Copyright (C) 1994-2026 Lua.org, PUC-Rio"
22c22
< #define LUA_VERSION_RELEASE_N	0
---
> #define LUA_VERSION_RELEASE_N	1
524c524
< * Copyright (C) 1994-2025 Lua.org, PUC-Rio.
---
> * Copyright (C) 1994-2026 Lua.org, PUC-Rio.
diff -Nr lua-5.5.0/src/luaconf.h lua-5.5.1/src/luaconf.h
72a73
> #if !defined(LUA_READLINELIB)
74a76
> #endif
80c82
< #define LUA_READLINELIB		"libedit.dylib"
---
> #define LUA_USE_READLINE	/* needs an extra library: -lreadline */
227,229c229,231
< 		LUA_LDIR"?.lua;"  LUA_LDIR"?\\init.lua;" \
< 		LUA_CDIR"?.lua;"  LUA_CDIR"?\\init.lua;" \
< 		LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \
---
> 		LUA_LDIR "?.lua;"  LUA_LDIR "?\\init.lua;" \
> 		LUA_CDIR "?.lua;"  LUA_CDIR "?\\init.lua;" \
> 		LUA_SHRDIR "?.lua;"  LUA_SHRDIR "?\\init.lua;" \
235,237c237,239
< 		LUA_CDIR"?.dll;" \
< 		LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \
< 		LUA_CDIR"loadall.dll;" ".\\?.dll"
---
> 		LUA_CDIR "?.dll;" \
> 		LUA_CDIR "..\\lib\\lua\\"  LUA_VDIR "\\?.dll;" \
> 		LUA_CDIR "loadall.dll;" ".\\?.dll"
248,249c250,251
< 		LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \
< 		LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua;" \
---
> 		LUA_LDIR "?.lua;"  LUA_LDIR "?/init.lua;" \
> 		LUA_CDIR "?.lua;"  LUA_CDIR "?/init.lua;" \
255c257
< 		LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"
---
> 		LUA_CDIR "?.so;" LUA_CDIR "loadall.so;" "./?.so"
342c344,346
< #define LUA_COMPAT_GLOBAL
---
> #if !defined(LUA_COMPAT_GLOBAL)
> #define LUA_COMPAT_GLOBAL	1
> #endif
652c656
< #if defined(__GNUC__) && !defined(LUA_NOBUILTIN)
---
> #if !defined(LUA_NOBUILTIN) && defined(__GNUC__) && (__GNUC__ >= 3)
724,725c728,730
< @@ LUAI_MAXALIGN defines fields that, when used in a union, ensure
< ** maximum alignment for the other items in that union.
---
> @@ LUAI_MAXALIGN defines fields that ensure proper alignment for
> ** memory areas offered by Lua (e.g., userdata memory).
> ** Add fields to it if you need alignment for non-ISO objects.
726a732,736
> #if defined(LLONG_MAX)
> /* use ISO C99 stuff */
> #define LUAI_MAXALIGN long double u; void *s; long long l
> #else
> /* use only C89 stuff */
727a738
> #endif
diff -Nr lua-5.5.0/src/lundump.c lua-5.5.1/src/lundump.c
395c395,396
< LClosure *luaU_undump (lua_State *L, ZIO *Z, const char *name, int fixed) {
---
> LClosure *luaU_undump (lua_State *L, ZIO *Z, Table *anchor, const char *name,
>                        int fixed) {
408,411c409
<   cl = luaF_newLclosure(L, loadByte(&S));
<   setclLvalue2s(L, L->top.p, cl);
<   luaD_inctop(L);
<   S.h = luaH_new(L);  /* create list of saved strings */
---
>   S.h = anchor;
413,414c411,412
<   sethvalue2s(L, L->top.p, S.h);  /* anchor it */
<   luaD_inctop(L);
---
>   cl = luaF_newLclosure(L, loadByte(&S));
>   luaD_anchorobj(L, anchor, obj2gco(cl));
421d418
<   L->top.p--;  /* pop table */
diff -Nr lua-5.5.0/src/lundump.h lua-5.5.1/src/lundump.h
33,34c33,34
< LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, const char* name,
<                                                int fixed);
---
> LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, Table *anchor,
>                                  const char* name, int fixed);
diff -Nr lua-5.5.0/src/lutf8lib.c lua-5.5.1/src/lutf8lib.c
58a59,60
>   else if (c >= 0xfe)  /* c >= 1111 1110b ? */
>     return NULL;  /* would need six or more continuation bytes */
66a69
>     lua_assert(count <= 5);
68c71
<     if (count > 5 || res > MAXUTF || res < limits[count])
---
>     if (res > MAXUTF || res < limits[count])
149c152
<   lua_pushfstring(L, "%U", (long)code);
---
>   lua_pushfstring(L, "%U", cast(unsigned long, code));
diff -Nr lua-5.5.0/src/lvm.c lua-5.5.1/src/lvm.c
271c271
< ** written online with opcode OP_FORLOOP, for performance.)
---
> ** written inline with opcode OP_FORLOOP, for performance.)
273c273
< static int floatforloop (StkId ra) {
---
> static int floatforloop (lua_State *L, StkId ra) {
306c306
<         setnilvalue(s2v(val));  /* result is nil */
---
>         setnilvalue2s(val);  /* result is nil */
363,367c363,373
<     t = tm;  /* else repeat assignment over 'tm' */
<     luaV_fastset(t, key, val, hres, luaH_pset);
<     if (hres == HOK) {
<       luaV_finishfastset(L, t, val);
<       return;  /* done */
---
>     t = tm;  /* else must repeat assignment over 'tm' */
>     /* do the equivalent to 'luaV_fastset', but saving 'h' */
>     if (!ttistable(t))
>       hres = HNOTATABLE;
>     else {
>       Table *h = hvalue(t);  /* next call can change the value at 't' */
>       hres = luaH_pset(h, key, val);
>       if (hres == HOK) {
>         luaC_barrierback(L, obj2gco(h), val);  /* luaV_finishfastset */
>         return;  /* done */
>       }
369c375
<     /* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */
---
>     /* else 'return luaV_finishset(L, t, key, val, hres)' (loop) */
922c928
< ** iterpreter loop (function luaV_execute) and may access directly
---
> ** interpreter loop (function luaV_execute) and may access directly
1844c1850
<         else if (floatforloop(ra))  /* float loop */
---
>         else if (floatforloop(L, ra))  /* float loop */