Lua 5.1 Reference Manual – errata

Inserted text, deleted text, and corrected text have been marked in color.

• page 16, section 2.5:
  Vararg expressions, denoted by three dots ('...'), can only be used when directly inside a vararg function;
• page 18, section 2.8:
  Tables and full userdata have individual metatables (although multiple tables and userdata can share a same table as their metatables); values of all other types share one single metatable per type. So, there is one single metatable for all numbers, one for all strings, etc.
• page 25, section 2.10.1:
  That is, the first finalizer to be called is the one associated with the userdata created last in the program. The userdata itself is freed only in the next garbage-collection cycle.
• page 25, section 2.10.2:
  The weakness of a table is controlled by the value of the __mode field of its metatable.
• page 30, section 3.6:
  Most functions in the API may throw an error, for instance due to a memory allocation error. The documentation for each function indicates whether it can throw errors.
• page 34, section 3.7, lua_gc entry:
  LUA_GCSETSTEPMUL: sets data/100 as the new value for the step multiplier ...
• page 36, section 3.7, lua_Integer entry:
  ... which is usually the largest signed integral type the machine handles "comfortably".
• page 37, section 3.7, before lua_isnumber entry:

  ---

  lua_isnone

  int lua_isnone (lua_State *L, int index);

  Returns 1 if the given acceptable index is not valid (that is, it refers to an element outside the current stack), and 0 otherwise.

  ---

  lua_isnoneornil

  int lua_isnoneornil (lua_State *L, int index);

  Returns 1 if the given acceptable index is not valid (that is, it refers to an element outside the current stack) or if the value at this index is nil, and 0 otherwise.

• page 40, section 3.7, lua_pcall entry:
  int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc);
• page 48, section 3.7, lua_Writer entry:
  The type of the writer function used by lua_dump.
• page 59, section 4.1, luaL_checktype entry:
  Checks whether the function argument narg has type t. See lua_type for the encoding of types for t.
• page 67, section 5.1, getfenv entry:

  getfenv ([f])

• page 75, section 5.4, string.format entry:
  This function does not accept string values containing embedded zeros, except as arguments to the q option.
• page 75, section 5.4, string.gmatch entry:
  For this function, a '^' at the start of a pattern does not work as an anchor, as this would prevent the iteration.
• page 76, section 5.4, string.gsub entry:
  x = string.gsub("$name-$%version.tar.gz", "%$(%w+)", t)
• page 79, section 5.5, table.concat entry:
  Given an array where all elements are strings or numbers, returns ...
• page 83, section 5.7, introduction:
  (plus an error message as a second result and a system-dependent error code as a third result)
• page 86, section 5.7, file:setvbuf entry:
  For the last two cases, size specifies the size of the buffer, in bytes.
• page 87, section 5.8, os.setlocale entry:
  If locale is the empty string, the current locale is set to an implementation-defined native locale. If locale is the string "C", the current locale is set to the standard C locale.