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> /* avoid strlen call or inline */
> lua_pushlstring(L, "cannot close standard file", sizeof("cannot close standard file") - 1);

I suggest you use lua_pushliteral for string literals; it's good documentation.

lua_pushliteral is currently defined as lua_pushstring but in Lua 5.2
and previous versions it was defined as
#define lua_pushliteral(L, s)  lua_pushlstring(L, "" s,

You may want to redefine lua_pushliteral back to this if you are
worried about strlen on literals.