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 For literal strings, lua_pushstring is both simpler to use and faster. 
lua_pushstring(L, "cannot close standard file");
Can be simpler, but it is not faster than:

/* avoid strlen call or inline */
lua_pushlstring(L, "cannot close standard file", sizeof("cannot close standard file") - 1);
Compilers nowadays won't call strlen for string literals:

Don't assume, test, measure, look at the compiler's output.

Andre Leiradella