MAXARG_Bx
lua_assert(a <= MAXARG_A && bc <= MAXARG_Bx);
if (k <= MAXARG_Bx)
#define MAXARG_sBx (MAXARG_Bx>>1) /* `sBx' is signed */
luaM_growvector(L, f->p, fs->np, f->sizep, Proto *, MAXARG_Bx, "functions");