Towards "to closed" local variables

Start of the implementation of "scoped variables" or "to be closed"
variables, local variables whose '__close' (or themselves) are called
when they go out of scope. This commit implements the syntax, the
opcode, and the creation of the corresponding upvalue, but it still
does not call the finalizations when the variable goes out of scope
(the most important part).

Currently, the syntax is 'local scoped name = exp', but that will
probably change.

1 files changed, 2 insertions, 2 deletions

diff --git a/lcode.c b/lcode.c
index d00038dd..e84b85ac 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1673,13 +1673,13 @@ void luaK_finish (FuncState *fs) {
     lua_assert(i == 0 || isOT(*(pc - 1)) == isIT(*pc));
     switch (GET_OPCODE(*pc)) {
       case OP_RETURN0: case OP_RETURN1: {
-        if (p->sizep == 0 && !p->is_vararg)
+        if (!(fs->needclose || p->is_vararg))
           break;  /* no extra work */
         /* else use OP_RETURN to do the extra work */
         SET_OPCODE(*pc, OP_RETURN);
       }  /* FALLTHROUGH */
       case OP_RETURN: case OP_TAILCALL: {
-        if (p->sizep > 0 || p->is_vararg) {
+        if (fs->needclose || p->is_vararg) {
           SETARG_C(*pc, p->is_vararg ? p->numparams + 1 : 0);
           SETARG_k(*pc, 1);  /* signal that there is extra work */
         }