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, 1 insertions, 0 deletions

diff --git a/lparser.h b/lparser.h
index e158c9d9..1b94a97a 100644
--- a/lparser.h
+++ b/lparser.h
@@ -133,6 +133,7 @@ typedef struct FuncState {
   lu_byte nups;  /* number of upvalues */
   lu_byte freereg;  /* first free register */
   lu_byte iwthabs;  /* instructions issued since last absolute line info */
+  lu_byte needclose;  /* function needs to close upvalues when returning */
 } FuncState;