From 4df11f3c6f9a7835fc513ec27c85e7541c58e232 Mon Sep 17 00:00:00 2001
From: blueloveTH <blueloveth@foxmail.com>
Date: Wed, 18 Dec 2024 19:29:39 +0800
Subject: [PATCH] support empty tuple `()`

---
 src/compiler/compiler.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/compiler/compiler.c b/src/compiler/compiler.c
index 7ef73957..71bf9318 100644
--- a/src/compiler/compiler.c
+++ b/src/compiler/compiler.c
@@ -1722,6 +1722,11 @@ static Error* exprUnaryOp(Compiler* self) {
 static Error* exprGroup(Compiler* self) {
     Error* err;
     int line = prev()->line;
+    if(match(TK_RPAREN)) {
+        // empty tuple
+        Ctx__s_push(ctx(), (Expr*)TupleExpr__new(line, 0));
+        return NULL;
+    }
     match_newlines();
     check(EXPR_TUPLE(self));  // () is just for change precedence
     match_newlines();