From 767d47a842700653b8deffe82ccb3c85ad582c13 Mon Sep 17 00:00:00 2001
From: Tim Foley <tfoley@nvidia.com>
Date: Sat, 8 Jul 2017 18:13:53 -0700
Subject: Fix constant folding for `ParenExpr`

Adding an explicit AST node for `(expr)` was a good change, but it broke constant folding because I forgot to handle it.
---
 source/slang/check.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'source')

diff --git a/source/slang/check.cpp b/source/slang/check.cpp
index 2b9abef90..b87f7c6bc 100644
--- a/source/slang/check.cpp
+++ b/source/slang/check.cpp
@@ -2128,6 +2128,12 @@ namespace Slang
         RefPtr<IntVal> TryConstantFoldExpr(
             ExpressionSyntaxNode* expr)
         {
+            // Unwrap any "identity" expressions
+            while (auto parenExpr = dynamic_cast<ParenExpr*>(expr))
+            {
+                expr = parenExpr->base;
+            }
+
             // TODO(tfoley): more serious constant folding here
             if (auto constExp = dynamic_cast<ConstantExpressionSyntaxNode*>(expr))
             {
-- 
cgit v1.2.3