From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Thu, 26 Sep 2019 22:28:32 +0000 (+0000)
Subject: Always rebuild a DeclRefExpr if its FoundDecl would change.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c826b8988aa9d245942908e6bef7fc7c1992540e;p=clang

Always rebuild a DeclRefExpr if its FoundDecl would change.

Fixes a regression introduced by r369999.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@373022 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 9218f9eeb5..84e38c6d78 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -9219,6 +9219,7 @@ TreeTransform<Derived>::TransformDeclRefExpr(DeclRefExpr *E) {
   if (!getDerived().AlwaysRebuild() &&
       QualifierLoc == E->getQualifierLoc() &&
       ND == E->getDecl() &&
+      Found == E->getFoundDecl() &&
       NameInfo.getName() == E->getDecl()->getDeclName() &&
       !E->hasExplicitTemplateArgs()) {
 
diff --git a/test/SemaTemplate/using-decl.cpp b/test/SemaTemplate/using-decl.cpp
new file mode 100644
index 0000000000..1ef2a2dfaa
--- /dev/null
+++ b/test/SemaTemplate/using-decl.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -std=c++2a -verify %s
+// expected-no-diagnostics
+
+namespace UsingInGenericLambda {
+  namespace a {
+    enum { b };
+  }
+  template<typename> void c() {
+    auto d = [](auto) {
+      using a::b;
+      (void)b;
+    };
+    d(0);
+  }
+  void e() { c<int>(); }
+}