[PATCH] D136259: Fix crash in constraining partial specialization on nested template.

[Utkarsh Saxena via Phabricator via cfe-commits]

usaxena95 updated this revision to Diff 468925.
usaxena95 added a comment.

Added test.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136259/new/

https://reviews.llvm.org/D136259

Files:
  clang/lib/Sema/SemaTemplateDeduction.cpp
  clang/test/SemaTemplate/concepts-GH53354.cpp


Index: clang/test/SemaTemplate/concepts-GH53354.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaTemplate/concepts-GH53354.cpp
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -std=c++20 -verify %s
+// expected-no-diagnostics
+
+template <template <class> class>
+struct S
+{};
+
+template <class T>
+concept C1 = requires
+{
+  typename S<T::template value_types>;
+};
+
+template <class T>
+requires C1<T>
+struct A {};
+
+template <class T>
+requires C1<T> and true
+struct A<T> {};
\ No newline at end of file
Index: clang/lib/Sema/SemaTemplateDeduction.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateDeduction.cpp
+++ clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -5804,10 +5804,10 @@
   }
 
   bool TraverseTemplateName(TemplateName Template) {
-    if (auto *TTP =
-            dyn_cast<TemplateTemplateParmDecl>(Template.getAsTemplateDecl()))
-      if (TTP->getDepth() == Depth)
-        Used[TTP->getIndex()] = true;
+    if (TemplateDecl *TD = Template.getAsTemplateDecl())
+      if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TD))
+        if (TTP->getDepth() == Depth)
+          Used[TTP->getIndex()] = true;
     RecursiveASTVisitor<MarkUsedTemplateParameterVisitor>::
         TraverseTemplateName(Template);
     return true;


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