[clang] [Clang] Fix finding instantiated decls for class template specializations during instantiation (PR #72346)

[Erich Keane via cfe-commits]

================
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -verify -fsyntax-only %s
----------------
erichkeane wrote:

Typically we find a similar test file and put it there, just wrapped in a namespace for the github issue.

https://github.com/llvm/llvm-project/pull/72346