[clang] [Clang] Fixed a crash when instantiating an invalid out-of-line static data member definition in a local class (PR #196772)

[Younan Zhang via cfe-commits]

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@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+template <class T> int f(T) {
+  struct A {
+    static int B; // expected-error {{static data member 'B' not allowed in local struct 'A'}}
+  };
+  int A::B; // expected-note {{previous definition is here}}
+  int A::B = 1; // expected-error {{redefinition of 'B'}}
+  return 0;
+}
+
+int x = f(0);
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zyn0217 wrote:

If name lookup finds anything invalid, the declaration itself is also invalid. See this example: https://godbolt.org/z/cM5Y55s7o

`g` involves `f` which is invalid, and we mark g as invalid as well as building it with a RecoveryExpr.

https://github.com/llvm/llvm-project/pull/196772