[Clang] prevent checking destructor reference with an invalid initializer (#97860)

Fixes #97230

Author: a-tarasyuk

clang/docs/ReleaseNotes.rst

@@ -163,6 +163,7 @@ Bug Fixes to C++ Support
 
 - Fixed a crash when an expression with a dependent ``__typeof__`` type is used as the operand of a unary operator. (#GH97646)
 - Fixed a failed assertion when checking invalid delete operator declaration. (#GH96191)
+- Fix a crash when checking destructor reference with an invalid initializer. (#GH97230)
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^

clang/lib/Sema/SemaInit.cpp

@@ -1986,6 +1986,9 @@ static bool checkDestructorReference(QualType ElementType, SourceLocation Loc,
     return false;
 
   CXXDestructorDecl *Destructor = SemaRef.LookupDestructor(CXXRD);
+  if (!Destructor)
+    return false;
+
   SemaRef.CheckDestructorAccess(Loc, Destructor,
                                 SemaRef.PDiag(diag::err_access_dtor_temp)
                                 << ElementType);

clang/test/SemaCXX/destructor.cpp

@@ -577,4 +577,13 @@ static_assert(!__is_trivially_constructible(Foo, const Foo &), "");
 static_assert(!__is_trivially_constructible(Foo, Foo &&), "");
 } // namespace GH89544
 
+namespace GH97230 {
+struct X {
+  ~X() = defaul; // expected-error {{initializer on function does not look like a pure-specifier}} \
+                 // expected-error {{use of undeclared identifier 'defaul'}}
+};
+struct Y : X {} y1{ }; // expected-error {{call to implicitly-deleted default constructor of 'struct Y'}} \
+                       // expected-note {{default constructor of 'Y' is implicitly deleted because base class 'X' has no destructor}}
+}
+
 #endif // BE_THE_HEADER