Add test for ast-dump

Signed-off-by: yronglin <[email protected]>

Author: yronglin

clang/test/AST/ast-dump-recovery.cpp

@@ -460,3 +460,36 @@ void RecoveryForStmtCond() {
   // CHECK-NEXT:    `-CompoundStmt {{.*}}
   for (int i = 0; i < invalid; ++i) {}
 }
+
+// Fix crash issue https://github.com/llvm/llvm-project/issues/112560.
+// Make sure clang compiles the following code without crashing:
+
+// CHECK:NamespaceDecl {{.*}} GH112560
+// CHECK-NEXT:  |-CXXRecordDecl {{.*}} referenced union U definition
+// CHECK-NEXT:  | |-DefinitionData {{.*}}
+// CHECK-NEXT:  | | |-DefaultConstructor {{.*}}
+// CHECK-NEXT:  | | |-CopyConstructor {{.*}}
+// CHECK-NEXT:  | | |-MoveConstructor {{.*}}
+// CHECK-NEXT:  | | |-CopyAssignment {{.*}}
+// CHECK-NEXT:  | | |-MoveAssignment {{.*}}
+// CHECK-NEXT:  | | `-Destructor {{.*}}
+// CHECK-NEXT:  | |-CXXRecordDecl {{.*}} implicit union U
+// CHECK-NEXT:  | `-FieldDecl {{.*}} invalid f 'int'
+// CHECK-NEXT:  |   `-RecoveryExpr {{.*}} 'int' contains-errors
+// DISABLED-NOT: -RecoveryExpr {{.*}} contains-errors
+namespace GH112560 {
+union U {
+  int f = ;
+};
+
+// CHECK: FunctionDecl {{.*}} foo 'void ()'
+// CHECK-NEXT:    `-CompoundStmt {{.*}}
+// CHECK-NEXT:      `-DeclStmt {{.*}}
+// CHECK-NEXT:        `-VarDecl {{.*}} g 'U':'GH112560::U' listinit
+// CHECK-NEXT:          `-InitListExpr {{.*}} 'U':'GH112560::U' contains-errors field Field {{.*}} 'f' 'int'
+// CHECK-NEXT:            `-RecoveryExpr {{.*}} 'int' contains-errors
+// DISABLED-NOT: -RecoveryExpr {{.*}} contains-errors
+void foo() {
+  U g{};
+}
+} // namespace GH112560