llvm-project/clang/test/SemaCXX/enum-bitfield.cpp

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// RUN: %clang_cc1 -fsyntax-only -pedantic -std=c++11 -verify -triple x86_64-apple-darwin %s
enum E {};
struct Z {};
typedef int Integer;
struct X {
enum E : 1;
enum E : Z; // expected-error{{invalid underlying type}}
enum E2 : int;
enum E3 : Integer;
};
struct Y {
enum E : int(2);
enum E : Z(); // expected-error{{not an integral constant}}
};