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1// RUN: %clang_cc1 -fsyntax-only -verify=c23 -std=c23 %s -Wpre-c2x-compat2// RUN: %clang_cc1 -fsyntax-only -verify=c17 -std=c17 %s3 4constexpr int a = 0; // c17-error {{unknown type name 'constexpr'}} \5 c23-warning {{'constexpr' is incompatible with C standards before C23}}6 7void func(int array[constexpr]); // c23-error {{expected expression}} \8 // c17-error {{use of undeclared}}9 10_Atomic constexpr int b = 0; // c23-error {{constexpr variable cannot have type 'const _Atomic(int)'}} \11 // c23-warning {{'constexpr' is incompatible with C standards before C23}} \12 // c17-error {{unknown type name 'constexpr'}}13 14int static constexpr c = 1; // c17-error {{expected ';' after top level declarator}} \15 // c23-warning {{'constexpr' is incompatible with C standards before C23}}16