clang/test/SemaHLSL/Language/Volatile.hlsl

// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-compute -verify %s

RWByteAddressBuffer gBuf : register(u0);

[numthreads(1,1,1)]
void main() {
    // expected-error@+1 {{unknown type name 'volatile'}}
    volatile int x = 3;
    gBuf.Store(0, x);
}