//TEST:SIMPLE(filecheck=CHECK): -target glsl -stage compute -entry computeMain
//TEST:SIMPLE(filecheck=CHECK): -target hlsl -stage compute -entry computeMain
//TEST:SIMPLE(filecheck=CHECK): -target cuda -stage compute -entry computeMain
//TEST:SIMPLE(filecheck=CHECK): -target cpp -stage compute -entry computeMain

//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<int> outputBuffer;


interface IFoo
{
    int foo(int a);
}

struct MyImpl : IFoo
{
    int foo(int a) { return a; }
}

struct MyImpl1 : IFoo
{
    int foo(int a) { return a; }
}

int test(IFoo foo, int idx)
{
    int val = 0;
    // CHECK: error 20002: syntax error.
    if ((let a = foo as MyImpl))
    {
        val = a.foo(idx);
    }
    return (val);
}


[numthreads(4, 1, 1)]
void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
{
    MyImpl impl;
    outputBuffer[dispatchThreadID.x] = test(impl, dispatchThreadID.x);
}