struct S { int i; };

int x;
int x;
float4x4 x;
bool2 x[2];
S x;

void func() {
    float2 y;
    float2 y;
    int y;
    float y[4];
    S y;
}

/*%%*
symbol 'x' was already defined
symbol 'x' was already defined
symbol 'x' was already defined
symbol 'x' was already defined
symbol 'y' was already defined
symbol 'y' was already defined
symbol 'y' was already defined
symbol 'y' was already defined
*%%*/