void inc1(out float x)  { x++; }
void inc4(out float4 x) { x += half4(1); }

void test_a() { inc1(0); }
void test_b() { inc4(float4(0)); }
void test_c() { inc1(sqrt(1)); }

// $pure isn't allowed outside of module code, but the test still does its job; it just reports an
// additional error as well ('$pure' is not permitted here).
$pure void pure_function_with_out_param  (out float x)   { x = 1; }
$pure void pure_function_with_inout_param(inout float x) { x += 1; }

/*%%*
cannot assign to this expression
cannot assign to this expression
cannot assign to this expression
pure functions cannot have out parameters
pure functions cannot have out parameters
*%%*/