verifyGCInfo(t, "stack Ptr", &x, infoPtr)
		runtime.KeepAlive(x)
	}
	{
		var x ScalarPtr
		verifyGCInfo(t, "stack ScalarPtr", &x, infoScalarPtr)
		runtime.KeepAlive(x)
	}
	{
		var x PtrScalar
		verifyGCInfo(t, "stack PtrScalar", &x, infoPtrScalar)
		runtime.KeepAlive(x)
	}
	{
		var x BigStruct
		verifyGCInfo(t, "stack BigStruct", &x, infoBigStruct())
		runtime.KeepAlive(x)
	}
	{
		var x string

		// or else reflect will use it instead of having to construct one.
		// The goal is to test the construction.
		type Scalar struct{ x uintptr }
		type Ptr struct{ x *byte }
		type Ptrscalar struct {
			*byte
			uintptr
		}
		type Scalarptr struct {
			uintptr
			*byte
		}
		type Bigptrscalar struct {
			_ [100]*byte
			_ [100]uintptr
		}
		type Int64 int64