func _() {
	var f1, f2, f3, ftmp float64
	_ = f1 + float64(f2*f3)
	ftmp = float64(f2 * f3)
	_ = f1 + ftmp
	ftmp = f2 * f3
	_ = f1 + float64(ftmp)
	var c1, c2, c3, ctmp complex128
	_ = c1 + complex128(c2*c3)
	ctmp = complex128(c2 * c3)
	_ = c1 + ctmp
	ctmp = c2 * c3
	_ = c1 + complex128(ctmp)
}
Make sure we don't remove explicit conversions that
prevent fusing floating-point operation.
TODO(mdempsky): Test -fastmath=true.
package testdata
func _() {
	const (
		_ = byte(0)
		_ = int((real)(0i))
		_ = complex64(complex(1, 2))
		_ = (bool)(true || false)
		PtrSize = 4 << (^uintptr(0) >> 63)
		c0      = uintptr(PtrSize)
		c1      = uintptr((8-PtrSize)/4*2860486313 + (PtrSize-4)/4*33054211828000289)
	)
	i := int64(0)
	_ = i
}
func _() {
	type F func(F) int
	var f F
	_ = F(F(nil))  
	_ = f(F(nil))
}