test/shift3.go

// run

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test that the compiler's noder uses the correct type
// for RHS shift operands that are untyped. Must compile;
// run for good measure.

package main

import (
	"fmt"
	"math"
)

func f(x, y int) {
	if x != y {
		panic(fmt.Sprintf("%d != %d", x, y))
	}
}

func main() {
	var x int = 1
	f(x<<1, 2)
	f(x<<1., 2)
	f(x<<(1+0i), 2)
	f(x<<0i, 1)

	f(x<<(1<<x), 4)
	f(x<<(1.<<x), 4)
	f(x<<((1+0i)<<x), 4)
	f(x<<(0i<<x), 1)

	// corner cases
	const M = math.MaxUint
	f(x<<(M+0), 0)     // shift by untyped int representable as uint
	f(x<<(M+0.), 0)    // shift by untyped float representable as uint
	f(x<<(M+0.+0i), 0) // shift by untyped complex representable as uint
}