1// run
2
3// Copyright 2022 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Test that the compiler's noder uses the correct type
8// for RHS shift operands that are untyped. Must compile;
9// run for good measure.
10
11package main
12
13import (
14	"fmt"
15	"math"
16)
17
18func f(x, y int) {
19	if x != y {
20		panic(fmt.Sprintf("%d != %d", x, y))
21	}
22}
23
24func main() {
25	var x int = 1
26	f(x<<1, 2)
27	f(x<<1., 2)
28	f(x<<(1+0i), 2)
29	f(x<<0i, 1)
30
31	f(x<<(1<<x), 4)
32	f(x<<(1.<<x), 4)
33	f(x<<((1+0i)<<x), 4)
34	f(x<<(0i<<x), 1)
35
36	// corner cases
37	const M = math.MaxUint
38	f(x<<(M+0), 0)     // shift by untyped int representable as uint
39	f(x<<(M+0.), 0)    // shift by untyped float representable as uint
40	f(x<<(M+0.+0i), 0) // shift by untyped complex representable as uint
41}
42