Source file test/shift3.go

     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  
    11  package main
    12  
    13  import (
    14  	"fmt"
    15  	"math"
    16  )
    17  
    18  func f(x, y int) {
    19  	if x != y {
    20  		panic(fmt.Sprintf("%d != %d", x, y))
    21  	}
    22  }
    23  
    24  func 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  

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