1 // run 2 3 // Copyright 2017 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 package main 8 9 import "fmt" 10 11 // issue 17446 12 const ( 13 _ = real(0) // from bug report 14 _ = imag(0) // from bug report 15 16 // if the arguments are untyped, the results must be untyped 17 // (and compatible with types that can represent the values) 18 _ int = real(1) 19 _ int = real('a') 20 _ int = real(2.0) 21 _ int = real(3i) 22 23 _ float32 = real(1) 24 _ float32 = real('a') 25 _ float32 = real(2.1) 26 _ float32 = real(3.2i) 27 28 _ float64 = real(1) 29 _ float64 = real('a') 30 _ float64 = real(2.1) 31 _ float64 = real(3.2i) 32 33 _ int = imag(1) 34 _ int = imag('a') 35 _ int = imag(2.1 + 3i) 36 _ int = imag(3i) 37 38 _ float32 = imag(1) 39 _ float32 = imag('a') 40 _ float32 = imag(2.1 + 3.1i) 41 _ float32 = imag(3i) 42 43 _ float64 = imag(1) 44 _ float64 = imag('a') 45 _ float64 = imag(2.1 + 3.1i) 46 _ float64 = imag(3i) 47 ) 48 49 var tests = []struct { 50 code string 51 got, want interface{} 52 }{ 53 {"real(1)", real(1), 1.0}, 54 {"real('a')", real('a'), float64('a')}, 55 {"real(2.0)", real(2.0), 2.0}, 56 {"real(3.2i)", real(3.2i), 0.0}, 57 58 {"imag(1)", imag(1), 0.0}, 59 {"imag('a')", imag('a'), 0.0}, 60 {"imag(2.1 + 3.1i)", imag(2.1 + 3.1i), 3.1}, 61 {"imag(3i)", imag(3i), 3.0}, 62 } 63 64 func main() { 65 // verify compile-time evaluated constant expressions 66 for _, test := range tests { 67 if test.got != test.want { 68 panic(fmt.Sprintf("%s: %v (%T) != %v (%T)", test.code, test.got, test.got, test.want, test.want)) 69 } 70 } 71 } 72
