/usr/share/go/test/const.go is in golang-src 2:1.2.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright 2009 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 simple boolean and numeric constants.
package main
import "os"
const (
c0 = 0
cm1 = -1
chuge = 1 << 100
chuge_1 = chuge - 1
c1 = chuge >> 100
c3div2 = 3 / 2
c1e3 = 1e3
ctrue = true
cfalse = !ctrue
)
const (
f0 = 0.0
fm1 = -1.
fhuge float64 = 1 << 100
fhuge_1 float64 = chuge - 1
f1 float64 = chuge >> 100
f3div2 = 3. / 2.
f1e3 float64 = 1e3
)
func assert(t bool, s string) {
if !t {
panic(s)
}
}
func ints() {
assert(c0 == 0, "c0")
assert(c1 == 1, "c1")
assert(chuge > chuge_1, "chuge")
assert(chuge_1+1 == chuge, "chuge 1")
assert(chuge+cm1+1 == chuge, "cm1")
assert(c3div2 == 1, "3/2")
assert(c1e3 == 1000, "c1e3 int")
assert(c1e3 == 1e3, "c1e3 float")
// verify that all (in range) are assignable as ints
var i int
i = c0
assert(i == c0, "i == c0")
i = cm1
assert(i == cm1, "i == cm1")
i = c1
assert(i == c1, "i == c1")
i = c3div2
assert(i == c3div2, "i == c3div2")
i = c1e3
assert(i == c1e3, "i == c1e3")
// verify that all are assignable as floats
var f float64
f = c0
assert(f == c0, "f == c0")
f = cm1
assert(f == cm1, "f == cm1")
f = chuge
assert(f == chuge, "f == chuge")
f = chuge_1
assert(f == chuge_1, "f == chuge_1")
f = c1
assert(f == c1, "f == c1")
f = c3div2
assert(f == c3div2, "f == c3div2")
f = c1e3
assert(f == c1e3, "f == c1e3")
}
func floats() {
assert(f0 == c0, "f0")
assert(f1 == c1, "f1")
// TODO(gri): exp/ssa/interp constant folding is incorrect.
if os.Getenv("GOSSAINTERP") == "" {
assert(fhuge == fhuge_1, "fhuge") // float64 can't distinguish fhuge, fhuge_1.
}
assert(fhuge_1+1 == fhuge, "fhuge 1")
assert(fhuge+fm1+1 == fhuge, "fm1")
assert(f3div2 == 1.5, "3./2.")
assert(f1e3 == 1000, "f1e3 int")
assert(f1e3 == 1.e3, "f1e3 float")
// verify that all (in range) are assignable as ints
var i int
i = f0
assert(i == f0, "i == f0")
i = fm1
assert(i == fm1, "i == fm1")
// verify that all are assignable as floats
var f float64
f = f0
assert(f == f0, "f == f0")
f = fm1
assert(f == fm1, "f == fm1")
f = fhuge
assert(f == fhuge, "f == fhuge")
f = fhuge_1
assert(f == fhuge_1, "f == fhuge_1")
f = f1
assert(f == f1, "f == f1")
f = f3div2
assert(f == f3div2, "f == f3div2")
f = f1e3
assert(f == f1e3, "f == f1e3")
}
func main() {
ints()
floats()
assert(ctrue == true, "ctrue == true")
assert(cfalse == false, "cfalse == false")
}
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