/usr/share/go-1.10/test/devirt.go is in golang-1.10-src 1.10.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | // errorcheck -0 -d=ssa/opt/debug=3
package main
// Trivial interface call devirtualization test.
type real struct {
value int
}
func (r *real) Value() int { return r.value }
type Valuer interface {
Value() int
}
type indirectiface struct {
a, b, c int
}
func (i indirectiface) Value() int {
return i.a + i.b + i.c
}
func main() {
var r Valuer
rptr := &real{value: 3}
r = rptr
if r.Value() != 3 { // ERROR "de-virtualizing call$"
panic("not 3")
}
// Can't do types that aren't "direct" interfaces (yet).
r = indirectiface{3, 4, 5}
if r.Value() != 12 {
panic("not 12")
}
}
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