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// Copyright 2021 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.
package types_test
import (
. "go/types"
"testing"
)
func TestInstantiateEquality(t *testing.T) {
const src = genericPkg + "p; type T[P any] int"
pkg, err := pkgFor(".", src, nil)
if err != nil {
t.Fatal(err)
}
T := pkg.Scope().Lookup("T").Type().(*Named)
// Instantiating the same type twice should result in pointer-equivalent
// instances.
env := NewEnvironment()
res1, err := Instantiate(env, T, []Type{Typ[Int]}, false)
if err != nil {
t.Fatal(err)
}
res2, err := Instantiate(env, T, []Type{Typ[Int]}, false)
if err != nil {
t.Fatal(err)
}
if res1 != res2 {
t.Errorf("first instance (%s) not pointer-equivalent to second instance (%s)", res1, res2)
}
}
func TestInstantiateNonEquality(t *testing.T) {
const src = genericPkg + "p; type T[P any] int"
pkg1, err := pkgFor(".", src, nil)
if err != nil {
t.Fatal(err)
}
pkg2, err := pkgFor(".", src, nil)
if err != nil {
t.Fatal(err)
}
// We consider T1 and T2 to be distinct types, so their instances should not
// be deduplicated by the environment.
T1 := pkg1.Scope().Lookup("T").Type().(*Named)
T2 := pkg2.Scope().Lookup("T").Type().(*Named)
env := NewEnvironment()
res1, err := Instantiate(env, T1, []Type{Typ[Int]}, false)
if err != nil {
t.Fatal(err)
}
res2, err := Instantiate(env, T2, []Type{Typ[Int]}, false)
if err != nil {
t.Fatal(err)
}
if res1 == res2 {
t.Errorf("instance from pkg1 (%s) is pointer-equivalent to instance from pkg2 (%s)", res1, res2)
}
if Identical(res1, res2) {
t.Errorf("instance from pkg1 (%s) is identical to instance from pkg2 (%s)", res1, res2)
}
}
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