| // 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 types2_test |
| |
| import ( |
| . "cmd/compile/internal/types2" |
| "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) |
| } |
| } |