// Code generated by "go test -run=Generate -write=all"; DO NOT EDIT. // Source: ../../cmd/compile/internal/types2/context_test.go // 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 import ( "testing" ) func TestContextHashCollisions(t *testing.T) { if debug { t.Skip("hash collisions are expected, and would fail debug assertions") } // Unit test the de-duplication fall-back logic in Context. // // We can't test this via Instantiate because this is only a fall-back in // case our hash is imperfect. // // These lookups and updates use reasonable looking types in an attempt to // make them robust to internal type assertions, but could equally well use // arbitrary types. // Create some distinct origin types. nullaryP and nullaryQ have no // parameters and are identical (but have different type parameter names). // unaryP has a parameter. var nullaryP, nullaryQ, unaryP Type { // type nullaryP = func[P any]() tparam := NewTypeParam(NewTypeName(nopos, nil, "P", nil), &emptyInterface) nullaryP = NewSignatureType(nil, nil, []*TypeParam{tparam}, nil, nil, false) } { // type nullaryQ = func[Q any]() tparam := NewTypeParam(NewTypeName(nopos, nil, "Q", nil), &emptyInterface) nullaryQ = NewSignatureType(nil, nil, []*TypeParam{tparam}, nil, nil, false) } { // type unaryP = func[P any](_ P) tparam := NewTypeParam(NewTypeName(nopos, nil, "P", nil), &emptyInterface) params := NewTuple(NewVar(nopos, nil, "_", tparam)) unaryP = NewSignatureType(nil, nil, []*TypeParam{tparam}, params, nil, false) } ctxt := NewContext() // Update the context with an instantiation of nullaryP. inst := NewSignatureType(nil, nil, nil, nil, nil, false) if got := ctxt.update("", nullaryP, []Type{Typ[Int]}, inst); got != inst { t.Error("bad") } // unaryP is not identical to nullaryP, so we should not get inst when // instantiated with identical type arguments. if got := ctxt.lookup("", unaryP, []Type{Typ[Int]}); got != nil { t.Error("bad") } // nullaryQ is identical to nullaryP, so we *should* get inst when // instantiated with identical type arguments. if got := ctxt.lookup("", nullaryQ, []Type{Typ[Int]}); got != inst { t.Error("bad") } // ...but verify we don't get inst with different type arguments. if got := ctxt.lookup("", nullaryQ, []Type{Typ[String]}); got != nil { t.Error("bad") } }