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[dev.typeparams] go/types: use correct type parameter list in missingMethod
This is a port of CL 321232 to go/types, adjusted to add a missing comment and to remove optional support for method type params. Fixes #46275 Change-Id: I63fcbb669e7607876a888fca89b9064568805448 Reviewed-on: https://go-review.googlesource.com/c/go/+/324751 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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@ -327,11 +327,15 @@ func (check *Checker) missingMethod(V Type, T *Interface, static bool) (method,
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return m, f
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return m, f
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}
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}
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// both methods must have the same number of type parameters
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ftyp := f.typ.(*Signature)
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ftyp := f.typ.(*Signature)
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mtyp := m.typ.(*Signature)
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mtyp := m.typ.(*Signature)
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if len(ftyp.tparams) != len(mtyp.tparams) {
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if len(ftyp.tparams) != len(mtyp.tparams) {
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return m, f
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return m, f
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}
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}
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if len(ftyp.tparams) > 0 {
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panic("internal error: method with type parameters")
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}
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// If the methods have type parameters we don't care whether they
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// If the methods have type parameters we don't care whether they
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// are the same or not, as long as they match up. Use unification
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// are the same or not, as long as they match up. Use unification
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@ -385,6 +389,9 @@ func (check *Checker) missingMethod(V Type, T *Interface, static bool) (method,
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if len(ftyp.tparams) != len(mtyp.tparams) {
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if len(ftyp.tparams) != len(mtyp.tparams) {
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return m, f
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return m, f
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}
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}
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if len(ftyp.tparams) > 0 {
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panic("internal error: method with type parameters")
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}
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// If V is a (instantiated) generic type, its methods are still
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// If V is a (instantiated) generic type, its methods are still
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// parameterized using the original (declaration) receiver type
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// parameterized using the original (declaration) receiver type
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@ -412,7 +419,7 @@ func (check *Checker) missingMethod(V Type, T *Interface, static bool) (method,
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// TODO(gri) is this always correct? what about type bounds?
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// TODO(gri) is this always correct? what about type bounds?
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// (Alternative is to rename/subst type parameters and compare.)
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// (Alternative is to rename/subst type parameters and compare.)
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u := newUnifier(check, true)
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u := newUnifier(check, true)
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u.x.init(ftyp.tparams)
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u.x.init(ftyp.rparams)
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if !u.unify(ftyp, mtyp) {
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if !u.unify(ftyp, mtyp) {
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return m, f
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return m, f
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}
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}
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27
src/go/types/testdata/fixedbugs/issue46275.go2
vendored
Normal file
27
src/go/types/testdata/fixedbugs/issue46275.go2
vendored
Normal file
@ -0,0 +1,27 @@
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package issue46275
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type N[T any] struct {
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*N[T]
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t T
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}
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func (n *N[T]) Elem() T {
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return n.t
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}
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type I interface {
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Elem() string
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}
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func _() {
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var n1 *N[string]
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var _ I = n1
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type NS N[string]
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var n2 *NS
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var _ I = n2
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}
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