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[dev.typeparams] cmd/compile/internal/types2: use correct type parameter list in missingMethod
For #46275 Change-Id: Iaed9d8ba034ad793e5c57f2be174f01a535fee95 Reviewed-on: https://go-review.googlesource.com/c/go/+/321232 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -333,6 +333,9 @@ 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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return m, f
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}
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if !acceptMethodTypeParams && 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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// are the same or not, as long as they match up. Use unification
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@ -386,6 +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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return m, f
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}
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if !acceptMethodTypeParams && 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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// parameterized using the original (declaration) receiver type
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@ -413,7 +419,20 @@ 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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// (Alternative is to rename/subst type parameters and compare.)
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u := newUnifier(check, true)
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u.x.init(ftyp.tparams)
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if len(ftyp.tparams) > 0 {
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// We reach here only if we accept method type parameters.
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// In this case, unification must consider any receiver
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// and method type parameters as "free" type parameters.
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assert(acceptMethodTypeParams)
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// We don't have a test case for this at the moment since
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// we can't parse method type parameters. Keeping the
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// unimplemented call so that we test this code if we
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// enable method type parameters.
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unimplemented()
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u.x.init(append(ftyp.rparams, ftyp.tparams...))
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} else {
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u.x.init(ftyp.rparams)
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}
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if !u.unify(ftyp, mtyp) {
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return m, f
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}
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26
src/cmd/compile/internal/types2/testdata/fixedbugs/issue46275.go2
vendored
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26
src/cmd/compile/internal/types2/testdata/fixedbugs/issue46275.go2
vendored
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@ -0,0 +1,26 @@
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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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