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[dev.regabi] cmd/compile: silence errors about missing blank methods

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If an interface contains a blank method, that's already an error. No
need for useless follow-up error messages about not implementing them.

Fixes #42964.

Change-Id: I5bf53a8f27d75d4c86c61588c5e2e3e95563d320
Reviewed-on: https://go-review.googlesource.com/c/go/+/275294
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Matthew Dempsky 2020-12-03 14:00:19 -08:00
parent e885df2731
commit d90b199e9c
3 changed files with 8 additions and 16 deletions
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12
src/cmd/compile/internal/gc/dcl.go
View File

@ -317,18 +317,6 @@ func colasdefn(left []ir.Node, defn ir.Node) {
}
}
// declare the arguments in an
// interface field declaration.
func ifacedcl(n *ir.Field) {
if n.Sym == nil {
base.Fatalf("ifacedcl")
}
if n.Sym.IsBlank() {
base.Errorf("methods must have a unique non-blank name")
}
}
// declare the function proper
// and declare the arguments.
// called in extern-declaration context

5
src/cmd/compile/internal/gc/noder.go
View File

@ -899,10 +899,13 @@ func (p *noder) interfaceType(expr *syntax.InterfaceType) ir.Node {
n = ir.NewField(p.pos(method), nil, importName(p.packname(method.Type)).(ir.Ntype), nil)
} else {
mname := p.name(method.Name)
if mname.IsBlank() {
base.Errorf("methods must have a unique non-blank name")
continue
}
sig := p.typeExpr(method.Type).(*ir.FuncType)
sig.Recv = fakeRecv()
n = ir.NewField(p.pos(method), mname, sig, nil)
ifacedcl(n)
}
l = append(l, n)
}

7
test/interface/explicit.go
View File

@ -100,6 +100,7 @@ type T2 struct{}
func (t *T2) M() {}
func (t *T2) _() {}
// Check that nothing satisfies an interface with blank methods.
var b1 B1 = &T2{} // ERROR "incompatible|missing _ method"
var b2 B2 = &T2{} // ERROR "incompatible|missing _ method"
// Already reported about the invalid blank interface method above;
// no need to report about not implementing it.
var b1 B1 = &T2{}
var b2 B2 = &T2{}