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[dev.typeparams] go/types: adjust logic for method expression arg naming
CL 325369 improved this logic in types2. Port this improvement back to go/types. Change-Id: I5f859cbffd88bb3db09a81c2389269f7bd0869f9 Reviewed-on: https://go-review.googlesource.com/c/go/+/330069 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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@ -587,16 +587,15 @@ func (check *Checker) selector(x *operand, e *ast.SelectorExpr) {
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if sig.params != nil {
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params = sig.params.vars
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}
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// Be consistent about named/unnamed parameters.
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needName := true
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for _, param := range params {
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if param.Name() == "" {
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needName = false
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break
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}
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}
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// Be consistent about named/unnamed parameters. This is not needed
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// for type-checking, but the newly constructed signature may appear
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// in an error message and then have mixed named/unnamed parameters.
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// (An alternative would be to not print parameter names in errors,
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// but it's useful to see them; this is cheap and method expressions
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// are rare.)
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name := ""
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if needName {
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if len(params) > 0 && params[0].name != "" {
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// name needed
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name = sig.recv.name
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if name == "" {
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name = "_"
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