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go/types: match types2 errors for incorrect method receiver count

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Use "method has no receiver" and "method has multiple receivers"
in error messages for invalid receiver counts, matching the
corresponding types2 errors.

For #54511.

Change-Id: I96fc99440d6206c74e9416069db052234baa8248
Reviewed-on: https://go-review.googlesource.com/c/go/+/424934
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
This commit is contained in:
Robert Griesemer 2022-08-18 20:16:15 -07:00
parent 84232b0b89
commit dbc3b44f85
3 changed files with 7 additions and 7 deletions
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2
src/go/types/resolver.go
View File

@ -394,7 +394,7 @@ func (check *Checker) collectObjects() {
if d.decl.Recv.NumFields() == 0 {
// regular function
if d.decl.Recv != nil {
check.error(d.decl.Recv, _BadRecv, "method is missing receiver")
check.error(d.decl.Recv, _BadRecv, "method has no receiver")
// treat as function
}
if name == "init" || (name == "main" && check.pkg.name == "main") {

2
src/go/types/signature.go
View File

@ -196,7 +196,7 @@ func (check *Checker) funcType(sig *Signature, recvPar *ast.FieldList, ftyp *ast
recv = NewParam(token.NoPos, nil, "", Typ[Invalid]) // ignore recv below
default:
// more than one receiver
check.error(recvList[len(recvList)-1], _InvalidRecv, "method must have exactly one receiver")
check.error(recvList[len(recvList)-1], _InvalidRecv, "method has multiple receivers")
fallthrough // continue with first receiver
case 1:
recv = recvList[0]

10
src/go/types/testdata/check/decls2/decls2a.go vendored
View File

@ -86,11 +86,11 @@ func (ptr /* ERROR "invalid receiver" */ ) _() {}
func (* /* ERROR "invalid receiver" */ ptr) _() {}
// Methods with zero or multiple receivers.
func ( /* ERROR "missing receiver" */ ) _() {}
func (T3, * /* ERROR "exactly one receiver" */ T3) _() {}
func (T3, T3, T3 /* ERROR "exactly one receiver" */ ) _() {}
func (a, b /* ERROR "exactly one receiver" */ T3) _() {}
func (a, b, c /* ERROR "exactly one receiver" */ T3) _() {}
func ( /* ERROR "method has no receiver" */ ) _() {}
func (T3, * /* ERROR "method has multiple receivers" */ T3) _() {}
func (T3, T3, T3 /* ERROR "method has multiple receivers" */ ) _() {}
func (a, b /* ERROR "method has multiple receivers" */ T3) _() {}
func (a, b, c /* ERROR "method has multiple receivers" */ T3) _() {}
// Methods associated with non-local or unnamed types.
func (int /* ERROR "cannot define new methods on non-local type int" */ ) m() {}