gccgo: confusing error message when encountering invalid .. (dot dot) token

For

$ cat y.go package p func f(x ..int) {}

current gccgo reports the errors:

$ gccgo -c y.go y.go:3:10: error: expected package 3 | func f(x ..int) {} | ^ y.go:3:8: error: invalid named/anonymous mix 3 | func f(x ..int) {} | ^

I would have expected an error at the .. as it is not a valid token.

For the reference, cmd/compile reports for the same file:

$ go tool compile y.go y.go:3:11: syntax error: unexpected ., expecting name

which seems more sensible.

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