cmd/compile/internal/types2: superfluous error message for [...]byte("foo")

[griesemer]

package p
var _ = [...]byte("foo")

produces the type checker errors:

x.go:2:9: invalid use of [...] array (outside a composite literal)
x.go:2:19: cannot convert "foo" (untyped string constant) to [-1]byte

The 2nd error is not needed and also misleading.

cc: @findleyr

[griesemer]

Correction: go/types seems to be doing it right.
It appears that go/types doesn't report an error at all. Filed separate error: #45651.

[gopherbot]

Change https://golang.org/cl/311889 mentions this issue: cmd/compile/internal/types2: avoid follow-on errors for invalid [...] array