In Go 1.18 types.AssignableTo() started reporting that an invalid type
is assignable to any interface. *types.PkgName (i.e. an import at the
top of the file) has an invalid type for its Type(), so we started
thinking all in scope imports were great candidates when the expected
type was an interface.
Fix by wrapping the AssignableTo (and AssertableTo) to explicitly
return false if either operand is invalid.
Updates golang/go#53595
Change-Id: Ie5a84b7f410ff5c73c6b7870e052bafaf3e21e99
Reviewed-on: https://go-review.googlesource.com/c/tools/+/415595
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
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