cmd/go/internal/modload: classify "invalid pseudo-version" errors in Query
If we encounter an unclassified error in modload.Query, it takes
precedence even if the package is found in some other module.
(That is intentional, so that if a package exists in both a parent
and a nested module the outcome is deterministic, and does not shift
if a temporary error causes one of the modules to be unavailable.)
A pseudo-version is formed from a base version and a commit hash.
Each version tag is specific to the module in a particular directory
of the repo (often the root directory), whereas the commit hash is
the same for all subdirectories. When we go to check a particular
subdirectory for the requested package, we may find that that version
is not valid for that combination of <subdirectory, commit hash>,
but we should keep looking to see whether it is valid for a module
in some other subdirectory.
Fixes #47650.
Change-Id: Id48f590ce906a3d4cf4e82fc66137bf67613277d
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest,gotip-windows-amd64-longtest
Reviewed-on: https://go-review.googlesource.com/c/go/+/548475 Reviewed-by: Michael Matloob <matloob@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Bryan Mills <bcmills@google.com>