golangci-lint dependency on go-critic issue w/ golang 1.13 (works w/ <=golang:1.12.7)

[DazWilkin]

Heads-up

Step #0: Pulling image: golang:1.13-rc-buster
Step #0: Digest: sha256:90c836736aff2a2fef8ad80240d2c40eb256d705c71b2cffbd502faab2bf61ea
Step #0: Status: Downloaded newer image for golang:1.13-rc-buster
Step #0: go: github.com/google/trillian@v1.3.0 requires
Step #0: 	github.com/golangci/golangci-lint@v1.17.2-0.20190630074125-360a58dca92d requires
Step #0: 	github.com/go-critic/go-critic@v0.0.0-20181204210945-1df300866540: reading https://proxy.golang.org/github.com/go-critic/go-critic/@v/v0.0.0-20181204210945-1df300866540.mod: 410 Gone
Finished Step #0
ERROR
ERROR: build step 0 "golang:1.13-rc-buster" failed: exit status 1

Appears to be addressed by:
golangci/golangci-lint#605

The issue does not appear to arise with Golang versions <=1.12.7

[DazWilkin]

The issues appear to be related to the proxy (and not Trillian or its dependencies); I'm using Cloud Build and, reading some of the commits on here, I reverted to GOPROXY=direct and everything now builds.

Filed: golang/go#33530

[bcmills]

These are real issues exposed by the fact that the proxy is now using go1.13beta1. See https://tip.golang.org/doc/go1.13#version-validation.