cannot update VCS dir for github.com/labstack/echo: error: pathspec 'v3.2.1+incompatible' did not match any file(s) known to git. about gohack HOT 3 CLOSED

% cat main.go
package main

import _ "github.com/labstack/echo"

func main() {
}
% go install
go: finding github.com/labstack/echo v3.2.1+incompatible
go: downloading github.com/labstack/echo v3.2.1+incompatible
go: finding golang.org/x/crypto/acme/autocert latest
go: finding golang.org/x/crypto/acme latest
go: finding golang.org/x/crypto latest
go: finding github.com/labstack/gommon/color latest
go: finding github.com/labstack/gommon/log latest
go: finding github.com/labstack/gommon v0.2.7
go: downloading github.com/labstack/gommon v0.2.7
go: finding github.com/valyala/fasttemplate latest
go: downloading github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4
go: finding github.com/valyala/bytebufferpool v1.0.0
go: downloading github.com/valyala/bytebufferpool v1.0.0
% gohack get github.com/labstack/echo
github.com/labstack/echo => /home/rog/gohack/github.com/labstack/echo
% cat go.mod
module github.com/rogpeppe/test2

require (
	github.com/labstack/echo v3.2.1+incompatible
	github.com/labstack/gommon v0.2.7 // indirect
	github.com/mattn/go-colorable v0.0.9 // indirect
	github.com/mattn/go-isatty v0.0.4 // indirect
	github.com/rogpeppe/test2/submod v0.0.0-20180818191235-66d0476
	github.com/valyala/bytebufferpool v1.0.0 // indirect
	github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4 // indirect
	golang.org/x/crypto v0.0.0-20181001203147-e3636079e1a4 // indirect
)

replace github.com/labstack/echo => /home/rog/gohack/github.com/labstack/echo