impossible happened --> panic

[elvizlai]

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ? revisit gopkg.in/kataras/go-serializer.v0 to add 1 pkgs
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ✓ include 1 more pkgs from gopkg.in/kataras/go-serializer.v0@master
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ? revisit github.com/kataras/go-serializer to add 6 pkgs
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ✓ include 6 more pkgs from github.com/kataras/[email protected]
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ? attempt gopkg.in/iris-contrib/websocket.v4 with 1 pkgs; 2 versions to try
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | try gopkg.in/iris-contrib/websocket.v4@v5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ✗ gopkg.in/iris-contrib/websocket.v4 at v5 has problem subpkg(s):
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 	gopkg.in/iris-contrib/websocket.v4 is missing; required by gopkg.in/kataras/iris.v5@v4.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | try gopkg.in/iris-contrib/[email protected]
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ✗ gopkg.in/iris-contrib/websocket.v4 at 5.0.0 has problem subpkg(s):
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 	gopkg.in/iris-contrib/websocket.v4 is missing; required by gopkg.in/kataras/iris.v5@v4.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ← no more versions of gopkg.in/iris-contrib/websocket.v4 to try; begin backtrack
panic: canary - *should* be impossible to have a pkg-only selection here

goroutine 1 [running]:
panic(0x3866c0, 0xc4203cab40)
	/usr/local/go/src/runtime/panic.go:500 +0x1a1
github.com/golang/dep/vendor/github.com/sdboyer/gps.(*solver).backtrack(0xc4205ba000, 0xc42064c6f1)
	/Users/elvizlai/GoLib/src/github.com/golang/dep/vendor/github.com/sdboyer/gps/solver.go:892 +0xa84
github.com/golang/dep/vendor/github.com/sdboyer/gps.(*solver).solve(0xc4205ba000, 0x0, 0x0, 0xc420377f20)
	/Users/elvizlai/GoLib/src/github.com/golang/dep/vendor/github.com/sdboyer/gps/solver.go:371 +0x791
github.com/golang/dep/vendor/github.com/sdboyer/gps.(*solver).Solve(0xc4205ba000, 0x49, 0xc4200120d1, 0x1c, 0xc420160e70)
	/Users/elvizlai/GoLib/src/github.com/golang/dep/vendor/github.com/sdboyer/gps/solver.go:317 +0x8e
main.(*initCommand).Run(0x5f7e70, 0xc4201796d0, 0xc4200781d0, 0x0, 0x0, 0x0, 0x0)
	/Users/elvizlai/GoLib/src/github.com/golang/dep/cmd/dep/init.go:154 +0x1036
main.main()
	/Users/elvizlai/GoLib/src/github.com/golang/dep/cmd/dep/main.go:96 +0x652

[sdboyer]

Mm, that's a new canary panic (as opposed to the one in #171).

If the project/repo you were working on is public, could you provide detailed steps for reproduction? I'm pretty sure I know where the problem is even without detailed steps, but it still helps 😄

[sdboyer]

bump - i have a sec to work on this soon, but again, it'd be easier if there's a public repo I could work from to replicate.