cmd/go2go: Type aliases of generic types fail to compile

[firelizzard18]

The design draft (Appendix > Generic type aliases) indicates that the following would work:

package pkg

type Vector(type T) []T
type VectorAlias = Vector
var v Vector(int)

However, it doesn't: https://go2goplay.golang.org/p/Gnfiupx2_xT

type checking failed for main
prog.go2:4:20: cannot use generic type Vector(type T) without instantiation

What version of Go are you using (go version)?

go2goplay.golang.org and go version devel +da7932368b Mon Jun 22 19:06:44 2020 +0000 linux/amd64

[griesemer]

At the moment only this works.

This is a current limitation of the prototype.

[gopherbot]

Change https://golang.org/cl/239387 mentions this issue: [dev.go2go] go/types: permit alias to generic type

[griesemer]

Turns out this was trivial to fix. Now implemented on dev.go2go. In the playground when it gets updated.

@firelizzard18 Thanks for bringing this to my attention.