# Test support for go mod edit -go to set language version.

env GO111MODULE=on
! go build
stderr ' type alias requires'
go mod edit -go=1.9
grep 'go 1.9' go.mod
go build

# Reverting the version should force a rebuild and error instead of using
# the cached 1.9 build. (https://golang.org/issue/37804)
go mod edit -go=1.8
! go build
stderr 'type alias requires'

# go=none should drop the line
go mod edit -go=none
! grep go go.mod

-- go.mod --
module m
go 1.8

-- alias.go --
package alias
type T = int