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

env GO111MODULE=on
! go build
stderr ' type aliases 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 aliases requires'


-- go.mod --
module m
go 1.8

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