This test verifies that we fail loudly if a module name contains
command-line-arguments.

-- flags --
-errors_ok

-- go.mod --
module command-line-arguments //@diag("module", re`command-line-arguments.*disallowed`)

go 1.12

-- x/x.go --
package x //@diag("x", re`command-line-arguments.*disallowed`)
