internal/lsp/cmd: fix regexp in test

The test fails if the GOROOT directory contains a dash, e.g. as in
/usr/lib/google-golang on corporate workstations, or on certain
builders.

Change-Id: If08c438764f4b76fff7fb43ccf3e4fd56afeff1a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/168063
Reviewed-by: Ian Cottrell <iancottrell@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

internal/lsp/cmd/definition_test.go

@@ -38,7 +38,7 @@ func TestDefinitionHelpExample(t *testing.T) {
 	}
 	thisFile := filepath.Join(dir, "definition.go")
 	baseArgs := []string{"query", "definition"}
-	expect := regexp.MustCompile(`^[\w/\\:_]+flag[/\\]flag.go:\d+:\d+-\d+: defined here as type flag.FlagSet struct{.*}$`)
+	expect := regexp.MustCompile(`^[\w/\\:_-]+flag[/\\]flag.go:\d+:\d+-\d+: defined here as type flag.FlagSet struct{.*}$`)
 	for _, query := range []string{
 		fmt.Sprintf("%v:%v:%v", thisFile, cmd.ExampleLine, cmd.ExampleColumn),
 		fmt.Sprintf("%v:#%v", thisFile, cmd.ExampleOffset)} {