[link-to-valid.html]
  [:link-to(--loc) { } should be a valid rule]
    expected: FAIL

  [:link-To( --loc ){}  should be a valid rule]
    expected: FAIL

  [:link-to(url-pattern("/:foo/*")) { } should be a valid rule]
    expected: FAIL

  [:link-to( url-Pattern( '/:foo/*' ) ){}  should be a valid rule]
    expected: FAIL

  [:link-to(url("/foo/")) { } should be a valid rule]
    expected: FAIL

  [:link-To( Url( /foo/ ) ) { } should be a valid rule]
    expected: FAIL