Do not allow empty path in plain links and do not remove "//" in regular links.

src/parser/plain_link.rs

@@ -142,7 +142,7 @@ fn file_path_plain<'b, 'g, 'r, 's>(
             parse_file_and_application,
         ),
         tag(":"),
-        recognize(opt(parser_with_context!(path_plain)(&parser_context))),
+        parser_with_context!(path_plain)(&parser_context),
         opt(map(
             tuple((
                 tag("::"),

src/parser/regular_link.rs

@@ -271,9 +271,8 @@ fn file_path_reg<'b, 'g, 'r, 's>(
                         parse_file_and_application,
                     ),
                     tag(":"),
-                    opt(tag("//")),
                 )),
-                |(_, application, _, _)| application,
+                |(_, application, _)| application,
             ),
             map(peek(tag(".")), |_| None),
             map(peek(tag("/")), |_| None),