std: URLs without schemes parse as errors. Closes #3112

Author: brson

src/libstd/net_url.rs

@@ -353,7 +353,7 @@ fn get_scheme(rawurl: ~str) -> result::result<(~str, ~str), @~str> {
           }
         }
     };
-    return result::ok((copy rawurl, ~""));
+    return result::err(@~"url: Scheme must be terminated with a colon.");
 }
 
 // returns userinfo, host, port, and unparsed part, or an error
@@ -779,6 +779,11 @@ mod tests {
         assert option::unwrap(copy u.fragment) == ~"something";
     }
 
+    #[test]
+    fn test_no_scheme() {
+        assert result::is_err(get_scheme(~"noschemehere.html"));
+    }
+
     #[test]
     fn test_invalid_scheme_errors() {
         assert result::is_err(from_str(~"99://something"));