Fix all strong mode errors and warnings.

lib/src/property.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /** Representations of CSS styles. */
 
 part of csslib.parser;
 
 // TODO(terry): Prune down this file we do need some of the code in this file
 //              for darker, lighter, how to represent a Font, etc but alot of
@@ skipping 1214 matching lines @@
    */
   num get width => (left != null ? left : 0) + (right != null ? right : 0);
 
   /**
    * The total size of the vertical edges. Equal to [top] + [bottom], where
    * null is interpreted as 0px.
    */
   num get height => (top != null ? top : 0) + (bottom != null ? bottom : 0);
 }
 
-_mergeVal(x, y) => y != null ? y : x;
+/*=T*/ _mergeVal/*<T>*/(/*=T*/ x, /*=T*/ y) => y != null ? y : x;

[terry, 2016/04/14 21:16:43]

grep/regex ?

[Bob Nystrom, 2016/04/21 00:06:59]

Heh, nope. This is the actual current comment-based generic method syntax. With
the real syntax, this will become:

T _mergeVal<T>(T x, T y) => y != null ? y : x;

But the VM and dart2js don't support that yet.