Smarter splitting around named collection arguments.

test/regression/other/angular.unit

Index: test/regression/other/angular.unit
diff --git a/test/regression/other/angular.unit b/test/regression/other/angular.unit
index 4a39473ed9744c90d255444c3533af7e3e08a735..add59be8c2f32d870b34db01d3410a1d36fc527b 100644
--- a/test/regression/other/angular.unit
+++ b/test/regression/other/angular.unit
@@ -18,4 +18,28 @@
           'a': {'b': 1}
         })).toEqual(1);
       });
-    }
+    }
+>>>
+@Component(
+    selector: 'io-controller',
+    template: r'<content></content>',
+    map: const {
+      'attr': '@attr',
+      'expr': '<=>expr',
+      'once': '=>!exprOnce',
+      'ondone': '&onDone',
+      'on-optional': '&onOptional'
+    })
+class IoControllerComponent implements ScopeAware {}
+<<<
+@Component(
+    selector: 'io-controller',
+    template: r'<content></content>',
+    map: const {
+      'attr': '@attr',
+      'expr': '<=>expr',
+      'once': '=>!exprOnce',
+      'ondone': '&onDone',
+      'on-optional': '&onOptional'
+    })
+class IoControllerComponent implements ScopeAware {}