Allow splitting in redirecting constructors.

test/regression/0400/0475.unit

Index: test/regression/0400/0475.unit
diff --git a/test/regression/0400/0475.unit b/test/regression/0400/0475.unit
new file mode 100644
index 0000000000000000000000000000000000000000..0240a3d050bf93b9a6d099ae910f04bb83006287
--- /dev/null
+++ b/test/regression/0400/0475.unit
@@ -0,0 +1,12 @@
+>>>
+class ListResultDescriptor {
+  factory ListResultDescriptor(String name, List<E> defaultValue,
+      {ResultCachingPolicy<
+          List<E>> cachingPolicy}) = ListResultDescriptorImpl<E>;
+}
+<<<
+class ListResultDescriptor {
+  factory ListResultDescriptor(String name, List<E> defaultValue,
+          {ResultCachingPolicy<List<E>> cachingPolicy}) =
+      ListResultDescriptorImpl<E>;
+}