More sophisticated handling of parameter metadata.

test/whitespace/metadata.unit

Index: test/whitespace/metadata.unit
diff --git a/test/whitespace/metadata.unit b/test/whitespace/metadata.unit
index 29335fa1715506fe824d7f40532f9870f6773df7..292e8c865352b8e8c8c9b610fdd38205f5162c49 100644
--- a/test/whitespace/metadata.unit
+++ b/test/whitespace/metadata.unit
@@ -225,4 +225,10 @@ positional([@foo bar]) {}
 named({@foo bar}) {}
 <<<
 positional([@foo bar]) {}
-named({@foo bar}) {}
+named({@foo bar}) {}
+>>> split between metadata and parameter indents
+function(@VeryLongMetadataAnnotation longParameter) {}
+<<<
+function(
+    @VeryLongMetadataAnnotation
+        longParameter) {}