Allow arguments before and after block-formatted functions.

lib/src/source_visitor.dart

Index: lib/src/source_visitor.dart
diff --git a/lib/src/source_visitor.dart b/lib/src/source_visitor.dart
index 3e7c3dca65ff8d832063fbc31e60845416ff8ad9..a59ff5e1d968a17684588025df60868ed6e2beb5 100644
--- a/lib/src/source_visitor.dart
+++ b/lib/src/source_visitor.dart
@@ -1676,6 +1676,10 @@ class SourceVisitor implements AstVisitor {
     if (elements.isEmpty && rightBracket.precedingComments == null) {
       token(leftBracket);
       token(rightBracket);
+
+      // Clear this out in case this empty collection is in an argument list.
+      // We don't want this rule to bleed over to some other collection.
+      _nextLiteralBodyRule = null;
       return;
     }