[parsing] Fix maybe-assigned flag in some cases.

src/parsing/pattern-rewriter.cc

Index: src/parsing/pattern-rewriter.cc
diff --git a/src/parsing/pattern-rewriter.cc b/src/parsing/pattern-rewriter.cc
index a7f2ed1e2b6959836958a511a1d7b021600c2bc1..f947ad320e2defcf0bdfffe64d298b1dcdf2a7d7 100644
--- a/src/parsing/pattern-rewriter.cc
+++ b/src/parsing/pattern-rewriter.cc
@@ -219,6 +219,7 @@ void Parser::PatternRewriter::VisitVariableProxy(VariableProxy* pattern) {
     // But for var declarations we need to do a new lookup.
     if (descriptor_->mode == VAR) {
       proxy = var_init_scope->NewUnresolved(factory(), name);
+      // TODO(neis): Set is_assigned on proxy.
     } else {
       DCHECK_NOT_NULL(proxy);
       DCHECK_NOT_NULL(proxy->var());