Rewrite scopes of non-simple default arguments

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 65466559b4be24c52049e3f05e4dea9a10bbe4db..bb365472c7a588e81bdd3544a68141fb1f0ad8fd 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -4613,6 +4613,12 @@ Block* Parser::BuildParameterInitializationBlock(
       param_block = factory()->NewBlock(NULL, 8, true, RelocInfo::kNoPosition);
       param_block->set_scope(param_scope);
       descriptor.hoist_scope = scope_;
+      // Pass the appropriate scope in so that PatternRewriter can appropriately
+      // rewrite inner initializers of the pattern to param_scope
+      descriptor.scope = param_scope;
+      // Rewrite the outer initializer to point to param_scope
+      RewriteParameterInitializerScope(stack_limit(), initial_value, scope_,
+                                       param_scope);
     }
 
     {