Revert of [ast] Simplify FetchFreeVariables.

src/ast/scopes.h

Index: src/ast/scopes.h
diff --git a/src/ast/scopes.h b/src/ast/scopes.h
index 37c296ce0733ef229b97e9d85b12fbbc1af9dfde..865198e58e58f5bdf36f4aa7ad51ded384342afd 100644
--- a/src/ast/scopes.h
+++ b/src/ast/scopes.h
@@ -520,8 +520,10 @@
 
   // Finds free variables of this scope. This mutates the unresolved variables
   // list along the way, so full resolution cannot be done afterwards.
+  // If a ParseInfo* is passed, non-free variables will be resolved.
   VariableProxy* FetchFreeVariables(DeclarationScope* max_outer_scope,
                                     bool try_to_resolve = true,
+                                    ParseInfo* info = nullptr,
                                     VariableProxy* stack = nullptr);
 
   // Predicates.