When parsing an invalid write, still add to the local table

src/prism.c

@@ -13695,7 +13695,7 @@ parse_unwriteable_write(pm_parser_t *parser, pm_node_t *target, const pm_token_t
         default: break;
     }
 
-    pm_constant_id_t name = pm_parser_constant_id_location(parser, target->location.start, target->location.end);
+    pm_constant_id_t name = pm_parser_local_add_location(parser, target->location.start, target->location.end, 1);
     pm_local_variable_write_node_t *result = pm_local_variable_write_node_create(parser, name, 0, value, &target->location, equals);
 
     pm_node_destroy(parser, target);

test/prism/locals_test.rb

@@ -9,6 +9,11 @@
 # to test on the most recent versions.
 return if !defined?(RubyVM::InstructionSequence) || RUBY_VERSION < "3.4.0"
 
+# In Ruby 3.4.0, the local table for method forwarding changed. But 3.4.0 can
+# refer to the dev version, so while 3.4.0 still isn't released, we need to
+# check if we have a high enough revision.
+return if RubyVM::InstructionSequence.compile("def foo(...); end").to_a[13][2][2][10].length != 1
+
 # Omit tests if running on a 32-bit machine because there is a bug with how
 # Ruby is handling large ISeqs on 32-bit machines
 return if RUBY_PLATFORM =~ /i686/