Fix local table size and index for required post underscore

Co-Authored-By: Matt Valentine-House <matt@eightbitraptor.com>

prism_compile.c

@@ -6372,7 +6372,7 @@ pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret,
                 // additional anonymous local not represented in the locals table
                 // We want to account for this in our table size
                 pm_node_t *required = posts_list->nodes[i];
-                if (PM_NODE_TYPE_P(required, PM_MULTI_TARGET_NODE)) {
+                if (PM_NODE_TYPE_P(required, PM_MULTI_TARGET_NODE) || PM_NODE_FLAG_P(required, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                     table_size++;
                 }
             }
@@ -6541,8 +6541,14 @@ pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret,
                   //                                   ^
                   case PM_REQUIRED_PARAMETER_NODE: {
                     pm_required_parameter_node_t * param = (pm_required_parameter_node_t *)post_node;
+                    if (PM_NODE_FLAG_P(param, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
+                        ID local = pm_constant_id_lookup(scope_node, param->name);
+                        local_table_for_iseq->ids[local_index] = local;
+                    }
+                    else {
 
-                    pm_insert_local_index(param->name, local_index, index_lookup_table, local_table_for_iseq, scope_node);
+                        pm_insert_local_index(param->name, local_index, index_lookup_table, local_table_for_iseq, scope_node);
+                    }
                     break;
                   }
                   default: {

test/ruby/test_compile_prism.rb

@@ -1545,6 +1545,10 @@ a
       CODE
     end
 
+    def test_repeated_required_post_underscore
+      assert_prism_eval("def self.m(_, _, *_, _); _; end; method(:m).parameters")
+    end
+
     def test_repeated_splat_underscore
       assert_prism_eval("def self.m(_, _, _ = 1, _ = 2, *_); end; method(:m).parameters")
     end