merge revision(s) ddb32e66160ab50849419ef7c7ac584913b79c34: [Backport #18173]

	[Bug #18173] Update loaded_features_index

	If $LOADED_FEATURES is changed in the just required file, also the
	index table needs to be updated before loaded_features_snapshot is
	reset.  If the snapshot is reset without updating the table, the
	name of the added feature will not be found.
	---
	 load.c                    |  1 +
	 test/ruby/test_require.rb | 17 +++++++++++++++++
	 2 files changed, 18 insertions(+)

1 files changed, 1 insertions, 0 deletions

diff --git a/load.c b/load.c
index 2d931b91f0..e5b0ff435d 100644
--- a/load.c
+++ b/load.c
@@ -606,6 +606,7 @@ rb_provide_feature(VALUE feature)
     }
     rb_str_freeze(feature);
 
+    get_loaded_features_index();
     rb_ary_push(features, rb_fstring(feature));
     features_index_add(feature, INT2FIX(RARRAY_LEN(features)-1));
     reset_loaded_features_snapshot();