This means that we're no longer generating the iteration/locking code for each invocation site of iter_results, rather just once per query. This is a 15% win in instruction counts when compiling the rustc_query_impl crate.
This means that we're no longer generating the iteration/locking code for each invocation site of iter_results, rather just once per query. This is a 15% win in instruction counts when compiling the rustc_query_impl crate.