https://perf.rust-lang.org/detailed-query.html?commit=e369f6b617bc5124ec5d02626dc1c821589e6eb3&base_commit=4d1241f5158ffd66730e094d8f199ed654ed52ae&benchmark=syn-opt&run_name=patched%20incremental:%20println

This perf run was expected to be a no-op, but appears to have resulted in slightly less queries being run (2 def_span and 2 metadata reads).

cc @eddyb