Function rustc_mir_build::thir::pattern::check_match::report_arm_reachability

fn report_arm_reachability<'p, 'tcx>(
    cx: &MatchCheckCtxt<'p, 'tcx>, 
    report: &UsefulnessReport<'p, 'tcx>, 
    source: MatchSource
)

Report unreachable arms, if any.