Function rustc_mir_build::thir::pattern::check_match::check_let_reachability

fn check_let_reachability<'p, 'tcx>(
    cx: &mut MatchCheckCtxt<'p, 'tcx>, 
    ls: LetSource, 
    pat_id: HirId, 
    pat: &'p Pat<'tcx>, 
    span: Span
)