Function rustc_mir_build::thir::pattern::_match::pat_constructor

fn pat_constructor<'tcx>(
    tcx: TyCtxt<'tcx>, 
    param_env: ParamEnv<'tcx>, 
    pat: &Pat<'tcx>
) -> Option<Constructor<'tcx>>

Determines the constructor that the given pattern can be specialized to. Returns None in case of a catch-all, which can't be specialized.