rustc_trait_selection::error_reporting::infer::region

Function msg_span_from_named_region

Source 
fn msg_span_from_named_region<'tcx>(
    tcx: TyCtxt<'tcx>,
    generic_param_scope: LocalDefId,
    region: Region<'tcx>,
    alt_span: Option<Span>,
) -> (String, Option<Span>)