try_extract_error_from_fulfill_cx

rustc_borrowck::diagnostics::bound_region_errors

Function try_extract_error_from_fulfill_cx 

Source 
fn try_extract_error_from_fulfill_cx<'a, 'tcx>(
    ocx: &ObligationCtxt<'a, 'tcx>,
    generic_param_scope: LocalDefId,
    placeholder_region: Region<'tcx>,
    error_region: Option<Region<'tcx>>,
) -> Option<Diag<'a>>