Function rustc_borrowck::diagnostics::bound_region_errors::try_extract_error_from_region_constraints

fn try_extract_error_from_region_constraints<'a, 'tcx>(
    infcx: &'a InferCtxt<'tcx>,
    generic_param_scope: LocalDefId,
    placeholder_region: Region<'tcx>,
    error_region: Option<Region<'tcx>>,
    region_constraints: &RegionConstraintData<'tcx>,
    region_var_origin: impl FnMut(RegionVid) -> RegionVariableOrigin,
    universe_of_region: impl FnMut(RegionVid) -> UniverseIndex,
) -> Option<Diag<'a>>