Function rustc_typeck::check::cast::make_invalid_casting_error

fn make_invalid_casting_error<'a, 'tcx>(
    sess: &'a Session, 
    span: Span, 
    expr_ty: Ty<'tcx>, 
    cast_ty: Ty<'tcx>, 
    fcx: &FnCtxt<'a, 'tcx>
) -> DiagnosticBuilder<'a>