.map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
}
+ /// Checks whether `expected` is a subtype of `actual`: `expected <: actual`.
+ pub fn sub<T: ToTrace<'tcx>>(
+ &self,
+ cause: &ObligationCause<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ expected: T,
+ actual: T,
+ ) -> Result<(), TypeError<'tcx>> {
+ self.infcx
+ .at(cause, param_env)
+ .sup(expected, actual)
+ .map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
+ }
+
+ /// Checks whether `expected` is a supertype of `actual`: `expected :> actual`.
pub fn sup<T: ToTrace<'tcx>>(
&self,
cause: &ObligationCause<'tcx>,
expected: T,
actual: T,
) -> Result<(), TypeError<'tcx>> {
- match self.infcx.at(cause, param_env).sup(expected, actual) {
- Ok(InferOk { obligations, value: () }) => {
- self.register_obligations(obligations);
- Ok(())
- }
- Err(e) => Err(e),
- }
+ self.infcx
+ .at(cause, param_env)
+ .sup(expected, actual)
+ .map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
}
pub fn select_where_possible(&self) -> Vec<FulfillmentError<'tcx>> {