| use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse}; |
| use crate::traits::query::Fallible; |
| use rustc::ty::{ParamEnvAnd, TyCtxt}; |
| |
| pub use rustc::traits::query::type_op::Subtype; |
| |
| impl<'tcx> super::QueryTypeOp<'tcx> for Subtype<'tcx> { |
| type QueryResponse = (); |
| |
| fn try_fast_path(_tcx: TyCtxt<'tcx>, key: &ParamEnvAnd<'tcx, Self>) -> Option<()> { |
| if key.value.sub == key.value.sup { Some(()) } else { None } |
| } |
| |
| fn perform_query( |
| tcx: TyCtxt<'tcx>, |
| canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>, |
| ) -> Fallible<CanonicalizedQueryResponse<'tcx, ()>> { |
| tcx.type_op_subtype(canonicalized) |
| } |
| } |