/
ascribe_user_type.rs
74 lines (64 loc) · 2.11 KB
/
ascribe_user_type.rs
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use infer::canonical::{Canonical, Canonicalized, CanonicalizedQueryResponse, QueryResponse};
use mir::UserTypeAnnotation;
use traits::query::Fallible;
use ty::{self, ParamEnvAnd, Ty, TyCtxt};
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub struct AscribeUserType<'tcx> {
pub mir_ty: Ty<'tcx>,
pub variance: ty::Variance,
pub user_ty: UserTypeAnnotation<'tcx>,
}
impl<'tcx> AscribeUserType<'tcx> {
pub fn new(
mir_ty: Ty<'tcx>,
variance: ty::Variance,
user_ty: UserTypeAnnotation<'tcx>,
) -> Self {
AscribeUserType { mir_ty, variance, user_ty }
}
}
impl<'gcx: 'tcx, 'tcx> super::QueryTypeOp<'gcx, 'tcx> for AscribeUserType<'tcx> {
type QueryResponse = ();
fn try_fast_path(
_tcx: TyCtxt<'_, 'gcx, 'tcx>,
_key: &ParamEnvAnd<'tcx, Self>,
) -> Option<Self::QueryResponse> {
None
}
fn perform_query(
tcx: TyCtxt<'_, 'gcx, 'tcx>,
canonicalized: Canonicalized<'gcx, ParamEnvAnd<'tcx, Self>>,
) -> Fallible<CanonicalizedQueryResponse<'gcx, ()>> {
tcx.type_op_ascribe_user_type(canonicalized)
}
fn shrink_to_tcx_lifetime(
v: &'a CanonicalizedQueryResponse<'gcx, ()>,
) -> &'a Canonical<'tcx, QueryResponse<'tcx, ()>> {
v
}
}
BraceStructTypeFoldableImpl! {
impl<'tcx> TypeFoldable<'tcx> for AscribeUserType<'tcx> {
mir_ty, variance, user_ty
}
}
BraceStructLiftImpl! {
impl<'a, 'tcx> Lift<'tcx> for AscribeUserType<'a> {
type Lifted = AscribeUserType<'tcx>;
mir_ty, variance, user_ty
}
}
impl_stable_hash_for! {
struct AscribeUserType<'tcx> {
mir_ty, variance, user_ty
}
}