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// Copyright 2014 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. //! Experimental types for the trait query interface. The methods //! defined in this module are all based on **canonicalization**, //! which makes a canonical query by replacing unbound inference //! variables and regions, so that results can be reused more broadly. //! The providers for the queries defined here can be found in //! `librustc_traits`. use infer::canonical::Canonical; use ty::{self, Ty}; pub mod dropck_outlives; pub mod evaluate_obligation; pub mod normalize; pub mod normalize_erasing_regions; pub type CanonicalProjectionGoal<'tcx> = Canonical<'tcx, ty::ParamEnvAnd<'tcx, ty::ProjectionTy<'tcx>>>; pub type CanonicalTyGoal<'tcx> = Canonical<'tcx, ty::ParamEnvAnd<'tcx, Ty<'tcx>>>; pub type CanonicalPredicateGoal<'tcx> = Canonical<'tcx, ty::ParamEnvAnd<'tcx, ty::Predicate<'tcx>>>; #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)] pub struct NoSolution; pub type Fallible<T> = Result<T, NoSolution>; impl_stable_hash_for!(struct NoSolution { });