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//! 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::error::TypeError;
use ty::{self, Ty};
pub mod dropck_outlives;
pub mod evaluate_obligation;
pub mod method_autoderef;
pub mod normalize;
pub mod normalize_erasing_regions;
pub mod outlives_bounds;
pub mod type_op;
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>>>;
pub type CanonicalTypeOpAscribeUserTypeGoal<'tcx> =
Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::ascribe_user_type::AscribeUserType<'tcx>>>;
pub type CanonicalTypeOpEqGoal<'tcx> =
Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::eq::Eq<'tcx>>>;
pub type CanonicalTypeOpSubtypeGoal<'tcx> =
Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::subtype::Subtype<'tcx>>>;
pub type CanonicalTypeOpProvePredicateGoal<'tcx> =
Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::prove_predicate::ProvePredicate<'tcx>>>;
pub type CanonicalTypeOpNormalizeGoal<'tcx, T> =
Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::normalize::Normalize<T>>>;
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub struct NoSolution;
pub type Fallible<T> = Result<T, NoSolution>;
impl<'tcx> From<TypeError<'tcx>> for NoSolution {
fn from(_: TypeError<'tcx>) -> NoSolution {
NoSolution
}
}
impl_stable_hash_for!(struct NoSolution { });
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