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Change wording

This commit is contained in:
scalexm 2018-07-09 21:20:26 +02:00
parent f5f97b37a7
commit 37c5c0bf9c
1 changed files with 22 additions and 20 deletions
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42
src/librustc_traits/lowering.rs
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@ -114,15 +114,16 @@ impl<'tcx> Lower<PolyDomainGoal<'tcx>> for ty::Predicate<'tcx> {
}
}
/// Used for lowered where clauses (see rustc guide).
/// Used for implied bounds related rules (see rustc guide).
trait IntoFromEnvGoal {
// Transforms an existing goal into a FromEnv goal.
/// Transforms an existing goal into a `FromEnv` goal.
fn into_from_env_goal(self) -> Self;
}
/// Used for well-formedness related rules (see rustc guide).
trait IntoWellFormedGoal {
// Transforms an existing goal into a WellFormed goal.
fn into_wellformed_goal(self) -> Self;
/// Transforms an existing goal into a `WellFormed` goal.
fn into_well_formed_goal(self) -> Self;
}
impl<'tcx> IntoFromEnvGoal for DomainGoal<'tcx> {
@ -139,7 +140,7 @@ impl<'tcx> IntoFromEnvGoal for DomainGoal<'tcx> {
}
impl<'tcx> IntoWellFormedGoal for DomainGoal<'tcx> {
fn into_wellformed_goal(self) -> DomainGoal<'tcx> {
fn into_well_formed_goal(self) -> DomainGoal<'tcx> {
use self::WhereClause::*;
match self {
@ -284,34 +285,35 @@ fn program_clauses_for_trait<'a, 'tcx>(
// Rule WellFormed-TraitRef
//
// For each where clause WC:
// Here `WC` denotes the set of all where clauses:
// ```
// forall<Self, P1..Pn> {
// WellFormed(Self: Trait<P1..Pn>) :- Implemented(Self: Trait<P1..Pn>) && WellFormed(WC)
// }
// ```
//Implemented(Self: Trait<P1..Pn>) && WellFormed(WC)
let mut extend_where_clauses = vec![ty::Binder::dummy(trait_pred.lower())];
extend_where_clauses.extend(
where_clauses
.into_iter()
.map(|wc| wc.lower().map_bound(|wc| wc.into_wellformed_goal())),
);
// `Implemented(Self: Trait<P1..Pn>) && WellFormed(WC)`
let wf_conditions = iter::once(ty::Binder::dummy(trait_pred.lower()))
.chain(
where_clauses
.into_iter()
.map(|wc| wc.lower())
.map(|wc| wc.map_bound(|goal| goal.into_well_formed_goal()))
);
// WellFormed(Self: Trait<P1..Pn>) :- Implemented(Self: Trait<P1..Pn>) && WellFormed(WC)
let clause = ProgramClause {
// `WellFormed(Self: Trait<P1..Pn>) :- Implemented(Self: Trait<P1..Pn>) && WellFormed(WC)`
let wf_clause = ProgramClause {
goal: DomainGoal::WellFormed(WellFormed::Trait(trait_pred)),
hypotheses: tcx.mk_goals(
extend_where_clauses
.into_iter()
.map(|wc| Goal::from_poly_domain_goal(wc, tcx)),
wf_conditions.map(|wc| Goal::from_poly_domain_goal(wc, tcx)),
),
};
let wellformed_clauses = iter::once(Clause::ForAll(ty::Binder::dummy(clause)));
let wf_clause = iter::once(Clause::ForAll(ty::Binder::dummy(wf_clause)));
tcx.mk_clauses(
clauses
.chain(implied_bound_clauses)
.chain(wellformed_clauses),
.chain(wf_clause)
)
}