1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
use std::ops::ControlFlow;
use rustc_data_structures::intern::Interned;
use crate::infer::canonical::QueryRegionConstraints;
use crate::ty::{
FallibleTypeFolder, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeVisitable, TypeVisitor,
};
#[derive(Debug, PartialEq, Eq, Copy, Clone, Hash)]
pub struct ExternalConstraints<'tcx>(pub(crate) Interned<'tcx, ExternalConstraintsData<'tcx>>);
impl<'tcx> std::ops::Deref for ExternalConstraints<'tcx> {
type Target = ExternalConstraintsData<'tcx>;
fn deref(&self) -> &Self::Target {
&*self.0
}
}
/// Additional constraints returned on success.
#[derive(Debug, PartialEq, Eq, Clone, Hash, Default, TypeFoldable, TypeVisitable)]
pub struct ExternalConstraintsData<'tcx> {
// FIXME: implement this.
pub region_constraints: QueryRegionConstraints<'tcx>,
pub opaque_types: Vec<(Ty<'tcx>, Ty<'tcx>)>,
}
// FIXME: Having to clone `region_constraints` for folding feels bad and
// probably isn't great wrt performance.
//
// Not sure how to fix this, maybe we should also intern `opaque_types` and
// `region_constraints` here or something.
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ExternalConstraints<'tcx> {
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
folder: &mut F,
) -> Result<Self, F::Error> {
Ok(FallibleTypeFolder::interner(folder).mk_external_constraints(ExternalConstraintsData {
region_constraints: self.region_constraints.clone().try_fold_with(folder)?,
opaque_types: self
.opaque_types
.iter()
.map(|opaque| opaque.try_fold_with(folder))
.collect::<Result<_, F::Error>>()?,
}))
}
fn fold_with<F: TypeFolder<TyCtxt<'tcx>>>(self, folder: &mut F) -> Self {
TypeFolder::interner(folder).mk_external_constraints(ExternalConstraintsData {
region_constraints: self.region_constraints.clone().fold_with(folder),
opaque_types: self.opaque_types.iter().map(|opaque| opaque.fold_with(folder)).collect(),
})
}
}
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for ExternalConstraints<'tcx> {
fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>(
&self,
visitor: &mut V,
) -> std::ops::ControlFlow<V::BreakTy> {
self.region_constraints.visit_with(visitor)?;
self.opaque_types.visit_with(visitor)?;
ControlFlow::Continue(())
}
}
|
