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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
use crate::infer::InferCtxt;
use crate::ty::{self, Ty, TyCtxt, ToPredicate};
use crate::traits::Obligation;
use crate::hir::def_id::DefId;
use super::{ChalkFulfillmentContext, FulfillmentContext, FulfillmentError};
use super::{ObligationCause, PredicateObligation};
pub trait TraitEngine<'tcx>: 'tcx {
fn normalize_projection_type(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
projection_ty: ty::ProjectionTy<'tcx>,
cause: ObligationCause<'tcx>,
) -> Ty<'tcx>;
/// Requires that `ty` must implement the trait with `def_id` in
/// the given environment. This trait must not have any type
/// parameters (except for `Self`).
fn register_bound(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
ty: Ty<'tcx>,
def_id: DefId,
cause: ObligationCause<'tcx>,
) {
let trait_ref = ty::TraitRef {
def_id,
substs: infcx.tcx.mk_substs_trait(ty, &[]),
};
self.register_predicate_obligation(infcx, Obligation {
cause,
recursion_depth: 0,
param_env,
predicate: trait_ref.to_predicate()
});
}
fn register_predicate_obligation(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
obligation: PredicateObligation<'tcx>,
);
fn select_all_or_error(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
) -> Result<(), Vec<FulfillmentError<'tcx>>>;
fn select_where_possible(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
) -> Result<(), Vec<FulfillmentError<'tcx>>>;
fn pending_obligations(&self) -> Vec<PredicateObligation<'tcx>>;
}
pub trait TraitEngineExt<'tcx> {
fn register_predicate_obligations(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>,
);
}
impl<T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
fn register_predicate_obligations(
&mut self,
infcx: &InferCtxt<'_, 'gcx, 'tcx>,
obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>,
) {
for obligation in obligations {
self.register_predicate_obligation(infcx, obligation);
}
}
}
impl dyn TraitEngine<'tcx> {
pub fn new(tcx: TyCtxt<'_, '_, 'tcx>) -> Box<Self> {
if tcx.sess.opts.debugging_opts.chalk {
Box::new(ChalkFulfillmentContext::new())
} else {
Box::new(FulfillmentContext::new())
}
}
}
|
