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Remove Trace
1 parent 89f3651 commit 2bd5050

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3 files changed

+71
-141
lines changed

3 files changed

+71
-141
lines changed

‎compiler/rustc_infer/src/infer/at.rs

+60-126
Original file line numberDiff line numberDiff line change
@@ -48,11 +48,6 @@ pub struct At<'a, 'tcx> {
4848
pub param_env: ty::ParamEnv<'tcx>,
4949
}
5050

51-
pub struct Trace<'a, 'tcx> {
52-
at: At<'a, 'tcx>,
53-
trace: TypeTrace<'tcx>,
54-
}
55-
5651
impl<'tcx> InferCtxt<'tcx> {
5752
#[inline]
5853
pub fn at<'a>(
@@ -109,9 +104,6 @@ impl<'a, 'tcx> At<'a, 'tcx> {
109104
/// call like `foo(x)`, where `foo: fn(i32)`, you might have
110105
/// `sup(i32, x)`, since the "expected" type is the type that
111106
/// appears in the signature.
112-
///
113-
/// See [`At::trace`] and [`Trace::sub`] for a version of
114-
/// this method that only requires `T: Relate<'tcx>`
115107
pub fn sup<T>(
116108
self,
117109
define_opaque_types: DefineOpaqueTypes,
@@ -121,13 +113,19 @@ impl<'a, 'tcx> At<'a, 'tcx> {
121113
where
122114
T: ToTrace<'tcx>,
123115
{
124-
self.trace(expected, actual).sup(define_opaque_types, expected, actual)
116+
let mut fields = CombineFields::new(
117+
self.infcx,
118+
ToTrace::to_trace(self.cause, true, expected, actual),
119+
self.param_env,
120+
define_opaque_types,
121+
);
122+
fields
123+
.sup()
124+
.relate(expected, actual)
125+
.map(|_| InferOk { value: (), obligations: fields.obligations })
125126
}
126127

127128
/// Makes `expected <: actual`.
128-
///
129-
/// See [`At::trace`] and [`Trace::sub`] for a version of
130-
/// this method that only requires `T: Relate<'tcx>`
131129
pub fn sub<T>(
132130
self,
133131
define_opaque_types: DefineOpaqueTypes,
@@ -137,13 +135,19 @@ impl<'a, 'tcx> At<'a, 'tcx> {
137135
where
138136
T: ToTrace<'tcx>,
139137
{
140-
self.trace(expected, actual).sub(define_opaque_types, expected, actual)
138+
let mut fields = CombineFields::new(
139+
self.infcx,
140+
ToTrace::to_trace(self.cause, true, expected, actual),
141+
self.param_env,
142+
define_opaque_types,
143+
);
144+
fields
145+
.sub()
146+
.relate(expected, actual)
147+
.map(|_| InferOk { value: (), obligations: fields.obligations })
141148
}
142149

143-
/// Makes `expected <: actual`.
144-
///
145-
/// See [`At::trace`] and [`Trace::eq`] for a version of
146-
/// this method that only requires `T: Relate<'tcx>`
150+
/// Makes `expected == actual`.
147151
pub fn eq<T>(
148152
self,
149153
define_opaque_types: DefineOpaqueTypes,
@@ -153,7 +157,16 @@ impl<'a, 'tcx> At<'a, 'tcx> {
153157
where
154158
T: ToTrace<'tcx>,
155159
{
156-
self.trace(expected, actual).eq(define_opaque_types, expected, actual)
160+
let mut fields = CombineFields::new(
161+
self.infcx,
162+
ToTrace::to_trace(self.cause, true, expected, actual),
163+
self.param_env,
164+
define_opaque_types,
165+
);
166+
fields
167+
.equate(StructurallyRelateAliases::No)
168+
.relate(expected, actual)
169+
.map(|_| InferOk { value: (), obligations: fields.obligations })
157170
}
158171

159172
/// Equates `expected` and `found` while structurally relating aliases.
@@ -167,10 +180,17 @@ impl<'a, 'tcx> At<'a, 'tcx> {
167180
where
168181
T: ToTrace<'tcx>,
169182
{
170-
self.trace(expected, actual).eq_structurally_relating_aliases(
171-
expected,
172-
actual,
173-
)
183+
assert!(self.infcx.next_trait_solver());
184+
let mut fields = CombineFields::new(
185+
self.infcx,
186+
ToTrace::to_trace(self.cause, true, expected, actual),
187+
self.param_env,
188+
DefineOpaqueTypes::Yes,
189+
);
190+
fields
191+
.equate(StructurallyRelateAliases::Yes)
192+
.relate(expected, actual)
193+
.map(|_| InferOk { value: (), obligations: fields.obligations })
174194
}
175195

176196
pub fn relate<T>(
@@ -202,9 +222,6 @@ impl<'a, 'tcx> At<'a, 'tcx> {
202222
/// this can result in an error (e.g., if asked to compute LUB of
203223
/// u32 and i32), it is meaningful to call one of them the
204224
/// "expected type".
205-
///
206-
/// See [`At::trace`] and [`Trace::lub`] for a version of
207-
/// this method that only requires `T: Relate<'tcx>`
208225
pub fn lub<T>(
209226
self,
210227
define_opaque_types: DefineOpaqueTypes,
@@ -214,15 +231,21 @@ impl<'a, 'tcx> At<'a, 'tcx> {
214231
where
215232
T: ToTrace<'tcx>,
216233
{
217-
self.trace(expected, actual).lub(define_opaque_types, expected, actual)
234+
let mut fields = CombineFields::new(
235+
self.infcx,
236+
ToTrace::to_trace(self.cause, true, expected, actual),
237+
self.param_env,
238+
define_opaque_types,
239+
);
240+
fields
241+
.lub()
242+
.relate(expected, actual)
243+
.map(|value| InferOk { value, obligations: fields.obligations })
218244
}
219245

220246
/// Computes the greatest-lower-bound, or mutual subtype, of two
221247
/// values. As with `lub` order doesn't matter, except for error
222248
/// cases.
223-
///
224-
/// See [`At::trace`] and [`Trace::glb`] for a version of
225-
/// this method that only requires `T: Relate<'tcx>`
226249
pub fn glb<T>(
227250
self,
228251
define_opaque_types: DefineOpaqueTypes,
@@ -232,105 +255,16 @@ impl<'a, 'tcx> At<'a, 'tcx> {
232255
where
233256
T: ToTrace<'tcx>,
234257
{
235-
self.trace(expected, actual).glb(define_opaque_types, expected, actual)
236-
}
237-
238-
/// Sets the "trace" values that will be used for
239-
/// error-reporting, but doesn't actually perform any operation
240-
/// yet (this is useful when you want to set the trace using
241-
/// distinct values from those you wish to operate upon).
242-
pub fn trace<T>(self, expected: T, actual: T) -> Trace<'a, 'tcx>
243-
where
244-
T: ToTrace<'tcx>,
245-
{
246-
let trace = ToTrace::to_trace(self.cause, true, expected, actual);
247-
Trace { at: self, trace }
248-
}
249-
}
250-
251-
impl<'a, 'tcx> Trace<'a, 'tcx> {
252-
/// Makes `a <: b`.
253-
#[instrument(skip(self), level = "debug")]
254-
pub fn sub<T>(self, define_opaque_types: DefineOpaqueTypes, a: T, b: T) -> InferResult<'tcx, ()>
255-
where
256-
T: Relate<'tcx>,
257-
{
258-
let Trace { at, trace } = self;
259-
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
260-
fields
261-
.sub()
262-
.relate(a, b)
263-
.map(move |_| InferOk { value: (), obligations: fields.obligations })
264-
}
265-
266-
/// Makes `a :> b`.
267-
#[instrument(skip(self), level = "debug")]
268-
pub fn sup<T>(self, define_opaque_types: DefineOpaqueTypes, a: T, b: T) -> InferResult<'tcx, ()>
269-
where
270-
T: Relate<'tcx>,
271-
{
272-
let Trace { at, trace } = self;
273-
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
274-
fields
275-
.sup()
276-
.relate(a, b)
277-
.map(move |_| InferOk { value: (), obligations: fields.obligations })
278-
}
279-
280-
/// Makes `a == b`.
281-
#[instrument(skip(self), level = "debug")]
282-
pub fn eq<T>(self, define_opaque_types: DefineOpaqueTypes, a: T, b: T) -> InferResult<'tcx, ()>
283-
where
284-
T: Relate<'tcx>,
285-
{
286-
let Trace { at, trace } = self;
287-
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
288-
fields
289-
.equate(StructurallyRelateAliases::No)
290-
.relate(a, b)
291-
.map(move |_| InferOk { value: (), obligations: fields.obligations })
292-
}
293-
294-
/// Equates `a` and `b` while structurally relating aliases. This should only
295-
/// be used inside of the next generation trait solver when relating rigid aliases.
296-
#[instrument(skip(self), level = "debug")]
297-
pub fn eq_structurally_relating_aliases<T>(self, a: T, b: T) -> InferResult<'tcx, ()>
298-
where
299-
T: Relate<'tcx>,
300-
{
301-
let Trace { at, trace } = self;
302-
debug_assert!(at.infcx.next_trait_solver());
303-
let mut fields = at.infcx.combine_fields(trace, at.param_env, DefineOpaqueTypes::Yes);
304-
fields
305-
.equate(StructurallyRelateAliases::Yes)
306-
.relate(a, b)
307-
.map(move |_| InferOk { value: (), obligations: fields.obligations })
308-
}
309-
310-
#[instrument(skip(self), level = "debug")]
311-
pub fn lub<T>(self, define_opaque_types: DefineOpaqueTypes, a: T, b: T) -> InferResult<'tcx, T>
312-
where
313-
T: Relate<'tcx>,
314-
{
315-
let Trace { at, trace } = self;
316-
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
317-
fields
318-
.lub()
319-
.relate(a, b)
320-
.map(move |t| InferOk { value: t, obligations: fields.obligations })
321-
}
322-
323-
#[instrument(skip(self), level = "debug")]
324-
pub fn glb<T>(self, define_opaque_types: DefineOpaqueTypes, a: T, b: T) -> InferResult<'tcx, T>
325-
where
326-
T: Relate<'tcx>,
327-
{
328-
let Trace { at, trace } = self;
329-
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
258+
let mut fields = CombineFields::new(
259+
self.infcx,
260+
ToTrace::to_trace(self.cause, true, expected, actual),
261+
self.param_env,
262+
define_opaque_types,
263+
);
330264
fields
331265
.glb()
332-
.relate(a, b)
333-
.map(move |t| InferOk { value: t, obligations: fields.obligations })
266+
.relate(expected, actual)
267+
.map(|value| InferOk { value, obligations: fields.obligations })
334268
}
335269
}
336270

‎compiler/rustc_infer/src/infer/mod.rs

-15
Original file line numberDiff line numberDiff line change
@@ -836,21 +836,6 @@ impl<'tcx> InferCtxt<'tcx> {
836836
.collect()
837837
}
838838

839-
fn combine_fields<'a>(
840-
&'a self,
841-
trace: TypeTrace<'tcx>,
842-
param_env: ty::ParamEnv<'tcx>,
843-
define_opaque_types: DefineOpaqueTypes,
844-
) -> CombineFields<'a, 'tcx> {
845-
CombineFields {
846-
infcx: self,
847-
trace,
848-
param_env,
849-
obligations: PredicateObligations::new(),
850-
define_opaque_types,
851-
}
852-
}
853-
854839
pub fn can_sub<T>(&self, param_env: ty::ParamEnv<'tcx>, expected: T, actual: T) -> bool
855840
where
856841
T: at::ToTrace<'tcx>,

‎compiler/rustc_infer/src/infer/relate/combine.rs

+11
Original file line numberDiff line numberDiff line change
@@ -42,6 +42,17 @@ pub struct CombineFields<'infcx, 'tcx> {
4242
pub define_opaque_types: DefineOpaqueTypes,
4343
}
4444

45+
impl<'infcx, 'tcx> CombineFields<'infcx, 'tcx> {
46+
pub fn new(
47+
infcx: &'infcx InferCtxt<'tcx>,
48+
trace: TypeTrace<'tcx>,
49+
param_env: ty::ParamEnv<'tcx>,
50+
define_opaque_types: DefineOpaqueTypes,
51+
) -> Self {
52+
Self { infcx, trace, param_env, define_opaque_types, obligations: vec![] }
53+
}
54+
}
55+
4556
impl<'tcx> InferCtxt<'tcx> {
4657
pub fn super_combine_tys<R>(
4758
&self,

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