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add some more tests and test comments
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2 files changed

+90
-4
lines changed

2 files changed

+90
-4
lines changed

‎chalk-ir/src/debug.rs

+1
Original file line numberDiff line numberDiff line change
@@ -210,6 +210,7 @@ impl<I: Interner> Debug for DynTy<I> {
210210
write!(fmt, "dyn {:?} + {:?}", bounds, lifetime)
211211
}
212212
}
213+
213214
impl Debug for InferenceVar {
214215
fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), Error> {
215216
write!(fmt, "?{}", self.index)

‎tests/test/builtin_impls/unsize.rs

+89-4
Original file line numberDiff line numberDiff line change
@@ -29,6 +29,7 @@ fn dyn_to_dyn_unsizing() {
2929
trait Auto3 {}
3030
}
3131

32+
// Tests with the same principal and auto traits
3233
goal {
3334
forall<'a> {
3435
forall<'b> {
@@ -39,6 +40,17 @@ fn dyn_to_dyn_unsizing() {
3940
"Unique; substitution [], lifetime constraints [InEnvironment { environment: Env([]), goal: '!1_0: '!2_0 }]"
4041
}
4142

43+
goal {
44+
forall<'a> {
45+
forall<'b> {
46+
dyn Principal + Auto1 + Auto2 + Auto3 + 'a: Unsize<dyn Principal + Auto1 + Auto2 + Auto3 + 'b>
47+
}
48+
}
49+
} yields {
50+
"Unique; substitution [], lifetime constraints [InEnvironment { environment: Env([]), goal: '!1_0: '!2_0 }]"
51+
}
52+
53+
// Target has a subset of source auto traits
4254
goal {
4355
forall<'a> {
4456
dyn Principal + Auto1 + Auto2 + 'a: Unsize<dyn Principal + Auto1 + 'a>
@@ -47,6 +59,7 @@ fn dyn_to_dyn_unsizing() {
4759
"Unique; substitution [], lifetime constraints [InEnvironment { environment: Env([]), goal: '!1_0: '!1_0 }]"
4860
}
4961

62+
// Both target and source don't have principal as their first trait
5063
goal {
5164
forall<'a> {
5265
dyn Auto1 + Principal + 'a: Unsize<dyn Auto1 + Principal + 'a>
@@ -55,6 +68,7 @@ fn dyn_to_dyn_unsizing() {
5568
"Unique; substitution [], lifetime constraints [InEnvironment { environment: Env([]), goal: '!1_0: '!1_0 }]"
5669
}
5770

71+
// Different order of traits in target and source
5872
// FIXME: this doesn't work because trait object unification
5973
// respects where clause order, which it shouldn't
6074
goal {
@@ -65,7 +79,7 @@ fn dyn_to_dyn_unsizing() {
6579
"No possible solution"
6680
}
6781

68-
// Same as above
82+
// See above
6983
goal {
7084
forall<'a> {
7185
dyn Principal + Auto2 + Auto1 + 'a: Unsize<dyn Principal + Auto1 + Auto2 + 'a>
@@ -74,6 +88,7 @@ fn dyn_to_dyn_unsizing() {
7488
"No possible solution"
7589
}
7690

91+
// Source has a subset of auto traits of target
7792
goal {
7893
forall<'a> {
7994
dyn Principal + Auto2 + 'a: Unsize<dyn Principal + Auto1 + Auto2 + 'a>
@@ -82,6 +97,7 @@ fn dyn_to_dyn_unsizing() {
8297
"No possible solution"
8398
}
8499

100+
// Source and target have different set of auto traits
85101
goal {
86102
forall<'a> {
87103
dyn Principal + Auto1 + Auto2 + 'a: Unsize<dyn Principal + Auto1 + Auto3 + 'a>
@@ -90,6 +106,7 @@ fn dyn_to_dyn_unsizing() {
90106
"No possible solution"
91107
}
92108

109+
// Source has a principal trait, while target doesnt, both have the same auto traits.
93110
goal {
94111
forall<'a> {
95112
dyn Principal + Auto1 + 'a: Unsize<dyn Auto1 + 'a>
@@ -98,6 +115,7 @@ fn dyn_to_dyn_unsizing() {
98115
"No possible solution"
99116
}
100117

118+
// Non-matching principal traits
101119
goal {
102120
forall<'a> {
103121
dyn Principal + 'a: Unsize<dyn OtherPrincipal + 'a>
@@ -106,6 +124,7 @@ fn dyn_to_dyn_unsizing() {
106124
"No possible solution"
107125
}
108126

127+
// Matching generic principal traits
109128
goal {
110129
forall<'a> {
111130
dyn GenericPrincipal<u64, Item = u64> + 'a: Unsize<dyn GenericPrincipal<u64, Item = u64> + 'a>
@@ -114,6 +133,7 @@ fn dyn_to_dyn_unsizing() {
114133
"Unique; substitution [], lifetime constraints [InEnvironment { environment: Env([]), goal: '!1_0: '!1_0 }]"
115134
}
116135

136+
// Non-matching generic principal traits
117137
goal {
118138
forall<'a> {
119139
dyn GenericPrincipal<u32, Item = u32> + 'a: Unsize<dyn GenericPrincipal<u32, Item = u64> + 'a>
@@ -147,21 +167,21 @@ fn ty_to_dyn_unsizing() {
147167
trait Auto {}
148168

149169
struct Foo {}
170+
struct FooLifetime<'a> {}
150171
struct Bar {}
151172
struct Baz {}
152173
struct FooNotSized<T> {
153174
t: T
154175
}
155176

156177
impl Principal for Foo {}
157-
impl Auto for Foo {}
158178
impl UnsafePrincipal for Foo {}
159179

180+
impl<'a> Principal for FooLifetime<'a> {}
181+
160182
impl Principal for Bar {}
161183
impl !Auto for Bar {}
162184

163-
impl Auto for Baz {}
164-
165185
impl<T> Principal for FooNotSized<T> {}
166186

167187
impl GenericPrincipal<u32> for Foo {
@@ -177,6 +197,7 @@ fn ty_to_dyn_unsizing() {
177197
"Unique; substitution [], lifetime constraints []"
178198
}
179199

200+
// Principal is not the first trait
180201
goal {
181202
forall<'a> {
182203
Foo: Unsize<dyn Auto + Principal + 'a>
@@ -185,6 +206,7 @@ fn ty_to_dyn_unsizing() {
185206
"Unique; substitution [], lifetime constraints []"
186207
}
187208

209+
// Auto-only trait object
188210
goal {
189211
forall<'a> {
190212
Foo: Unsize<dyn Auto + 'a>
@@ -193,6 +215,38 @@ fn ty_to_dyn_unsizing() {
193215
"Unique; substitution [], lifetime constraints []"
194216
}
195217

218+
// TypeOutlives tests
219+
goal {
220+
forall<'a> {
221+
FooLifetime<'a>: Unsize<dyn Principal + Auto + 'a>
222+
}
223+
} yields {
224+
"Unique; substitution [], lifetime constraints []"
225+
}
226+
227+
// FIXME: this shouldn't be provable, but currently
228+
// we have no `TypeOutlives` goal to check it
229+
goal {
230+
forall<'a, 'b> {
231+
FooLifetime<'a>: Unsize<dyn Principal + Auto + 'b>
232+
}
233+
} yields {
234+
"Unique; substitution [], lifetime constraints []"
235+
}
236+
237+
// This should produce 'a: 'b constraint, but for the reasons
238+
// above it doesn't
239+
goal {
240+
forall<'a> {
241+
exists<'b> {
242+
FooLifetime<'a>: Unsize<dyn Principal + Auto + 'b>
243+
}
244+
}
245+
} yields {
246+
"Unique; for<?U1> { substitution [?0 := '^0.0], lifetime constraints [] }"
247+
}
248+
249+
// Source does not implement auto trait (with principal)
196250
goal {
197251
forall<'a> {
198252
Bar: Unsize<dyn Principal + Auto + 'a>
@@ -201,6 +255,16 @@ fn ty_to_dyn_unsizing() {
201255
"No possible solution"
202256
}
203257

258+
// Source does not implement auto trait (without principal)
259+
goal {
260+
forall<'a> {
261+
Bar: Unsize<dyn Auto + 'a>
262+
}
263+
} yields {
264+
"No possible solution"
265+
}
266+
267+
// Source does not implement principal
204268
goal {
205269
forall<'a> {
206270
Baz: Unsize<dyn Principal + Auto + 'a>
@@ -209,6 +273,7 @@ fn ty_to_dyn_unsizing() {
209273
"No possible solution"
210274
}
211275

276+
// Implemeted generic principal
212277
goal {
213278
forall<'a> {
214279
Foo: Unsize<dyn GenericPrincipal<u32, Item = u32> + 'a>
@@ -217,6 +282,8 @@ fn ty_to_dyn_unsizing() {
217282
"Unique; substitution [], lifetime constraints []"
218283
}
219284

285+
286+
// Non-implemeted generic principal
220287
goal {
221288
forall<'a> {
222289
Foo: Unsize<dyn GenericPrincipal<u32, Item = u64> + 'a>
@@ -225,6 +292,7 @@ fn ty_to_dyn_unsizing() {
225292
"No possible solution"
226293
}
227294

295+
// Not object-safe principal trait
228296
goal {
229297
forall<'a> {
230298
Foo: Unsize<dyn UnsafePrincipal + 'a>
@@ -233,6 +301,7 @@ fn ty_to_dyn_unsizing() {
233301
"No possible solution"
234302
}
235303

304+
// Source ty is not Sized
236305
goal {
237306
forall<'a> {
238307
forall<T> {
@@ -243,6 +312,7 @@ fn ty_to_dyn_unsizing() {
243312
"No possible solution"
244313
}
245314

315+
// Sized counterpart for the previous test
246316
goal {
247317
forall<'a> {
248318
forall<T> {
@@ -296,6 +366,7 @@ fn tuple_unsizing() {
296366
"Unique; substitution [], lifetime constraints []"
297367
}
298368

369+
// Last field does not implement `Unsize`
299370
goal {
300371
forall<'a> {
301372
(u32, Foo): Unsize<(u32, dyn OtherPrincipal + 'a)>
@@ -304,6 +375,7 @@ fn tuple_unsizing() {
304375
"No possible solution"
305376
}
306377

378+
// Mismatch of head fields
307379
goal {
308380
forall<'a> {
309381
(u32, Foo): Unsize<(u64, dyn Principal + 'a)>
@@ -312,6 +384,7 @@ fn tuple_unsizing() {
312384
"No possible solution"
313385
}
314386

387+
// Tuple length mismatch
315388
goal {
316389
forall<'a> {
317390
(u32, u32, Foo): Unsize<(u32, dyn Principal + 'a)>
@@ -320,6 +393,7 @@ fn tuple_unsizing() {
320393
"No possible solution"
321394
}
322395

396+
// Multilevel tuple test
323397
goal {
324398
forall<'a> {
325399
(u32, (u32, Foo)): Unsize<(u32, (u32, dyn Principal + 'a))>
@@ -424,6 +498,7 @@ fn struct_unsizing() {
424498
impl Principal for Foo {}
425499
}
426500

501+
// Single field struct tests
427502
goal {
428503
Foo: Unsize<Foo>
429504
} yields {
@@ -446,6 +521,7 @@ fn struct_unsizing() {
446521
"No possible solution"
447522
}
448523

524+
// Unsizing parameter is used in head fields
449525
goal {
450526
forall<'a> {
451527
SParamsInMultipleFields<Foo>:
@@ -455,6 +531,7 @@ fn struct_unsizing() {
455531
"No possible solution"
456532
}
457533

534+
// Two-field struct test
458535
goal {
459536
forall<'a> {
460537
S12<Foo, Foo>: Unsize<S12<Foo, dyn Principal + 'a>>
@@ -463,6 +540,8 @@ fn struct_unsizing() {
463540
"Unique; substitution [], lifetime constraints []"
464541
}
465542

543+
// Test for the unsizing parameters collector
544+
// (checking that it ignores the binder inside `SWithBinders`)
466545
goal {
467546
forall<'a> {
468547
SWithBinders<Foo, Foo>: Unsize<SWithBinders<dyn Principal + 'a, Foo>>
@@ -471,6 +550,7 @@ fn struct_unsizing() {
471550
"Unique; substitution [], lifetime constraints []"
472551
}
473552

553+
// Non-trivial unsizing of the last field
474554
goal {
475555
forall<'a> {
476556
SNested<Foo, Bar<Foo>, Foo>: Unsize<SNested<Foo, Bar<Foo>, dyn Principal + 'a>>
@@ -487,6 +567,7 @@ fn struct_unsizing() {
487567
"No possible solution"
488568
}
489569

570+
// Check that lifetimes can't be used as unsizing parameters
490571
goal {
491572
forall<'a> {
492573
SLifetime<'a, Foo>: Unsize<SLifetime<'a, dyn Principal + 'a>>
@@ -495,18 +576,22 @@ fn struct_unsizing() {
495576
"Unique; substitution [], lifetime constraints []"
496577
}
497578

579+
// Tests with constant as an unsizing parameter
498580
goal {
499581
SGoodConst<5, [u32; 2]>: Unsize<SGoodConst<5, [u32]>>
500582
} yields {
501583
"Unique; substitution [], lifetime constraints []"
502584
}
503585

586+
587+
// Target does not match source
504588
goal {
505589
SGoodConst<4, [u32; 2]>: Unsize<SGoodConst<5, [u32]>>
506590
} yields {
507591
"No possible solution"
508592
}
509593

594+
// Unsizing parameter is used in head fields
510595
goal {
511596
SBadConst<5, [u32; 2]>: Unsize<SBadConst<5, [u32]>>
512597
} yields {

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