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bors 32e7a4b92b Auto merge of #144405 - lcnr:hir-typeck-uniquify, r=BoxyUwU 
uniquify root goals during HIR typeck

We need to rely on region identity to deal with hangs such as https://github.com/rust-lang/trait-system-refactor-initiative/issues/210 and to keep the current behavior of `fn try_merge_responses`.

This is a problem as borrowck starts by replacing each *occurrence* of a region with a unique inference variable. This frequently splits a single region during HIR typeck into multiple distinct regions. As we assume goals to always succeed during borrowck, relying on two occurances of a region being identical during HIR typeck causes ICE. See the now fixed examples in https://github.com/rust-lang/trait-system-refactor-initiative/issues/27 and rust-lang/rust#139409.

We've previously tried to avoid this issue by always *uniquifying* regions when canonicalizing goals. This prevents caching subtrees during canonicalization which resulted in hangs for very large types. People rely on such types in practice, which caused us to revert our attempt to reinstate `#[type_length_limit]` in https://github.com/rust-lang/rust/pull/127670. The complete list of changes here:
- rust-lang/rust#107981
- rust-lang/rust#110180
- rust-lang/rust#114117
- rust-lang/rust#130821

After more consideration, all occurrences of such large types need to happen outside of typeck/borrowck. We know this as we already walk over all types in the MIR body when replacing their regions with nll vars.

This PR therefore enables us to rely on region identity inside of the trait solver by exclusively **uniquifying root goals during HIR typeck**. These are the only goals we assume to hold during borrowck. This is insufficient as type inference variables may "hide" regions we later uniquify. Because of this, we now stash proven goals which depend on inference variables in HIR typeck and reprove them after writeback. This closes https://github.com/rust-lang/trait-system-refactor-initiative/issues/127.

This was originally part of rust-lang/rust#144258 but I've moved it into a separate PR. While I believe we need to rely on region identity to fix the performance issues in some way, I don't know whether rust-lang/rust#144258 is the best approach to actually do so. Regardless of how we deal with the hangs however, this change is necessary and desirable regardless.

r? `@compiler-errors` or `@BoxyUwU`
2025-07-31 00:32:55 +00:00
..
auxiliary Fix tests 2025-05-21 20:20:19 +01:00
34127.rs Fix tests that rely on LLVM IR verification 2024-11-29 19:11:34 +01:00
54888.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
87577.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
88296.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
92004.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
92470.rs crashes: add more tests 2024-04-26 17:20:16 +02:00
93182.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
93237.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
94846.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
95134.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
98322.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
100041.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
101036.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
101557.rs crashes: fix ice detection which did not trigger if code compiled without error by accident 2024-04-14 11:21:58 +02:00
102047.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
102252.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
103708.rs add more known-crashes tests 2024-04-19 23:09:37 +02:00
104685.rs add more known-crashes tests 2024-04-19 23:09:37 +02:00
105238-1.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
105238-2.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
105275.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
105937.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
106473.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
108428.rs add two old crash tests 2025-01-25 23:40:35 +01:00
108499.rs crashes: add a couple more tests 2024-04-18 18:55:20 +02:00
108814.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
110378.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
110534.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
110627.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
111419.rs stabilize gai 2025-06-11 15:30:15 +01:00
111742.rs add .rs crashes from https://github.com/rust-lang/glacier 2024-04-14 11:18:23 +02:00
113846.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
114198-2.rs Remove mono item collection strategy override from -Zprint-mono-items 2025-05-09 12:19:09 +02:00
114198.rs Remove mono item collection strategy override from -Zprint-mono-items 2025-05-09 12:19:09 +02:00
114212-2.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
114212.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
114663.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
114920.rs crashes: add a couple more tests 2024-04-18 18:55:20 +02:00
115435.rs crashes: fix ice detection which did not trigger if code compiled without error by accident 2024-04-14 11:21:58 +02:00
116519-2.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
116519.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
116554.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
116947.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117392-2.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117392.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117460.rs add crashtests for several old unfixed ICEs 2024-08-30 12:50:07 +02:00
117496.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117629.rs parse const trait Trait 2025-07-17 18:06:26 +08:00
117696-1.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117696-2.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117795.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
117808.rs add some debug-assertion crash tests 2024-12-08 14:17:25 +01:00
118038.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
118244.rs add more known-crashes tests 2024-04-19 23:09:37 +02:00
118590.rs crashes: add a couple more tests 2024-04-18 18:55:20 +02:00
118603.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
118778.rs add some debug-assertion crash tests 2024-12-08 14:17:25 +01:00
118784.rs add some debug-assertion crash tests 2024-12-08 14:17:25 +01:00
118952-2.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
118952.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
119095.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
119692.rs crashes: fix ice detection which did not trigger if code compiled without error by accident 2024-04-14 11:21:58 +02:00
119729.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
119783.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
119786.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
119824.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
120016.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
120033.rs tests: {Meta,Pointee}Sized in non-minicore tests 2025-06-16 23:04:33 +00:00
120175.rs add some debug-assertion crash tests 2024-12-08 14:17:25 +01:00
120254.rs crashes: add a couple more tests 2024-04-18 18:55:20 +02:00
120811.rs crashes: add even more tests?!? 2024-04-18 06:13:47 +02:00
120873.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
120911.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
121575.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
121858.rs Partially implement ConstArgHasType 2024-05-29 17:06:54 +01:00
121963.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
122259.rs crashes: add a couple more tests 2024-04-18 18:55:20 +02:00
122529.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
122630.rs crashes: add a couple more tests 2024-04-18 18:55:20 +02:00
122681.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
122710.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
122823.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
122903-1.rs Adjust crash bug to still reproduce. 2024-05-31 11:04:32 +00:00
122904-2.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
123140.rs tests/crashes: add ICEs from matthiaskrgr/glacier2 2024-04-14 11:21:51 +02:00
123157.rs crashes: fix ice detection which did not trigger if code compiled without error by accident 2024-04-14 11:21:58 +02:00
123629.rs add a few more crashtests 2024-09-01 22:28:23 +02:00
123690.rs crashes: add even more tests?!? 2024-04-18 06:13:47 +02:00
123810.rs crashes: add even more tests?!? 2024-04-18 06:13:47 +02:00
123862.rs add some debug-assertion crash tests 2024-12-08 14:17:25 +01:00
123887.rs crashes: increment the number of tracked ones 2024-05-27 17:32:56 +02:00
123959.rs crashes: add even more tests?!? 2024-04-18 06:13:47 +02:00
124189.rs crashes: add a couple more ICE tests 2024-04-21 21:04:32 +02:00
124340.rs crashes: add more tests 2024-04-26 17:20:16 +02:00
124352.rs crashes: add more tests 2024-04-26 17:20:16 +02:00
124440.rs crashes: add lastest batch of crash tests 2024-05-05 23:41:08 +02:00
124751.rs Stabilize the 2024 edition 2024-11-22 11:12:15 -08:00
125014.rs crashes: increment the number of tracked ones 2024-05-27 17:32:56 +02:00
125185.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
125323.rs crashes: increment the number of tracked ones 2024-05-27 17:32:56 +02:00
125553.rs remove fixed crashes, add fixed crashes to tests, add new cashed found in the meantime 2024-05-27 20:41:09 +02:00
125680.rs tests: add more crashes 2024-06-09 10:16:12 +02:00
125768.rs tests: add more crashes 2024-06-09 10:16:12 +02:00
125769.rs tests: add more crashes 2024-06-09 10:16:12 +02:00
125772.rs tests: add more crashes 2024-06-09 10:16:12 +02:00
125801.rs tests: add more crashes 2024-06-09 10:16:12 +02:00
125841.rs tests: add more crashes 2024-06-09 10:16:12 +02:00
126268.rs add and update some crashtests 2024-11-02 23:44:12 +01:00
126443.rs add crashtests for several old unfixed ICEs 2024-08-30 12:50:07 +02:00
126667.rs crashes: add more tests 2024-06-29 09:33:28 +02:00
126680.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
126696.rs crashes: add more tests 2024-06-29 09:33:28 +02:00
127033.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
127643.rs Crashes tests 2025-05-01 20:05:07 +01:00
127972.rs Retroactively feature gate ConstArgKind::Path 2024-08-19 01:14:22 +01:00
129095.rs Check signature WF when lowering MIR body 2025-03-03 23:09:42 +00:00
129209.rs crashes: more tests 2024-08-19 00:38:28 +02:00
129425.rs couple more crash tests 2024-08-30 12:38:22 +02:00
129556.rs couple more crash tests 2024-08-30 12:38:22 +02:00
130104.rs tests: s/C-cmse/cmse/ 2025-06-25 00:52:10 -07:00
130310.rs Revert "Add recursion limit to FFI safety lint" 2024-09-23 12:43:44 -04:00
130346.rs tests: more ice tests 2024-09-15 21:18:41 +02:00
130395.rs add some debug-assertion crash tests 2024-12-08 14:17:25 +01:00
130411.rs more crash tests 2024-09-18 00:10:25 +02:00
130524.rs crashes: more tests 2024-09-29 11:58:09 +02:00
130797.rs crashes: more tests 2024-12-15 17:27:52 +01:00
131046.rs add more crash tests 2024-10-09 15:34:45 +02:00
131052.rs add more crash tests 2024-10-09 15:34:45 +02:00
131292.rs add more crash tests 2024-10-09 15:34:45 +02:00
131295.rs add more crash tests 2024-10-09 15:34:45 +02:00
131342.rs Emit warning when calling/declaring functions with unavailable vectors. 2024-11-01 22:24:35 +01:00
131373.rs add more crash tests 2024-10-09 15:34:45 +02:00
131406.rs add more crash tests 2024-10-09 15:34:45 +02:00
131534.rs add latest crash tests 2024-10-12 11:29:38 +02:00
131762.rs add latest crash tests 2024-10-20 10:05:39 +02:00
131787.rs add latest crash tests 2024-10-20 10:05:39 +02:00
131886.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
132126.rs add and update some crashtests 2024-11-02 23:44:12 +01:00
132142.rs tests: s/C-cmse/cmse/ 2025-06-25 00:52:10 -07:00
132765.rs crashes: more tests 2024-12-12 22:09:39 +01:00
132960.rs Check signature WF when lowering MIR body 2025-03-03 23:09:42 +00:00
132985.rs Introduce min_generic_const_args and directly represent paths 2024-11-19 05:07:43 +00:00
133613.rs crashes: more tests 2024-12-15 17:27:52 +01:00
133965.rs crashes: more tests v2 2024-12-12 22:55:31 +01:00
133966.rs crashes: more tests v2 2024-12-12 22:55:31 +01:00
134061.rs crashes: more tests v2 2024-12-12 22:55:31 +01:00
134174.rs crashes: more tests 2024-12-15 17:27:52 +01:00
134479.rs crashes: add latest batch of tests 2025-01-04 14:38:06 +01:00
134587.rs crashes: add latest batch of tests 2025-01-04 14:38:06 +01:00
134615.rs crashes: add latest batch of tests 2025-01-04 14:38:06 +01:00
134641.rs crashes: add latest batch of tests 2025-01-04 14:38:06 +01:00
134654.rs Check signature WF when lowering MIR body 2025-03-03 23:09:42 +00:00
134838.rs crashes: add latest batch of tests 2025-01-04 14:38:06 +01:00
135122.rs add more crash tests 2025-01-12 10:11:29 +01:00
135470.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
135528.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
135570.rs Check signature WF when lowering MIR body 2025-03-03 23:09:42 +00:00
135617.rs crashes: more tests 2025-02-09 10:40:18 +01:00
135646.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
135718.rs crashes: more tests 2025-02-09 10:40:18 +01:00
135720.rs crashes: more tests 2025-02-09 10:40:18 +01:00
135845.rs crashes: more tests 2025-02-09 10:40:18 +01:00
136063.rs crashes: more tests 2025-02-09 10:40:18 +01:00
136138.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136175-2.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136175.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136188.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136379.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136381.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136416.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136442.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136661.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136666.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136766.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
136859.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137049.rs Implement #[define_opaque] attribute for functions. 2025-03-11 12:05:02 +00:00
137084.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137187.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137190-1.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137190-2.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137190-3.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137260.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137467-1.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
137467-2.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
137467-3.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
137468.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137514.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137580.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137582.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137888.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
137916.rs replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
138008.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
138009.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
138088.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
138089.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
138132.rs crashes: couple more tests 2025-03-08 20:13:07 +01:00
138156.rs crashes: more tests 2025-05-01 17:04:37 +02:00
138361.rs crashes: more tests 2025-05-01 17:04:37 +02:00
138510.rs crashes: more tests 2025-05-01 17:04:37 +02:00
138534.rs crashes: more tests 2025-05-01 17:04:37 +02:00
138564.rs crashes: more tests 2025-05-01 17:04:37 +02:00
138707.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139089.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139120.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139381.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139387.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139462.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139556.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139570.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139596.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139659.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139738.rs crashes: more tests 2025-05-01 17:04:37 +02:00
139815.rs crashes: more tests 2025-05-01 17:04:37 +02:00
140011.rs more ice tests 2025-05-18 17:25:34 +02:00
140099.rs more ice tests 2025-05-18 17:25:34 +02:00
140123-2.rs more ice tests 2025-05-18 17:25:34 +02:00
140123-3.rs more ice tests 2025-05-18 17:25:34 +02:00
140123-4.rs more ice tests 2025-05-18 17:25:34 +02:00
140123.rs more ice tests 2025-05-18 17:25:34 +02:00
140275.rs more ice tests 2025-05-18 17:25:34 +02:00
140303.rs more ice tests 2025-05-18 17:25:34 +02:00
140381.rs more ice tests 2025-05-18 17:25:34 +02:00
140479.rs more ice tests 2025-05-18 17:25:34 +02:00
140577.rs more ice tests 2025-05-18 17:25:34 +02:00
140609.rs more ice tests 2025-05-18 17:25:34 +02:00
140729.rs more ice tests 2025-05-18 17:25:34 +02:00
140850.rs more ice tests 2025-05-18 17:25:34 +02:00
140860.rs more ice tests 2025-05-18 17:25:34 +02:00
140891.rs more ice tests 2025-05-18 17:25:34 +02:00
141124.rs more ice tests 2025-05-18 17:25:34 +02:00
project-to-simd-array-field.rs Rework OperandRef::extract_field to stop calling to_immediate_scalar on things which are already immediates 2025-02-19 12:03:40 -08:00
README.md add note not to re-report crashes from crashes tests 2024-11-06 18:07:47 +01:00

README.md

This is serves as a collection of crashes so that accidental ICE fixes are tracked. This was formally done at https://github.com/rust-lang/glacier but doing it inside the rustc testsuite is more convenient.

It is imperative that a test in the suite causes an internal compiler error/panic or makes rustc crash in some other way. A test will "pass" if rustc exits with something other than 1 or 0.

When adding crashes from https://github.com/rust-lang/rust/issues, the issue number should be noted in the file name (12345.rs should suffice) and also inside the file via //@ known-bug #4321 if possible.

If you happen to fix one of the crashes, please move it to a fitting subdirectory in tests/ui and give it a meaningful name. Also please add a doc comment at the top of the file explaining why this test exists. :) Adding Fixes #NNNNN Fixes #MMMMM to the description of your pull request will ensure the corresponding tickets will be closed automatically upon merge. The ticket ids can be found in the file name or the known-bug annotation inside the testfile.

Please do not re-report any crashes that you find here!