Remove ReEmpty #98559
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Remove ReEmpty #98559
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ccbond
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☔ The latest upstream changes (presumably #98591) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #98542) made this pull request unmergeable. Please resolve the merge conflicts. |
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Blocked on #98795 and some fiddling with the best way to the |
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☔ The latest upstream changes (presumably #98584) made this pull request unmergeable. Please resolve the merge conflicts. |
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…anup, r=compiler-errors A few cleanups Each commit is (mostly) self-explanatory. These changes have come as I try to remove `ReEmpty` (rust-lang#98559).
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…anup, r=compiler-errors A few cleanups Each commit is (mostly) self-explanatory. These changes have come as I try to remove `ReEmpty` (rust-lang#98559).
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…anup, r=compiler-errors A few cleanups Each commit is (mostly) self-explanatory. These changes have come as I try to remove `ReEmpty` (rust-lang#98559).
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I think this is good to go. The problem I was facing before went away on its own. |
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💔 Test failed - checks-actions |
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The job Click to see the possible cause of the failure (guessed by this bot) |
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cc @compiler-errors ICEy interactions with 🐸 types (RPITIT) |
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I'll look into it this weekend |
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Equate fn outputs when inferring RPITIT hidden types
When we are trying to infer the hidden types for RPITITs, we need to equate the output tys instead of just subtyping them. For example:
```rust
trait Foo { fn bar() -> impl Sized {} }
impl Foo for () { fn bar() -> &'static str { "" } }
```
If we just subtype the signatures `fn() -> &'static str <: fn() -> _#1t` (where `_#1t` is the variable we've used to infer `impl Sized`), we'll end up `&'static str <: _#1t`, which causes us to infer `_#1t = #'_#2r str`, where `'_#2r` is unconstrained, which gets fixed up to `ReEmpty`, and which is certainly not what we want.
I can't actually think of a way to make this fail to compile, because during borrowck we've already done the method probe, and so we just look at the `impl` method signature and see the `&'static str` any time we call `<() as Foo>::bar()`. But this _does_ cause the ICE [here](rust-lang#98559 (comment)) in `@jackh726's` "Remove ReEmpty" PR (rust-lang#98559) to stop ICEing, because after that PR we were leaking unconstrained region variables into the typeck results.
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| (VarValue::Empty(a_ui), VarValue::Empty(b_ui)) => { | ||
| // Empty regions are ordered according to the universe | ||
| // they are associated with. | ||
| a_ui.min(b_ui) == b_ui |
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is this not a >= b ? or am I misunderstanding what min is doing?
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☀️ Test successful - checks-actions |
This was referenced Sep 10, 2022
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Finished benchmarking commit (2287107): comparison URL. Overall result: ✅ improvements - no action needed@rustbot label: -perf-regression Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesThis benchmark run did not return any relevant results for this metric. Footnotes |
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@jackh726 seeing an ICE which bisected to this merge, stacktrace: I will try to produce a MRE |
flip1995
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Remove ReEmpty r? rust-lang/types
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I just tried the latest nightly (2022-10-11) after 1 month and this patch still causes an ICE. Is it something that can be solved easily or planned to be fixed? |
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r? rust-lang/types