Rollup of 4 pull requests #123795
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Rollup of 4 pull requests #123795
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This change makes `build.bootstrap-cache-path` option to be configurable with `./configure` script, so it can be used like `./configure --bootstrap-cache-path=demo`. Signed-off-by: onur-ozkan <[email protected]>
…env, r=oli-obk
Make the computation of `coroutine_captures_by_ref_ty` more sophisticated
Currently, we treat all the by-(mut/)ref borrows of a coroutine-closure as having a "closure env" borrowed lifetime.
When we have the given code:
```rust
let x: &'a i32 = ...;
let c = async || {
let _x = *x;
};
```
Then when we call:
```rust
c()
// which, because `AsyncFn` takes a `&self`, we insert an autoref:
(&c /* &'env {coroutine-closure} */)()
```
We will return a future whose captures contain `&'env i32` instead of `&'a i32`, which is way more restrictive than necessary. We should be able to drop `c` while the future is alive since it's not actually borrowing any data *originating from within* the closure's captures, but since the capture has that `'env` lifetime, this is not possible.
This wouldn't be true, for example, if the closure captured `i32` instead of `&'a i32`, because the `'env` lifetime is actually *necessary* since the data (`i32`) is owned by the closure.
This PR identifies two criteria where we *need* to take the borrow with the closure env lifetime:
1. If the closure borrows data from inside the closure's captures. This is not true if the parent capture is by-ref, OR if the parent capture is by-move and the child capture begins with a deref projection. This is the example described above.
2. If we're dealing with mutable references, since we cannot reborrow `&'env mut &'a mut i32` into `&'a mut i32`, *only* `&'env mut i32`.
See the documentation on `should_reborrow_from_env_of_parent_coroutine_closure` for more info.
**important:** As disclaimer states on that function, luckily, if this heuristic is not correct, then the program is not unsound, since we still borrowck and validate the choices made from this function -- the only side-effect is that the user may receive unnecessary borrowck errors.
Fixes rust-lang#123241
…, r=compiler-errors Call lower_const_param instead of duplicating the code Follow up of rust-lang#123689 r? `@oli-obk` I had this commit in my old branch that I had forgotten about, `@fmease` pointed about this in rust-lang#123689 I've left the branches that are not `Range` as do nothing as that's what we are currently doing but maybe we want to err or something.
Fix typo MaybeUnit -> MaybeUninit
…r=clubby789 correct the handling of `bootstrap-cache-path` option This change makes `build.bootstrap-cache-path` option to be configurable with `./configure` script, so it can be used like `./configure --bootstrap-cache-path=demo`.
rustbot
added
S-waiting-on-review
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@bors r+ rollup=never p=4 |
bors
added
S-waiting-on-bors
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☀️ Test successful - checks-actions |
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📌 Perf builds for each rolled up PR:
previous master: 72fe8a0f00 In the case of a perf regression, run the following command for each PR you suspect might be the cause: |
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Finished benchmarking commit (df7daa8): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. 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.
CyclesResultsThis 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.
Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 675.554s -> 677.211s (0.25%) |
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Successful merges:
coroutine_captures_by_ref_tymore sophisticated #123660 (Make the computation ofcoroutine_captures_by_ref_tymore sophisticated)bootstrap-cache-pathoption #123790 (correct the handling ofbootstrap-cache-pathoption)r? @ghost
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