Break when there is a mismatch in the type count
When other errors are generated, there can be a mismatch between the
amount of input types in MIR, and the amount in the function itself.
Break from the comparative loop if this is the case to prevent
out-of-bounds.
Fixes#83499
normalize mir::Constant differently from ty::Const in preparation for valtrees
Valtrees are unable to represent many kind of constant values (this is on purpose). For constants that are used at runtime, we do not need a valtree representation and can thus use a different form of evaluation. In order to make this explicit and less fragile, I added a `fold_constant` method to `TypeFolder` and implemented it for normalization. Normalization can now, when it wants to eagerly evaluate a constant, normalize `mir::Constant` directly into a `mir::ConstantKind::Val` instead of relying on the `ty::Const` evaluation.
In the future we can get rid of the `ty::Const` in there entirely and add our own `Unevaluated` variant to `mir::ConstantKind`. This would allow us to remove the `promoted` field from `ty::ConstKind::Unevaluated`, as promoteds can never occur in the type system.
cc `@rust-lang/wg-const-eval`
r? `@lcnr`
This change reduces the risk of impacting coverage tests on unrelated
changes (such as MIR and Span changes), and reduces the burden when
blessing coverage changes in case it is necessary.
* Remove all spanview tests. The spanview tests were useful during
development, but they can be generated as needed, via compiler command
line flags. They aren't critical to confirming coverage results. (The
coverage report tests are sufficient.)
When spanview regeneration was necessary, the diffs were way too hard
to read to be useful anyway. So I'm removing them to reduce friction
from a feature that is no longer useful.
* Remove the requirement for `llvm-cov show --debug` when blessing
tests. The `--debug` flag is, unfortunately, only available if LLVM is
built with `optimize = false` (in Rust's config.toml). This adds
significant time and resource burdens to the contributor's build. As
it turns out, for other reasons in the past, I wasn't actually using
the debug output (counter info) to validate coverage anymore either,
so it was required for no reason, I now realize.
Rename `#[doc(spotlight)]` to `#[doc(notable_trait)]`
Fixes#80936.
"spotlight" is not a very specific or self-explaining name.
Additionally, the dialog that it triggers is called "Notable traits".
So, "notable trait" is a better name.
* Rename `#[doc(spotlight)]` to `#[doc(notable_trait)]`
* Rename `#![feature(doc_spotlight)]` to `#![feature(doc_notable_trait)]`
* Update documentation
* Improve documentation
r? `@Manishearth`
Beginning with FreeBSD 10.4 and 11.1, there is one guard page by
default. And the stack autoresizes, so if Rust allocates its own guard
page, then FreeBSD's will simply move up one page. The best solution is
to just use the OS's guard page.
Fix expected/found order on impl trait projection mismatch error
fixes#68561
This PR adds a new `ObligationCauseCode` used when checking the concrete type of an impl trait satisfies its bounds, and checks for that cause code in the existing test to see if a projection's normalized type should be the "expected" or "found" type.
The second commit adds a `peel_derives` to that test, which appears to be necessary in some cases (see projection-mismatch-in-impl-where-clause.rs, which would still give expected/found in the wrong order otherwise). This caused some other changes in diagnostics not involving impl trait, but they look correct to me.
Stream the dep-graph to a file instead of storing it in-memory.
This is a reimplementation of #60035.
Instead of storing the dep-graph in-memory, the nodes are encoded as they come
into the a temporary file as they come. At the end of a successful the compilation,
this file is renamed to be the persistent dep-graph, to be decoded during the next
compilation session.
This two-files scheme avoids overwriting the dep-graph on unsuccessful or crashing compilations.
The structure of the file is modified to be the sequence of `(DepNode, Fingerprint, EdgesVec)`.
The deserialization is responsible for going to the more compressed representation.
The `node_count` and `edge_count` are stored in the last 16 bytes of the file,
in order to accurately reserve capacity for the vectors.
At the end of the compilation, the encoder is flushed and dropped.
The graph is not usable after this point: any creation of a node will ICE.
I had to retrofit the debugging options, which is not really pretty.
panic early when `TrustedLen` indicates a `length > usize::MAX`
Changes `TrustedLen` specializations to immediately panic when `size_hint().1 == None`.
As far as I can tell this is ~not a change~ a minimal change in observable behavior for anything except ZSTs because the fallback path would go through `extend_desugared()` which tries to `reserve(lower_bound)` which already is `usize::MAX` and that would also lead to a panic. Before it might have popped somewhere between zero and a few elements from the iterator before panicking while it now panics immediately.
Overall this should reduce codegen by eliminating the fallback paths.
While looking into the `with_capacity()` behavior I also noticed that its documentation didn't have a *Panics* section, so I added that.
Update cargo
5 commits in 1e8703890f285befb5e32627ad4e0a0454dde1fb..3c44c3c4b7900b8b13c85ead25ccaa8abb7d8989
2021-03-26 16:59:39 +0000 to 2021-03-31 21:21:15 +0000
- Fix semver docs for 1.51. (rust-lang/cargo#9316)
- Add `cargo config` subcommand. (rust-lang/cargo#9302)
- Give one more example for the --featuers CLI (rust-lang/cargo#9313)
- Bump to 0.54.0, update changelog (rust-lang/cargo#9308)
- Make the URL to the tracking issue for `--out-dir` into a link (rust-lang/cargo#9309)
Rollup of 5 pull requests
Successful merges:
- #83015 (Add regression tests for #79825 and #81555)
- #83699 (Add a regression test for issue-68830)
- #83700 (Fix documentation of conversion from String to OsString)
- #83711 (Clarify `--print target-list` is a rustc's option)
- #83712 (Update LLVM with another wasm simd fix)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Refactor `Binder` to track bound vars
c.c. `@rust-lang/wg-traits`
This is super early (and might just get closed at some point), but want to get at least an initial idea of the perf impact.
r? `@ghost`
