Change wording from "nullable" to "default".
Introduce a trait `IsDefault` for detecting values that are encoded as zeros or not encoded at all.
Add panics to impossible cases.
Some other minor cleanups.
Less import overhead for errors
This removes huge (3+ lines) import lists found in files that had their error reporting migrated. These lists are bad for developer workflows as adding, removing, or editing a single error's name might cause a chain reaction that bloats the git diff. As the error struct names are long, the likelihood of such chain reactions is high.
Follows the suggestion by `@Nilstrieb` in the [zulip thread](https://rust-lang.zulipchat.com/#narrow/stream/147480-t-compiler.2Fwg-diagnostics/topic/massive.20use.20statements) to replace the `use errors::{FooErr, BarErr};` with `use errors;` and then changing to `errors::FooErr` on the usage sites.
I have used sed to do most of the changes, i.e. something like:
```
sed -i -E 's/(create_err|create_feature_err|emit_err|create_note|emit_fatal|emit_warning)\(([[:alnum:]]+|[A-Z][[:alnum:]:]*)( \{|\))/\1(errors::\2\3/' path/to/file.rs
```
& then I manually fixed the errors that occured. Most manual changes were required in `compiler/rustc_parse/src/parser/expr.rs`.
r? `@compiler-errors`
emit `ConstEquate` in `TypeRelating<D>`
emitting `ConstEquate` during mir typeck is useful since it can help catch bugs in hir typeck incase our impl of `ConstEquate` is wrong.
doing this did actually catch a bug, when relating `Expr::Call` we `==` the types of all the argument consts which spuriously returns false if the type contains const projections/aliases which causes us to fall through to the `expected_found` error arm.
Generally its an ICE if the `Const`'s `Ty`s arent equal but `ConstKind::Expr` is kind of special since they are sort of like const items that are `const CALL<F: const Fn(...), const N: F>` though we dont actually explicitly represent the `F` type param explicitly in `Expr::Call` so I just made us relate the `Const`'s ty field to avoid getting ICEs from the tests I added and the following existing test:
```rust
// tests/ui/const-generics/generic_const_exprs/different-fn.rs
#![feature(generic_const_exprs)]
#![allow(incomplete_features)]
use std::mem::size_of;
use std::marker::PhantomData;
struct Foo<T>(PhantomData<T>);
fn test<T>() -> [u8; size_of::<T>()] {
[0; size_of::<Foo<T>>()]
//~^ ERROR unconstrained generic constant
//~| ERROR mismatched types
}
fn main() {
test::<u32>();
}
```
which has us relate two `ConstKind::Value` one for the fn item of `size_of::<Foo<T>>` and one for the fn item of `size_of::<T>()`, these only differ by their `Ty` and if we don't relate the `Ty` we'll end up getting an ICE from the checks that ensure the `ty` fields always match.
In theory `Expr::UnOp` has the same problem so I added a call to `relate` for the ty's, although I was unable to create a repro test.
consolidate bootstrap docs
With this diff, I tried to consolidate bootstrap documentations and remove the duplicated informations.
Coupled with https://github.com/rust-lang/rustc-dev-guide/pull/1563Resolves#90686
Signed-off-by: ozkanonur <work@onurozkan.dev>
Move code in `rustc_driver` out to a new `rustc_driver_impl` crate to allow pipelining
That adds a `rustc_shared` library which contains all the rustc library crates in a single dylib. It takes over this role from `rustc_driver`. This is done so that `rustc_driver` can be compiled in parallel with other crates. `rustc_shared` is intentionally left empty so it only does linking.
An alternative could be to move the code currently in `rustc_driver` into a new crate to avoid changing the name of the distributed library.
Previously we would show this:
```
warning: unnecessary braces around block return value
--> /tmp/bad.rs:1:8
|
1 | fn a(){{{
| ^ ^
|
= note: `#[warn(unused_braces)]` on by default
help: remove these braces
|
1 - fn a(){{{
1 + fn a(){{
|
```
which is now hidden in this case.
We would create a span spanning between the pair of redundant {}s but there is only EOF instead of the `}` so we would previously point at nothing.
This would cause the debug assertion ice to trigger.
I would have loved to just only point at the second delim and say "you can remove that" but I'm not sure how to do that without refactoring the entire diagnostic which seems tricky. :(
But given that this does not seem to regress any other tests we have, I think this edge-casey enough be acceptable.
Fixes https://github.com/rust-lang/rust/issues/107423
r? @compiler-errors
Add a linker argument back to boostrap.py
In https://github.com/rust-lang/rust/pull/101783 I accidentally removed a load-bearing linker argument. This PR adds it back in.
r? jyn514
Rollup of 8 pull requests
Successful merges:
- #106887 (Make const/fn return params more suggestable)
- #107519 (Add type alias for raw OS errors)
- #107551 ( Replace `ConstFnMutClosure` with const closures )
- #107595 (Retry opening proc-macro DLLs a few times on Windows.)
- #107615 (Replace nbsp in all rustdoc code blocks)
- #107621 (Intern external constraints in new solver)
- #107631 (loudly tell people when they change `Cargo.lock`)
- #107632 (Clarifying that .map() returns None if None.)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
loudly tell people when they change `Cargo.lock`
It keeps happening that people accidentally commit changes to `Cargo.lock` and then have to be told by a reviewer to undo this. I've also seen cases where PRs are merged that accidentally changed `Cargo.lock` during a rebase.. I figure that purposeful changes to `Cargo.lock` are likely rarer than these accidental ones?
Replace nbsp in all rustdoc code blocks
Based on #106125 by `@dtolnay` — this PR fixes the line wrapping bug.
Fixes#106098. This makes code copyable from rustdoc rendered documentation into a Rust source file.
Retry opening proc-macro DLLs a few times on Windows.
On Windows, the compiler [sometimes](https://users.rust-lang.org/t/error-loadlibraryexw-failed/77603) fails with the message `error: LoadLibraryExW failed` when trying to load a proc-macro crate. The error seems to occur intermittently, similar to https://github.com/rust-lang/rust/issues/86929, however, it seems to be almost impossible to reproduce outside of CI environments and thus very hard to debug. The fact that the error only occurs intermittently makes me think that this is a timing related issue.
This PR is an attempt to mitigate the issue by letting the compiler retry a few times when encountering this specific error (which resolved the issue described in https://github.com/rust-lang/rust/issues/86929).
Make const/fn return params more suggestable
Bumps const item type suggestions to MachineApplicable (fixes#106843), also replaces FnDef with FnPtr items in return type suggestions to make more things suggestable.
r? diagnostics
