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It's no longer necessary now that `-Wunreachable_pub` is being passed.
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Revert <https://github.com/rust-lang/rust/pull/138084> to buy time to
consider options that avoids breaking downstream usages of cargo on
distributed `rustc-src` artifacts, where such cargo invocations fail due
to inability to inherit `lints` from workspace root manifest's
`workspace.lints` (this is only valid for the source rust-lang/rust
workspace, but not really the distributed `rustc-src` artifacts).
This breakage was reported in
<https://github.com/rust-lang/rust/issues/138304>.
This reverts commit 48caf81484b50dca5a5cebb614899a3df81ca898, reversing
changes made to c6662879b27f5161e95f39395e3c9513a7b97028.
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Use workspace lints for crates in `compiler/`
This is nicer and hopefully less error prone than specifying lints via bootstrap.
r? ``@jieyouxu``
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(Except for `rustc_codegen_cranelift`.)
It's no longer necessary now that `unreachable_pub` is in the workspace
lints.
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Use `default_field_values` for `rustc_errors::Context`, `rustc_session::config::NextSolverConfig` and `rustc_session::config::ErrorOutputType`
Wanted to see where `#![feature(default_field_values)]` could be used in the codebase. These three seemed like no-brainers. There are a bunch of more places where we could remove manual `Default` impls, but they `derive` other traits that rely on `syn`, which [doesn't yet support `default_field_values`](https://github.com/dtolnay/syn/issues/1774).
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Remove `MaybeForgetReturn` suggestion
#115196 implemented a suggestion to add a missing `return` when there is an ambiguity error, when that ambiguity error could be constrained by the return type of the function.
I initially reviewed it and thought it could be useful; however, looking back at that code now, I feel like it's a bit too much of a hack to be worth keeping around in typeck, especially given how rare it's expected to fire in practice. This is especially true because it depends on `StashKey::MaybeForgetReturn`, which is only stashed when we have *Sized* obligation ambiguity errors. Let's remove it for now.
I'd like to note that it's basically impossible to get this suggestion to apply in its current state except for what I'd consider somewhat artificial examples, involving no generic trait bounds. For example, it's not triggered for:
```rust
struct W<T>(T);
fn bar<T: Default>() -> W<T> { todo!() }
fn foo() -> W<i32> {
if true {
bar();
}
W(0)
}
```
Nor is it triggered for:
```
fn foo() -> i32 {
if true {
Default::default();
}
0
}
```
It's basically only triggered iff there's only one ambiguity error on the type, which is `Sized`.
Generally, suggesting something that affects control flow is a pretty dramatic suggestion; therefore, both the accuracy and precision of this diagnostic should be pretty high.
One other, somewhat unrelated observation is that this might be using stashed diagnostics incorrectly (or at least unnecessarily). Stashed diagnostics are used when error detection is fragmented over several major stages of the compiler, like a parse or resolver error which later can be recovered in typeck. However, this one is a bit different since it is fully handled within typeck -- perhaps that suggests that if this were to be reimplemented, it wouldn't need to be so complicated of an implementation.
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with rust-analyzer
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Couple of cleanups to DiagCtxt and EarlyDiagCtxt
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Replacing the error emitter doesn't accidentally clear the error count.
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Provide a new function `listify`, meant to be used in cases similar to `pluralize!`. When you have a slice of arbitrary elements that need to be presented to the user, `listify` allows you to turn that into a list of comma separated strings.
This reduces a lot of redundant logic that happens often in diagnostics.
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Remove `PErr`.
It's just a synonym for `Diag` that adds no value and is only used in a few places.
r? ``@spastorino``
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suppress field expr with generics error message if it's a method
Don't emit "field expressions may not have generic arguments" if it's a method call without `()`
r? estebank
Fixes #67680
Is this the best way to go? It's by far the simplest I could come up with.
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It's just a synonym for `Diag` that adds no value and is only used in a
few places.
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method call without ()
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delayed bugs
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And pass this to the individual emitters when necessary.
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Avoid `&Lrc<T>` in various places
Seeing `&Lrc<T>` is a bit suspicious, and `&T` or `Lrc<T>` is often better.
r? `@oli-obk`
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It's simpler and more concise.
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It's no longer used meaningfully.
This also means `DiagCtxtHandle::err_count_excluding_lint_errs` can be
removed.
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r=compiler-errors,jieyouxu
chore: Fix typos in 'compiler' (batch 1)
Batch 1/3: Fixes typos in `compiler`
(See [issue](https://github.com/rust-lang/rust/issues/129874) tracking all PRs with typos fixes)
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Use `assert_matches` around the compiler more
It's a useful assertion, especially since it actually prints out the LHS.
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