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Update BARE_TRAIT_OBJECT and ELLIPSIS_INCLUSIVE_RANGE_PATTERNS to errors in Rust 2021
This addresses https://github.com/rust-lang/rust/pull/81244 by updating two lints to errors in the Rust 2021 edition.
r? `@estebank`
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Be more conservative about discarding caller_bound in `ParamEnv::and`
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Tweak trait not `use`d suggestion
Fix #84272. Follow up to #83667.
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Add a suggestion when using a type alias instead of trait alias
Fixes #43913
r? `@estebank`
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Move some tests to more reasonable directories - 6
cc #73494
r? `@petrochenkov`
git mv bad/bad-const-type.* static/
git mv bad/bad-crate-name.* extern
git mv bad/bad-env-capture* fn/
git mv bad/bad-expr-lhs.* expr/
git mv bad/bad-expr-path* expr/
git mv bad/bad-extern-link-attrs.* extern/
git mv bad/bad-intrinsic-monomorphization.* intrinsics/
git mv bad/bad-lint-cap* lint/
git mv bad/bad-main.* fn
git mv bad/bad-method-typaram-kind.* type/
git mv bad/bad-mid-path-type-params.* fn
git mv bad/bad-module.* modules/
git mv bad/bad-sized.* type/
git mv bad/bad-type-env-capture.* fn
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Add a regression test for issue-51446
Closes #51446
r? `@estebank`
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Add more info for common trait resolution and async/await errors
* Suggest `Pin::new`/`Box::new`/`Arc::new`/`Box::pin` in more cases
* Point at `impl` and type defs introducing requirements on E0277
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Fix #83613.
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revert file
bless with nll mode
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Fixes issue #82920
Even if an item does not change between compilation sessions, it may end
up with a different `DefId`, since inserting/deleting an item affects
the `DefId`s of all subsequent items. Therefore, we use a `DefPathHash`
in the incremental compilation system, which is stable in the face of
changes to unrelated items.
In particular, the query system will consider the inputs to a query to
be unchanged if any `DefId`s in the inputs have their `DefPathHash`es
unchanged. Queries are pure functions, so the query result should be
unchanged if the query inputs are unchanged.
Unfortunately, it's possible to inadvertantly make a query result
incorrectly change across compilations, by relying on the specific value
of a `DefId`. Specifically, if the query result is a slice that gets
sorted by `DefId`, the precise order will depend on how the `DefId`s got
assigned in a particular compilation session. If some definitions end up
with different `DefId`s (but the same `DefPathHash`es) in a subsequent
compilation session, we will end up re-computing a *different* value for
the query, even though the query system expects the result to unchanged
due to the unchanged inputs.
It turns out that we have been sorting the predicates computed during
`astconv` by their `DefId`. These predicates make their way into the
`super_predicates_that_define_assoc_type`, which ends up getting used to
compute the vtables of trait objects. This, re-ordering these predicates
between compilation sessions can lead to undefined behavior at runtime -
the query system will re-use code built with a *differently ordered*
vtable, resulting in the wrong method being invoked at runtime.
This PR avoids sorting by `DefId` in `astconv`, fixing the
miscompilation. However, it's possible that other instances of this
issue exist - they could also be easily introduced in the future.
To fully fix this issue, we should
1. Turn on `-Z incremental-verify-ich` by default. This will cause the
compiler to ICE whenver an 'unchanged' query result changes between
compilation sessions, instead of causing a miscompilation.
2. Remove the `Ord` impls for `CrateNum` and `DefId`. This will make it
difficult to introduce ICEs in the first place.
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Partially address #81971.
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Add regression test for mutual recursion in obligation forest
Add regression test for #75860 with a slightly smaller example.
I was looking at what caused the issue and was surprised when it errors out on nightly, so I just added a regression test which should effectively close the issue, altho it would be nice to find the fix for reference.
Also I found that 80066 is not fixed by whatever fixed 75860.
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Address comments
Update limits
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This change breaks some code and doesn't appear to enable any new code.
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Goodbye, OIBIT!
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They were originally called "opt-in, built-in traits" (OIBITs), but
people realized that the name was too confusing and a mouthful, and so
they were renamed to just "auto traits". The feature flag's name wasn't
updated, though, so that's what this PR does.
There are some other spots in the compiler that still refer to OIBITs,
but I don't think changing those now is worth it since they are internal
and not particularly relevant to this PR.
Also see <https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/opt-in.2C.20built-in.20traits.20(auto.20traits).20feature.20name>.
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Improve wording of "cannot multiply" type error
For example, if you had this code:
fn foo(x: i32, y: f32) -> f32 {
x * y
}
You would get this error:
error[E0277]: cannot multiply `f32` to `i32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
However, that's not usually how people describe multiplication. People
usually describe multiplication like how the division error words it:
error[E0277]: cannot divide `i32` by `f32`
--> src/lib.rs:2:7
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2 | x / y
| ^ no implementation for `i32 / f32`
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= help: the trait `Div<f32>` is not implemented for `i32`
So that's what this change does. It changes this:
error[E0277]: cannot multiply `f32` to `i32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
To this:
error[E0277]: cannot multiply `i32` by `f32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
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Fix #77598.
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For example, if you had this code:
fn foo(x: i32, y: f32) -> f32 {
x * y
}
You would get this error:
error[E0277]: cannot multiply `f32` to `i32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
However, that's not usually how people describe multiplication. People
usually describe multiplication like how the division error words it:
error[E0277]: cannot divide `i32` by `f32`
--> src/lib.rs:2:7
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2 | x / y
| ^ no implementation for `i32 / f32`
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= help: the trait `Div<f32>` is not implemented for `i32`
So that's what this change does. It changes this:
error[E0277]: cannot multiply `f32` to `i32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
To this:
error[E0277]: cannot multiply `i32` by `f32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
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