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r=davidtwco,RalfJung"
This reverts commit b57d93d8b9525fa261404b4cd9c0670eeb1264b8, reversing
changes made to 0aeaa5eb22180fdf12a8489e63c4daa18da6f236.
(cherry picked from commit 122a55bb442bd1995df9cf9b36e6f65ed3ef4a1d)
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This reverts commit 7c301ecdf5e806b7aa3c44e4a185049fabbc4381, reversing
changes made to dffaad83327454430129802f240121f8c7866208.
(cherry picked from commit 0bb4880581a6963e0b895f9550e9147c68b9537a)
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This reverts commit e108481f74ff123ad98a63bd107a18d13035b275, reversing
changes made to 303e8bd768526a5812bb1776e798e829ddb7d3ca.
(cherry picked from commit ca1c17c88d1f625763859396ba7a50f36ac45cc0)
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potential violations
(cherry picked from commit 045271ccccd6c485f65ed94aeef3357a512e22fb)
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Everything's moved to `PtrMetadata` instead.
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Make sure we handle `backwards_incompatible_lint` drops appropriately in drop elaboration
In #131326, a new kind of scheduled drop (`drop_kind: DropKind::Value` + `backwards_incompatible_lint: true`) was added so that we could insert a new kind of no-op MIR statement (`backward incompatible drop`) for linting purposes.
These drops were intended to have *no side-effects*, but drop elaboration code forgot to handle these drops specially and they were handled otherwise as normal drops in most of the code. This ends up being **unsound** since we insert more than one drop call for some values, which means that `Drop::drop` could be called more than once.
This PR fixes this by splitting out the `DropKind::ForLint` and adjusting the code. I'm not totally certain if all of the places I've adjusted are either reachable or correct, but I'm pretty certain that it's *more* correct than it was previously.
cc `@dingxiangfei2009`
r? nikomatsakis
Fixes #134482
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Do not do if ! else, use unnegated cond and swap the branches instead
I'm tidying up my ergonomic ref counting PR and I'm going to make some small, simple and unrelated changes outside that PR, so the main PR sticks more straight to the point.
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`rustc_span::symbol` defines some things that are re-exported from
`rustc_span`, such as `Symbol` and `sym`. But it doesn't re-export some
closely related things such as `Ident` and `kw`. So you can do `use
rustc_span::{Symbol, sym}` but you have to do `use
rustc_span::symbol::{Ident, kw}`, which is inconsistent for no good
reason.
This commit re-exports `Ident`, `kw`, and `MacroRulesNormalizedIdent`,
and changes many `rustc_span::symbol::` qualifiers in `compiler/` to
`rustc_span::`. This is a 200+ net line of code reduction, mostly
because many files with two `use rustc_span` items can be reduced to
one.
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