`SourceFile::lines` is a big part of metadata. It's stored in a compressed form
(a difference list) to save disk space. Decoding it is a big fraction of
compile time for very small crates/programs.
This commit introduces a new type `SourceFileLines` which has a `Lines`
form and a `Diffs` form. The latter is used when the metadata is first
read, and it is only decoded into the `Lines` form when line data is
actually needed. This avoids the decoding cost for many files,
especially in `std`. It's a performance win of up to 15% for tiny
crates/programs where metadata decoding is a high part of compilation
costs.
A `Lock` is needed because the methods that access lines data (which can
trigger decoding) take `&self` rather than `&mut self`. To allow for this,
`SourceFile::lines` now takes a `FnMut` that operates on the lines slice rather
than returning the lines slice.
Fix `manual_range_contains` false negative with chains of `&&` and `||`
Fixes#8745
Since the precedence for `&&` is the same as itself the HIR for a chain of `&&` ends up with a right skewed tree like:
```
&&
/ \
&& c2
/ \
... c1
```
So only the leftmost `&&` was actually "fully" checked, the top level was just `c2` and `&&` so the `manual_range_contains` lint won't apply. This change makes it also check `c2` with `c1`.
There's a bit of a hacky solution in the [second commit](257f09776a) to check if the number of open/closing parens in the snippet match. This is to prevent a case like `((x % 2 == 0) || (x < 0)) || (x >= 10)` from offering a suggestion like `((x % 2 == 0) || !(0..10).contains(&x)` which now won't compile.
Any suggestions for that paren hack welcome, kinda new to working on this so not too sure about possible solutions :) it's weird because I don't know how else to check for parens in HIR considering they're removed when lowering AST.
changelog: Fix [`manual_range_contains`] false negative with chains of `&&` and `||`
Don't lint `useless_transmute` on types with erased regions
fixes#6356fixes#3340fixes#2906
This should get a proper fix at some point, but this at least gets the lint running on some types.
cc #5343
changelog: Don't lint `useless_transmute` on types with erased regions
`cast_abs_to_unsigned`: do not remove cast if it's required
Fixes#8873
If `iX` is not cast to `uX` then keep the cast rather than removing it
changelog: [`cast_abs_to_unsigned`]: do not remove cast if it's required
needless_late_init: fix ICE when all branches return the never type
Fixes#8911
When the assignment is done in a match guard or the if condition and all of the branches return the never type `assignment_suggestions` would return an empty `Vec` which caused the ICE. It now returns `None` in that scenario
Also moves some tests to the top of the file
changelog: ICE Fixes: [`needless_late_init`] #8911
Fix `[use_self]` false negative with on struct and tuple struct patterns
fixes#8845
changelog: Triggered the warning for ``[`use_self`]`` on `TupleStruct` and `Struct` patterns, whereas currently it's only triggered for `Path` patterns
add doc_link_with_quotes lint
I'm not sure about wording, it seems OK to me but happy to change if other people have better ideas
closes#8383
---
changelog: add [`doc_link_with_quotes`] lint
Check `.fixed` paths' existence in `run_ui`
This PR adds a test to check that there exists a `.fixed` file for every `.stderr` file in `tests/ui` that mentions a `MachineApplicable` lint. The test leverages `compiletest-rs`'s `rustfix_coverage` option.
I tried to add `.fixed` files where they appeared to be missing. However, 38 exceptional `.rs` files remain. Several of those include comments indicating that they are exceptions, though not all do. Apologies, as I have not tried to associate the 38 files with GH issues. (I think that would be a lot of work, and I worry about linking the wrong issue.)
changelog: none
Fix `empty_line_after_outer_attribute` false positive
This PR fixes a false positive in `empty_line_after_outer_attribute`.
Here is a minimal example that trigger the FP:
```rust
#[derive(clap::Parser)]
#[clap(after_help = "This ia a help message.
You're welcome.
")]
pub struct Args;
```
changelog: PF: [`empty_line_after_outer_attribute`]: No longer lints empty lines in inner string values.
Introduce `allow-dbg-in-tests` config value
related to: Issue #8758, PR https://github.com/rust-lang/rust-clippy/pull/8838
changelog: Introduced `allow-dbg-in-tests` config value. [dbg_macro] does not allow `dbg!` in test code by default.
When trying to set the current suggestion, if the type of the expression
is not a reference and it is not trivially pure clone copy, we should still
trigger and emit a lint message. Since this fix may require cloning an
expensive-to-clone type, do not attempt to offer a suggested fix.
This change means that matches generated from TryDesugar and AwaitDesugar
would normally trigger a lint, but they are out of scope for this lint,
so we will explicitly ignore matches with sources of TryDesugar or
AwaitDesugar.
changelog: Update for [`significant_drop_in_scrutinee`] to correctly
emit lint messages for cases where the type is not a reference and
not trivially pure clone copy.
Only return `DefId`s to `Fn`-like definitions in `clippy_utils::fn_def_id`
Fixes#8850
in `returns.rs` `tcx.fn_sig` is called on the result of `fn_def_id`, which panics if the def is a `const`/`static`/etc rather than a functions definition
bc4d39e5fe/clippy_lints/src/returns.rs (L294-L303)
changelog: Fix ICE due to callable `static`/`const`s
