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bors 63ef74b6aa Auto merge of #111717 - Urgau:uplift_fn_null_check, r=oli-obk 
Uplift `clippy::fn_null_check` lint

This PR aims at uplifting the `clippy::fn_null_check` lint into rustc.

## `incorrect_fn_null_checks`

(warn-by-default)

The `incorrect_fn_null_checks` lint checks for expression that checks if a function pointer is null.

### Example

```rust
let fn_ptr: fn() = /* somehow obtained nullable function pointer */

if (fn_ptr as *const ()).is_null() { /* ... */ }
```

### Explanation

Function pointers are assumed to be non-null, checking for their nullity is incorrect.

-----

Mostly followed the instructions for uplifting a clippy lint described here: https://github.com/rust-lang/rust/pull/99696#pullrequestreview-1134072751

`@rustbot` label: +I-lang-nominated
r? compiler
2023-07-11 09:34:48 +00:00
..
build-manifest Promote loongarch64-unknown-linux-gnu to Tier 2 with host tools 2023-05-23 18:33:57 +08:00
build_helper Port PGO/LTO/BOLT optimized build pipeline to Rust 2023-07-09 08:39:50 +02:00
bump-stage0 Upgrade to indexmap 2.0.0 2023-07-03 13:51:54 -07:00
cargo@45782b6b8a Update cargo 2023-07-07 23:17:40 +01:00
cargotest
clippy Auto merge of #111717 - Urgau:uplift_fn_null_check, r=oli-obk 2023-07-11 09:34:48 +00:00
collect-license-metadata Fix remaining typos 2023-04-10 21:02:49 +02:00
compiletest Auto merge of #113306 - tgross35:debuginfo-better-output, r=Mark-Simulacrum 2023-07-09 10:38:10 +00:00
error_index_generator Provide more context for rustc +nightly -Zunstable-options on stable 2023-06-27 23:23:33 +08:00
expand-yaml-anchors Run expand-yaml-anchors in x test tidy 2023-02-05 14:46:52 -06:00
generate-copyright Fix remaining typos 2023-04-10 21:02:49 +02:00
generate-windows-sys Move arm32 shim to c.rs 2023-06-24 17:30:27 +01:00
html-checker
jsondocck Fix remaining typos 2023-04-10 21:02:49 +02:00
jsondoclint IAT: Rustdoc integration 2023-05-04 16:59:11 +02:00
linkchecker Appease lints 2023-05-14 22:00:23 +02:00
lint-docs Fix x test lint-docs when download-rustc is enabled 2023-04-18 23:08:48 -05:00
lld-wrapper
miri Auto merge of #113488 - RalfJung:miri, r=RalfJung 2023-07-09 13:37:41 +00:00
miropt-test-tools add way to split mir-opt into panic=abort and panic=unwind 2023-06-12 09:34:14 +02:00
opt-dist Port PGO/LTO/BOLT optimized build pipeline to Rust 2023-07-09 08:39:50 +02:00
remote-test-client
remote-test-server
replace-version-placeholder Only depend on CFG_VERSION in rustc_interface 2023-05-17 23:54:21 -05:00
rls Don't use serde-derive in the rls shim 2023-07-10 14:53:57 -07:00
rust-analyzer Remove outdated import in r-a proc macro server. 2023-06-21 14:02:59 +02:00
rust-demangler
rust-installer fix typo 2023-07-04 19:19:50 +03:00
rustbook bump few deps 2023-04-06 18:21:37 +03:00
rustdoc
rustdoc-gui Transform backslash into slashes in DOC_FOLDER variable for browser-ui-test 2023-06-14 10:37:56 +02:00
rustdoc-gui-test Make try_run return a Result<(), ()> instead of a boolean 2023-06-23 17:07:34 +02:00
rustdoc-js Change format of rustdoc-js tests by putting query and correction directly alongside the expected values 2023-06-09 17:00:47 +02:00
rustdoc-themes
rustfmt Merge commit 'dca1cf90ad' into sync-rustfmt 2023-07-01 02:49:12 -05:00
suggest-tests Fix the test directories suggested by ./x.py suggest 2023-04-30 11:05:13 +10:00
tidy Remove the library/term exception in tidy's pal checker code 2023-07-10 08:25:50 +00:00
tier-check
unicode-table-generator remove some unneeded imports 2023-04-12 19:27:18 +02:00
unstable-book-gen
x Add other workspaces to linkedProjects in rust_analyzer_settings.json 2023-05-26 12:08:58 -05:00
cherry-pick.sh
publish_toolstate.py Apply changes to fix python linting errors 2023-06-16 20:56:01 -04:00