Rollup merge of #111543 - Urgau:uplift_invalid_utf8_in_unchecked, r=W…

…affleLapkin

Uplift `clippy::invalid_utf8_in_unchecked` lint

This PR aims at uplifting the `clippy::invalid_utf8_in_unchecked` lint into two lints.

## `invalid_from_utf8_unchecked`

(deny-by-default)

The `invalid_from_utf8_unchecked` lint checks for calls to `std::str::from_utf8_unchecked` and `std::str::from_utf8_unchecked_mut` with an invalid UTF-8 literal.

### Example

```rust
unsafe {
    std::str::from_utf8_unchecked(b"cl\x82ippy");
}
```

### Explanation

Creating such a `str` would result in undefined behavior as per documentation for `std::str::from_utf8_unchecked` and `std::str::from_utf8_unchecked_mut`.

## `invalid_from_utf8`

(warn-by-default)

The `invalid_from_utf8` lint checks for calls to `std::str::from_utf8` and `std::str::from_utf8_mut` with an invalid UTF-8 literal.

### Example

```rust
std::str::from_utf8(b"ru\x82st");
```

### Explanation

Trying to create such a `str` would always return an error as per documentation for `std::str::from_utf8` and `std::str::from_utf8_mut`.

-----

Mostly followed the instructions for uplifting a clippy lint described here: rust-lang/rust#99696 (review)

````@rustbot```` label: +I-lang-nominated
r? compiler

-----

For Clippy:

changelog: Moves: Uplifted `clippy::invalid_utf8_in_unchecked` into rustc

clippy_lints/src/declared_lints.rs

@@ -212,7 +212,6 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::instant_subtraction::UNCHECKED_DURATION_SUBTRACTION_INFO,
     crate::int_plus_one::INT_PLUS_ONE_INFO,
     crate::invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS_INFO,
-    crate::invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED_INFO,
     crate::items_after_statements::ITEMS_AFTER_STATEMENTS_INFO,
     crate::items_after_test_module::ITEMS_AFTER_TEST_MODULE_INFO,
     crate::iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR_INFO,

clippy_lints/src/lib.rs

@@ -157,7 +157,6 @@ mod inline_fn_without_body;
 mod instant_subtraction;
 mod int_plus_one;
 mod invalid_upcast_comparisons;
-mod invalid_utf8_in_unchecked;
 mod items_after_statements;
 mod items_after_test_module;
 mod iter_not_returning_iterator;
@@ -937,7 +936,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(move |_| Box::new(manual_retain::ManualRetain::new(msrv())));
     let verbose_bit_mask_threshold = conf.verbose_bit_mask_threshold;
     store.register_late_pass(move |_| Box::new(operators::Operators::new(verbose_bit_mask_threshold)));
-    store.register_late_pass(|_| Box::new(invalid_utf8_in_unchecked::InvalidUtf8InUnchecked));
     store.register_late_pass(|_| Box::<std_instead_of_core::StdReexports>::default());
     store.register_late_pass(move |_| Box::new(instant_subtraction::InstantSubtraction::new(msrv())));
     store.register_late_pass(|_| Box::new(partialeq_to_none::PartialeqToNone));

clippy_lints/src/renamed_lints.rs

@@ -43,6 +43,7 @@ pub static RENAMED_LINTS: &[(&str, &str)] = &[
     ("clippy::into_iter_on_array", "array_into_iter"),
     ("clippy::invalid_atomic_ordering", "invalid_atomic_ordering"),
     ("clippy::invalid_ref", "invalid_value"),
+    ("clippy::invalid_utf8_in_unchecked", "invalid_from_utf8_unchecked"),
     ("clippy::let_underscore_drop", "let_underscore_drop"),
     ("clippy::mem_discriminant_non_enum", "enum_intrinsics_non_enums"),
     ("clippy::panic_params", "non_fmt_panics"),

tests/ui/rename.fixed

@@ -38,6 +38,7 @@
 #![allow(array_into_iter)]
 #![allow(invalid_atomic_ordering)]
 #![allow(invalid_value)]
+#![allow(invalid_from_utf8_unchecked)]
 #![allow(let_underscore_drop)]
 #![allow(enum_intrinsics_non_enums)]
 #![allow(non_fmt_panics)]
@@ -87,6 +88,7 @@
 #![warn(array_into_iter)]
 #![warn(invalid_atomic_ordering)]
 #![warn(invalid_value)]
+#![warn(invalid_from_utf8_unchecked)]
 #![warn(let_underscore_drop)]
 #![warn(enum_intrinsics_non_enums)]
 #![warn(non_fmt_panics)]

tests/ui/rename.rs

@@ -38,6 +38,7 @@
 #![allow(array_into_iter)]
 #![allow(invalid_atomic_ordering)]
 #![allow(invalid_value)]
+#![allow(invalid_from_utf8_unchecked)]
 #![allow(let_underscore_drop)]
 #![allow(enum_intrinsics_non_enums)]
 #![allow(non_fmt_panics)]
@@ -87,6 +88,7 @@
 #![warn(clippy::into_iter_on_array)]
 #![warn(clippy::invalid_atomic_ordering)]
 #![warn(clippy::invalid_ref)]
+#![warn(clippy::invalid_utf8_in_unchecked)]
 #![warn(clippy::let_underscore_drop)]
 #![warn(clippy::mem_discriminant_non_enum)]
 #![warn(clippy::panic_params)]