Auto merge of rust-lang#88371 - Manishearth:rollup-pkkjsme, r=Manishearth

Rollup of 11 pull requests

Successful merges:

 - rust-lang#87832 (Fix debugger stepping behavior with `match` expressions)
 - rust-lang#88123 (Make spans for tuple patterns in E0023 more precise)
 - rust-lang#88215 (Reland rust-lang#83738: "rustdoc: Don't load all extern crates unconditionally")
 - rust-lang#88216 (Don't stabilize creation of TryReserveError instances)
 - rust-lang#88270 (Handle type ascription type ops in NLL HRTB diagnostics)
 - rust-lang#88289 (Fixes for LLVM change 0f45c16)
 - rust-lang#88320 (type_implements_trait consider obligation failure on overflow)
 - rust-lang#88332 (Add argument types tait tests)
 - rust-lang#88340 (Add `c_size_t` and `c_ssize_t` to `std::os::raw`.)
 - rust-lang#88346 (Revert "Add type of a let tait test impl trait straight in let")
 - rust-lang#88348 (Add field types tait tests)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

alloc/src/collections/mod.rs

@@ -117,12 +117,12 @@ impl From<TryReserveErrorKind> for TryReserveError {
     }
 }
 
-#[unstable(feature = "try_reserve", reason = "new API", issue = "48043")]
-impl From<LayoutError> for TryReserveError {
+#[unstable(feature = "try_reserve_kind", reason = "new API", issue = "48043")]
+impl From<LayoutError> for TryReserveErrorKind {
     /// Always evaluates to [`TryReserveErrorKind::CapacityOverflow`].
     #[inline]
     fn from(_: LayoutError) -> Self {
-        TryReserveErrorKind::CapacityOverflow.into()
+        TryReserveErrorKind::CapacityOverflow
     }
 }
 

std/src/os/raw/mod.rs

@@ -151,3 +151,17 @@ type_alias_no_nz! { "double.md", c_double = f64; }
 #[stable(feature = "raw_os", since = "1.1.0")]
 #[doc(no_inline)]
 pub use core::ffi::c_void;
+
+/// Equivalent to C's `size_t` type, from `stddef.h` (or `cstddef` for C++).
+///
+/// This type is currently always [`usize`], however in the future there may be
+/// platforms where this is not the case.
+#[unstable(feature = "c_size_t", issue = "88345")]
+pub type c_size_t = usize;
+
+/// Equivalent to C's `ssize_t` type, from `stddef.h` (or `cstddef` for C++).
+///
+/// This type is currently always [`isize`], however in the future there may be
+/// platforms where this is not the case.
+#[unstable(feature = "c_size_t", issue = "88345")]
+pub type c_ssize_t = isize;