Auto merge of rust-lang#121003 - matthiaskrgr:rollup-u5wyztn, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - rust-lang#120696 (Properly handle `async` block and `async fn` in `if` exprs without `else`)
 - rust-lang#120751 (Provide more suggestions on invalid equality where bounds)
 - rust-lang#120802 (Bail out of drop elaboration when encountering error types)
 - rust-lang#120967 (docs: mention round-to-even in precision formatting)
 - rust-lang#120973 (allow static_mut_ref in some tests that specifically test mutable statics)
 - rust-lang#120974 (llvm-wrapper: adapt for LLVM API change: Add support for EXPORTAS name types)
 - rust-lang#120986 (iterator.rs: remove "Basic usage" text)
 - rust-lang#120987 (remove redundant logic)
 - rust-lang#120988 (fix comment)
 - rust-lang#120995 (PassWrapper: adapt for llvm/llvm-project@93cdd1b5cfa3735c)

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

Author: bors

alloc/src/fmt.rs

@@ -278,6 +278,22 @@
 //! Hello, `     123` has 3 right-aligned characters
 //! ```
 //!
+//! When truncating these values, Rust uses [round half-to-even](https://en.wikipedia.org/wiki/Rounding#Rounding_half_to_even),
+//! which is the default rounding mode in IEEE 754.
+//! For example,
+//!
+//! ```
+//! print!("{0:.1$e}", 12345, 3);
+//! print!("{0:.1$e}", 12355, 3);
+//! ```
+//!
+//! Would return:
+//!
+//! ```text
+//! 1.234e4
+//! 1.236e4
+//! ```
+//!
 //! ## Localization
 //!
 //! In some programming languages, the behavior of string formatting functions

core/src/iter/traits/iterator.rs

@@ -89,8 +89,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -249,8 +247,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// assert_eq!(a.iter().count(), 3);
@@ -280,8 +276,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// assert_eq!(a.iter().last(), Some(&3));
@@ -324,8 +318,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_advance_by)]
     ///
@@ -432,8 +424,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [0, 1, 2, 3, 4, 5];
     /// let mut iter = a.iter().step_by(2);
@@ -1342,8 +1332,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -1434,8 +1422,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3, 4];
     ///
@@ -1486,8 +1472,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let words = ["alpha", "beta", "gamma"];
     ///
@@ -1765,8 +1749,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// // an iterator which alternates between Some and None
     /// struct Alternate {
@@ -1911,8 +1893,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let mut words = ["hello", "world", "of", "Rust"].into_iter();
     ///
@@ -2221,8 +2201,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -3193,8 +3171,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// let b: Vec<u32> = Vec::new();
@@ -3232,8 +3208,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// let b: Vec<u32> = Vec::new();
@@ -3420,8 +3394,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [(1, 2), (3, 4), (5, 6)];
     ///
@@ -3458,8 +3430,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -3538,8 +3508,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -3624,8 +3592,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// let sum: i32 = a.iter().sum();
@@ -3703,8 +3669,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_order_by)]
     ///
@@ -3790,8 +3754,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_order_by)]
     ///
@@ -3863,8 +3825,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_order_by)]
     ///