Auto merge of #67104 - Centril:rollup-07vahh9, r=Centril

Rollup of 10 pull requests

Successful merges:

 - #66606 (Add feature gate for mut refs in const fn)
 - #66841 (Add `{f32,f64}::approx_unchecked_to<Int>` unsafe methods)
 - #67009 (Emit coercion suggestions in more places)
 - #67052 (Ditch `parse_in_attr`)
 - #67071 (Do not ICE on closure typeck)
 - #67078 (accept union inside enum if not followed by identifier)
 - #67090 (Change "either" to "any" in Layout::from_size_align's docs)
 - #67092 (Fix comment typos in src/libcore/alloc.rs)
 - #67094 (get rid of __ in field names)
 - #67102 (Add note to src/ci/docker/README.md about multiple docker images)

Failed merges:

 - #67101 (use `#[allow(unused_attributes)]` to paper over incr.comp problem)

r? @ghost

Author: bors

src/ci/docker/README.md

@@ -16,6 +16,13 @@ for example:
 
 Images will output artifacts in an `obj` dir at the root of a repository.
 
+**NOTE**: Re-using the same `obj` dir with different docker images with
+the same target triple (e.g. `dist-x86_64-linux` and `dist-various-1`)
+may result in strange linker errors, due shared library versions differing between platforms.
+
+If you encounter any issues when using multiple Docker images, try deleting your `obj` directory
+before running your command.
+
 ## Filesystem layout
 
 - Each directory, excluding `scripts` and `disabled`, corresponds to a docker image

src/libcore/alloc.rs

@@ -53,7 +53,7 @@ pub struct Layout {
 
 impl Layout {
     /// Constructs a `Layout` from a given `size` and `align`,
-    /// or returns `LayoutErr` if either of the following conditions
+    /// or returns `LayoutErr` if any of the following conditions
     /// are not met:
     ///
     /// * `align` must not be zero,
@@ -137,7 +137,7 @@ impl Layout {
     #[inline]
     pub fn for_value<T: ?Sized>(t: &T) -> Self {
         let (size, align) = (mem::size_of_val(t), mem::align_of_val(t));
-        // See rationale in `new` for why this us using an unsafe variant below
+        // See rationale in `new` for why this is using an unsafe variant below
         debug_assert!(Layout::from_size_align(size, align).is_ok());
         unsafe {
             Layout::from_size_align_unchecked(size, align)
@@ -196,7 +196,7 @@ impl Layout {
         //    valid.
         //
         // 2. `len + align - 1` can overflow by at most `align - 1`,
-        //    so the &-mask wth `!(align - 1)` will ensure that in the
+        //    so the &-mask with `!(align - 1)` will ensure that in the
         //    case of overflow, `len_rounded_up` will itself be 0.
         //    Thus the returned padding, when added to `len`, yields 0,
         //    which trivially satisfies the alignment `align`.

src/libcore/convert.rs renamed to src/libcore/convert/mod.rs

@@ -40,6 +40,11 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
+mod num;
+
+#[unstable(feature = "convert_float_to_int", issue = "67057")]
+pub use num::FloatToInt;
+
 /// The identity function.
 ///
 /// Two things are important to note about this function: