tweaks previous commit

README.md

@@ -93,8 +93,8 @@ The conversions supported cover the following cases.
 ### Version 1.9.0 news (unreleased)
 
   * Fixed-point numbers can now be formatted as hexadecimal with [`Debug`]
-    similarly to primitive integers, for example with format strings `"{:x?}"`
-    and `"{:X?}"` for lower-case and upper-case hexadecimal.
+    similarly to primitive integers, for example formatting with `{:X?}` will
+    produce upper-case hexadecimal fixed-point numbers.
   * The following method was added to all fixed-point numbers, to the
     [`Fixed`][tf-1-9] trait, and to the [`Wrapping`][w-1-9] and
     [`Unwrapped`][u-1-9] wrappers:

RELEASES.md

@@ -9,8 +9,8 @@ Version 1.9.0 (unreleased)
 ==========================
 
   * Fixed-point numbers can now be formatted as hexadecimal with [`Debug`]
-    similarly to primitive integers, for example with format strings `"{:x?}"`
-    and `"{:X?}"` for lower-case and upper-case hexadecimal.
+    similarly to primitive integers, for example formatting with `{:X?}` will
+    produce upper-case hexadecimal fixed-point numbers.
   * The following method was added to all fixed-point numbers, to the
     [`Fixed`][tf-1-9] trait, and to the [`Wrapping`][w-1-9] and
     [`Unwrapped`][u-1-9] wrappers:

src/debug_hex.rs

@@ -13,6 +13,12 @@
 // <https://www.apache.org/licenses/LICENSE-2.0> and
 // <https://opensource.org/licenses/MIT>.
 
+use core::{
+    cell::Cell,
+    fmt::{Debug, Formatter, Result as FmtResult, Write},
+    sync::atomic::{AtomicU32, Ordering},
+};
+
 // This is an ugly hack to check whether a `Formatter` has `debug_lower_hex` or
 // `debug_upper_hex`.
 //
@@ -23,17 +29,11 @@
 // under test.
 //
 // If something fails, `u32::MAX` is stored in `DEBUG_LOWER_HEX` to avoid
-// repeating the hack dummy format.
+// repeating the dummy write.
 //
 // A similar process is used for `is_debug_upper_hex` with a format string
 // "{:X?}" used for the dummy write.
 
-use core::{
-    cell::Cell,
-    fmt::{Debug, Formatter, Result as FmtResult, Write},
-    sync::atomic::{AtomicU32, Ordering},
-};
-
 // Both `DEBUG_LOWER_HEX` and `DEBUG_UPPER_HEX` are:
 //   * 0 for not cached
 //   * `u32::MAX` for error