Apply udd/idd documentation to usize/isize as well

Author: Krappa322

library/core/src/num/mod.rs

@@ -1561,30 +1561,40 @@ from_str_radix! { signed i8 i16 i32 i64 i128 }
 // Re-use the relevant implementation of from_str_radix for isize and usize to avoid outputting two
 // identical functions.
 macro_rules! from_str_radix_size_impl {
-    ($($t:ident $size:ty),*) => {$(
+    ($($signedness:ident $t:ident $size:ty),*) => {$(
     impl $size {
-        /// Converts a string slice in a given base to an integer.
-        ///
-        /// The string is expected to be an optional `+` sign
-        /// followed by digits.
-        /// Leading and trailing whitespace represent an error.
-        /// Digits are a subset of these characters, depending on `radix`:
-        ///
-        /// * `0-9`
-        /// * `a-z`
-        /// * `A-Z`
-        ///
-        /// # Panics
-        ///
-        /// This function panics if `radix` is not in the range from 2 to 36.
-        ///
-        /// # Examples
-        ///
-        /// Basic usage:
-        ///
-        /// ```
-        #[doc = concat!("assert_eq!(", stringify!($size), "::from_str_radix(\"A\", 16), Ok(10));")]
-        /// ```
+            /// Converts a string slice in a given base to an integer.
+            ///
+            /// The string is expected to be an optional
+            #[doc = sign_dependent_expr!{
+                $signedness ?
+                if signed {
+                    " `+` or `-` "
+                }
+                if unsigned {
+                    " `+` "
+                }
+            }]
+            /// sign followed by only digits. Leading and trailing non-digit characters (including
+            /// whitespace) represent an error. Underscores (which are accepted in rust literals)
+            /// also represent an error.
+            ///
+            /// Digits are a subset of these characters, depending on `radix`:
+            /// * `0-9`
+            /// * `a-z`
+            /// * `A-Z`
+            ///
+            /// # Panics
+            ///
+            /// This function panics if `radix` is not in the range from 2 to 36.
+            ///
+            /// # Examples
+            ///
+            /// Basic usage:
+            ///
+            /// ```
+            #[doc = concat!("assert_eq!(", stringify!($int_ty), "::from_str_radix(\"A\", 16), Ok(10));")]
+            /// ```
         #[stable(feature = "rust1", since = "1.0.0")]
         #[rustc_const_unstable(feature = "const_int_from_str", issue = "59133")]
         pub const fn from_str_radix(src: &str, radix: u32) -> Result<$size, ParseIntError> {
@@ -1597,8 +1607,8 @@ macro_rules! from_str_radix_size_impl {
 }
 
 #[cfg(target_pointer_width = "16")]
-from_str_radix_size_impl! { i16 isize, u16 usize }
+from_str_radix_size_impl! { signed i16 isize, unsigned u16 usize }
 #[cfg(target_pointer_width = "32")]
-from_str_radix_size_impl! { i32 isize, u32 usize }
+from_str_radix_size_impl! { signed i32 isize, unsigned u32 usize }
 #[cfg(target_pointer_width = "64")]
-from_str_radix_size_impl! { i64 isize, u64 usize }
+from_str_radix_size_impl! { signed i64 isize, unsigned u64 usize }