unicode: Rename UnicodeChar::is_digit to is_numeric

'Numeric' is the proper name of the unicode character class,
and this frees up the word 'digit' for ascii use in libcore.

Since I'm going to rename `Char::is_digit_radix` to
`is_digit`, I am not leaving a deprecated method in place,
because that would just cause name clashes, as both
`Char` and `UnicodeChar` are in the prelude.

[breaking-change]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libunicode/u_char.rs b/src/libunicode/u_char.rs
index bac8b21ea68..4bedc6f21f4 100644
--- a/src/libunicode/u_char.rs
+++ b/src/libunicode/u_char.rs
@@ -217,7 +217,7 @@ pub trait UnicodeChar {
     fn is_control(&self) -> bool;
 
     /// Indicates whether the character is numeric (Nd, Nl, or No).
-    fn is_digit(&self) -> bool;
+    fn is_numeric(&self) -> bool;
 
     /// Converts a character to its lowercase equivalent.
     ///
@@ -281,7 +281,7 @@ impl UnicodeChar for char {
 
     fn is_control(&self) -> bool { is_control(*self) }
 
-    fn is_digit(&self) -> bool { is_digit(*self) }
+    fn is_numeric(&self) -> bool { is_digit(*self) }
 
     fn to_lowercase(&self) -> char { to_lowercase(*self) }