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/libstd/rt/backtrace.rs b/src/libstd/rt/backtrace.rs
index 107518ef27c..81022994387 100644
--- a/src/libstd/rt/backtrace.rs
+++ b/src/libstd/rt/backtrace.rs
@@ -71,7 +71,7 @@ fn demangle(writer: &mut Writer, s: &str) -> IoResult<()> {
         while valid {
             let mut i = 0;
             for c in chars {
-                if c.is_digit() {
+                if c.is_numeric() {
                     i = i * 10 + c as uint - '0' as uint;
                 } else {
                     break
@@ -101,7 +101,7 @@ fn demangle(writer: &mut Writer, s: &str) -> IoResult<()> {
                 first = false;
             }
             let mut rest = s;
-            while rest.char_at(0).is_digit() {
+            while rest.char_at(0).is_numeric() {
                 rest = rest.slice_from(1);
             }
             let i: uint = from_str(s.slice_to(s.len() - rest.len())).unwrap();