add u128/i128 syntax (#257)

* add u128/i128 suffixes

* add u128 tests

* small fix

Author: TheIronBorn

RustEnhanced.sublime-syntax

@@ -9,7 +9,7 @@ variables:
   identifier: '(?:[[:alpha:]][_[:alnum:]]*|_[_[:alnum:]]+)'
   escaped_byte: '\\([nrt0\"''\\]|x\h{2})'
   escaped_char: '\\([nrt0\"''\\]|x\h{2}|u\{\h{1,6}\})'
-  int_suffixes: '[iu](?:8|16|32|64|size)'
+  int_suffixes: '[iu](?:8|16|32|64|128|size)'
   float_suffixes: 'f(32|64)'
 contexts:
   main:

syntax_test_rust.rs

@@ -142,6 +142,12 @@ let raw_bytes = br#"This won't escape anything either \x01 \""#;
 //^^^^^^^^^ constant.numeric.integer.octal
 //         ^^^ storage.type - constant.numeric.integer.octal
 
+0x12e15e35b500f16e2e714eb2b37916a5_u128;
+// <- constant.numeric.integer.hexadecimal
+ // <- constant.numeric.integer.hexadecimal
+//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constant.numeric.integer.hexadecimal
+//                                 ^^^^ storage.type - constant.numeric.integer.hexadecimal
+
 extern crate foo;
 // <- keyword.other
 //^^^^ keyword.other