Grammar error and vim syntax highlighting mistake fixed.

Author: mattcarberry

doc/po/rust.md.pot

@@ -661,7 +661,7 @@ msgstr ""
 
 #. type: Plain text
 #: doc/rust.md:319
-msgid "An _integer literal_ has one of three forms:"
+msgid "An _integer literal_ has one of four forms:"
 msgstr ""
 
 #. type: Bullet: '  * '

src/etc/vim/syntax/rust.vim

@@ -160,7 +160,7 @@ syn match     rustNumber      display "\<[0-9][0-9_]*\(i\|i8\|i16\|i32\|i64\)\>"
 
 syn match     rustHexNumber   display "\<0x[a-fA-F0-9_]\+\>"
 syn match     rustHexNumber   display "\<0x[a-fA-F0-9_]\+\(u\|u8\|u16\|u32\|u64\)\>"
-syn match     rustHexNumber   display "\<0x[0-9_]\+\(i8\|i16\|i32\|i64\)\>"
+syn match     rustHexNumber   display "\<0x[a-fA-F0-9_]\+\(i8\|i16\|i32\|i64\)\>"
 syn match     rustOctNumber   display "\<0o[0-7_]\+\>"
 syn match     rustOctNumber   display "\<0o[0-7_]\+\(u\|u8\|u16\|u32\|u64\)\>"
 syn match     rustOctNumber   display "\<0o[0-7_]\+\(i8\|i16\|i32\|i64\)\>"