vim: add Self type

Author: thestinger

src/etc/vim/syntax/rust.vim

@@ -30,7 +30,7 @@ syn match     rustFuncName    "\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%
 syn keyword   rustKeyword     m32 m64 m128 f80 f16 f128
 
 syn keyword   rustType        int uint float char bool u8 u16 u32 u64 f32
-syn keyword   rustType        f64 i8 i16 i32 i64 str
+syn keyword   rustType        f64 i8 i16 i32 i64 str Self
 syn keyword   rustType        Option Either
 
 " Types from libc