Add some support to better highlight Rust

It clears some Rust already existing syntax to better highlight the
important language items.

It then relinks some syntax to use the color scheme in a more efficient
way, and it adds some support for types and functions.

Those are the first for the Rust programming language.

after/syntax/rust.vim

@@ -0,0 +1,40 @@
+"                                       __     ____
+"                   _____ __  __ _____ / /_   / __/____   _____
+"                  / ___// / / // ___// __/  / /_ / __ \ / ___/
+"                 / /   / /_/ /(__  )/ /_   / __// /_/ // /
+"                /_/    \__,_//____/ \__/  /_/   \____//_/
+"                             __
+"                 ____   ____/ /__  __ _____ _____ ___   __  __
+"                / __ \ / __  // / / // ___// ___// _ \ / / / /
+"               / /_/ // /_/ // /_/ /(__  )(__  )/  __// /_/ /
+"               \____/ \__,_/ \__, //____//____/ \___/ \__, /
+"                            /____/                   /____/
+"
+" Note: This script aims at providing additional syntax for Rust. It only
+" declares them or clears them. To be more precise, it clears some syntax
+" because Odyssey is only a 12-colors scheme which implies that only some
+" particular language items must be highlighted. Plus it provides more support
+" for types and functions.
+"
+" Maintainer: Ludovic Koenig <ludovic.koenig@gmail.com>
+" Version: 0.5.0
+" Since: 0.5.0
+" Licence: MIT
+"
+" Rust Syntax {{{
+
+syntax clear rustModPath
+syntax clear rustModPathSep
+syntax clear rustTrait
+syntax clear rustIdentifier
+syntax clear rustFuncName
+syntax clear rustFuncCall
+syntax clear rustEnum
+syntax clear rustEnumVariant
+syntax clear rustOperator
+
+syntax match rustOdysseyFunction "\<\l\w*\>\%(\%(<\%(\w\|,\|'\|\s\)*>\)\=(\)\@="
+syntax match rustOdysseyType     "\<\u\w*\>"
+
+" }}}
+" vim: foldmethod=marker

colors/odyssey.vim

@@ -302,5 +302,11 @@ call s:h(      'rubyInstanceVariable', 'background',  'warning', 'italic')
 call s:l('rubyInterpolationDelimiter',   'Function')
 call s:l(       'rubyStringDelimiter',   'Constant')
 
+" }}}
+" Rust Highlights {{{
+call s:l(       'rustLifetime', 'Constant')
+call s:l(   'rustQuestionMark', 'Operator')
+call s:l('rustOdysseyFunction', 'Function')
+call s:l(    'rustOdysseyType', 'Type')
 " }}}
 " vim: foldmethod=marker