vim: Add some optional beautification of ::, ->, and =>

Author: pcwalton

src/etc/vim/syntax/rust.vim

@@ -103,6 +103,17 @@ syn region    rustComment     start="//" skip="\\$" end="$" contains=rustTodo ke
 
 syn keyword   rustTodo        TODO FIXME XXX NB
 
+" For those who don't want to see `::`...
+syn match   rustModPathSep  "::" conceal cchar=・
+
+syn match rustArrowHead contained ">" conceal cchar= 
+syn match rustArrowTail contained "-" conceal cchar=⟶
+syn match rustArrowFull "->" contains=rustArrowHead,rustArrowTail
+
+syn match rustFatArrowHead contained ">" conceal cchar= 
+syn match rustFatArrowTail contained "=" conceal cchar=⟹
+syn match rustFatArrowFull "=>" contains=rustFatArrowHead,rustFatArrowTail
+
 hi def link rustHexNumber     rustNumber
 hi def link rustBinNumber     rustNumber
 
@@ -122,8 +133,8 @@ hi def link rustMacro         Macro
 hi def link rustType          Type
 hi def link rustTodo          Todo
 hi def link rustAttribute     PreProc
+hi def link rustModPathSep    Conceal
 " Other Suggestions:
-" hi def link rustModPathSep    Conceal
 " hi rustAssert ctermfg=yellow
 " hi rustMacro ctermfg=magenta