Merge pull request #3081 from erickt/vim

Tweaks to the rust/vim conceal support

src/etc/vim/after/syntax/rust.vim

@@ -0,0 +1,30 @@
+if exists('g:no_rust_conceal') || !has('conceal') || &enc != 'utf-8'
+	finish
+endif
+
+" For those who don't want to see `::`...
+if exists('g:rust_conceal_mod_path')
+	syn match rustNiceOperator "::" conceal cchar=ㆍ
+endif
+
+syn match rustLeftArrowHead contained "-" conceal cchar= 
+syn match rustLeftArrowTail contained "<" conceal cchar=⟵
+syn match rustNiceOperator "<-" contains=rustLeftArrowHead,rustLeftArrowTail
+
+syn match rustRightArrowHead contained ">" conceal cchar= 
+syn match rustRightArrowTail contained "-" conceal cchar=⟶
+syn match rustNiceOperator "->" contains=rustRightArrowHead,rustRightArrowTail
+
+syn match rustLeftRightArrowHead contained ">" conceal cchar= 
+syn match rustLeftRightArrowTail contained "<-" conceal cchar=⟷
+syn match rustNiceOperator "<->" contains=rustLeftRightArrowHead,rustLeftRightArrowTail
+
+syn match rustFatRightArrowHead contained ">" conceal cchar= 
+syn match rustFatRightArrowTail contained "=" conceal cchar=⟹
+syn match rustNiceOperator "=>" contains=rustFatRightArrowHead,rustFatRightArrowTail
+
+syn match rustNiceOperator /\<\@!_\(_*\>\)\@=/ conceal cchar=′
+
+hi link rustNiceOperator Operator
+hi! link Conceal Operator
+setlocal conceallevel=2

src/etc/vim/syntax/rust.vim

@@ -103,19 +103,6 @@ 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=ㆍ
-
-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
-
-syn match rustIdentifierPrime /\<\@!_\(_*\>\)\@=/ conceal cchar=′
-
 hi def link rustHexNumber       rustNumber
 hi def link rustBinNumber       rustNumber
 hi def link rustIdentifierPrime rustIdentifier
@@ -136,7 +123,7 @@ 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 rustAssert ctermfg=yellow
 " hi rustMacro ctermfg=magenta