Remove unused rubyHeredoc syntax group

dkearns · dkearns · commit 1512c3f63652 · 2019-02-10T16:19:04.000+11:00
It appears to have been accidentally introduced in commit 187e1a4.
diff --git a/syntax/ruby.vim b/syntax/ruby.vim
@@ -249,10 +249,10 @@ syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|:
 syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<[-~]\=\zs'\%([^']*\)'+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
 syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<[-~]\=\zs`\%([^`]*\)`+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
 
-SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2 matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial keepend
-SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2					  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial keepend
-SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2					  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc		      keepend
-SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2					  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2 matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2					  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2					  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart			  keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2					  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
 
 SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3 matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
 SynFold '<<' syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3					    matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
@@ -455,7 +455,6 @@ hi def link rubySharpBang		PreProc
 hi def link rubyRegexpDelimiter		rubyStringDelimiter
 hi def link rubySymbolDelimiter		rubySymbol
 hi def link rubyStringDelimiter		Delimiter
-hi def link rubyHeredoc			rubyString
 hi def link rubyString			String
 hi def link rubyRegexpEscape		rubyRegexpSpecial
 hi def link rubyRegexpQuantifier	rubyRegexpSpecial
