Block parameters are possible to be in next line.

For example: [1,2,3].each do |x| end
vim-ruby · dkearns · Aug 27, 2016 · Aug 3, 2016 · Aug 3, 2016 · a9c4878ed10b73a2b96b53a0e5f15ad9484a3f30
commit a9c4878ed10b73a2b96b53a0e5f15ad9484a3f30
diff --git a/syntax/ruby.vim b/syntax/ruby.vim
@@ -138,7 +138,7 @@ endif
 syn match  rubyCapitalizedMethod	"\%(\%(^\|[^.]\)\.\s*\)\@<!\<\u\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)*\s*(\@="
 
 syn match  rubyBlockParameter	  "\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" contained
-syn region rubyBlockParameterList start="\%(\%(\<do\>\|{\)\s*\)\@<=|" end="|" oneline display contains=rubyBlockParameter
+syn region rubyBlockParameterList start="\%(\%(\<do\>\|{\)\_s*\)\@<=|" end="|" oneline display contains=rubyBlockParameter
 
 syn match rubyInvalidVariable	 "$[^ A-Za-z_-]"
 syn match rubyPredefinedVariable #$[!$&"'*+,./0:;<=>?@\`~]#