Update

syntax/litcoffee.vim

@@ -0,0 +1,27 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'coffee-script') == -1
+  
+" Language:   Literate CoffeeScript
+" Maintainer: Michael Smith <michael@diglumi.com>
+" URL:        https://github.com/mintplant/vim-literate-coffeescript
+" License:    MIT
+
+if exists('b:current_syntax') && b:current_syntax == 'litcoffee'
+  finish
+endif
+
+syn include @markdown syntax/markdown.vim
+syn include @coffee syntax/coffee.vim
+
+" Partition the file into notCoffee and inlineCoffee. Each line will match
+" exactly one of these regions. notCoffee matches with a zero-width
+" look-behind.
+syn region notCoffee start='^\%(    \|\t\)\@<!' end='$' contains=@markdown
+syn region inlineCoffee start='^    \|\t' end='$' contains=@coffee
+
+" We defined notCoffee as a region so we can highlight every element in it
+" that doesn't have it's own explicit rule.
+highlight default link notCoffee Comment
+
+let b:current_syntax = "litcoffee"
+
+endif