Merge pull request #183 from mikz/patch-1

Fix undefined quote in Item:build_return_groups

ldoc/doc.lua

@@ -913,6 +913,7 @@ end
 local struct_return_type = '*'
 
 function Item:build_return_groups()
+   local quote = tools.quote
    local modifiers = self.modifiers
    local retmod = modifiers['return']
    local groups = List()