empty anonymous function not properly parsed

[FelipeLema]

Input

Channel(
    c->begin # some comment
    end)

Output

((source_file
  (call_expression
   (identifier)
   (argument_list
    (function_expression
     (identifier)
     (compound_expression
      (comment)
      (identifier)
      (MISSING "end"))))))
 . 156)

If I add anything to the body (say a single line with 1 in it), then it is properly parsed