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Description
It would be useful if possible, when a heredoc_end isn't found, that the rest of the file isn't captured by the heredoc_content, and instead terminates early on the following line (where the heredoc_body starts)
So that example would be something like:
(source_file
(call
receiver: (identifier)
method: (identifier)
arguments: (argument_list
(heredoc_start)
(identifier))
(heredoc_body
(heredoc_content) # this would be empty or not part of the tree
(MISSING 'HEREDOC_END')) # this would be on the line following the heredoc_start
(call
method: (identifier)
arguments: (argument_list
(string)))