antlr-skip-file-prelude is a compiled Lisp function in `antlr-mode.el'.

(antlr-skip-file-prelude SKIP-COMMENT)

Skip the file prelude: the header and file options.
If SKIP-COMMENT is non-nil, also skip the comment after that part.
Return the start position of the file prelude.

Hack: if SKIP-COMMENT is `header-only' only skip header and return
position before the comment after the header.