pub fn parsecmd(cmd: &str, eptr: Option<&mut usize>) -> Option<eprog>Expand description
Lex a <(...)/>(...)/=(...) body — the leading 2 chars are
the marker pair (Inang+Inpar, Outang+Inpar, Equals+Inpar),
remainder is the command up to the matching Outpar. Returns the
parsed Eprog (and writes the post-) cursor through eptr).