Better diagnosis for loose @ forms.

* eval.c (op_meta_error): New static function.
(eval_init): Register sys:var and sys:expr as operators
that throw error.

* parser.y (sym_helper): Take parser_t instead of scanner_t
argument so we have access to the name and line number.
Obtain scanner internally from parser. Add source location
info to (sys:var ...) form.
(symhlpr): Retarget macro to pass parser rather than scanner to
sm_helper.

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