EXPR should prefer $/.ast to $<OPER>.ast when building node. Fix .panic message to occur on cursor object instead of Match.
EXPR should prefer $/.ast to $<OPER>.ast when building node.
Fix .panic message to occur on cursor object instead of Match.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,perl6/nqp-rx,perl6/nqp-rx,cygx/nqp,cygx/nqp