left: E(k) -> E(k) op(k) E(k+1) | E(k+1) right: E(k) -> E(k+1) E_(k) E_(k) -> op(k) E(k+1) E_(k) | ⍷ 最高优先级: E(t) -> F E_(k) | U E_(k) E_(t) -> op(t) E(t) E_(t) | ⍷
(stream *PeekTokenStream, k int)
source not stored for this graph (policy: none)
no test coverage detected