elab_error_msgs.lean:2:0: error: type mismatch at application
  and.rec (λ (ha : ?m_1) (hb : delayed[?m_2]) (hb : delayed[?m_3]), ha)
term
  λ (ha : ?m_1) (hb : delayed[?m_2]) (hb : delayed[?m_3]), ha
has type
  Π (ha : ?m_1) (hb : delayed[?m_2]) (hb_1 : delayed[?m_3]), delayed[?m_1]
but is expected to have type
  ?m_1 → ?m_2 → ?m_4
Additional information:
elab_error_msgs.lean:2:0: context: 'eliminator' elaboration was not used for 'and.rec' because it is not fully applied, #2 explicit arguments expected
elab_error_msgs.lean:4:0: warning: declaration 'bogus_elim' uses sorry
elab_error_msgs.lean:9:0: error: type mismatch at application
  bogus_elim trivial
term
  trivial
has type
  true
but is expected to have type
  ?m_1 ?m_2 ?m_2
Additional information:
elab_error_msgs.lean:9:0: context: 'eliminator' elaboration is not used for 'bogus_elim' because a (reliable) way to synthesize 'a', which occurs in the resulting type, was not found