626b.hlean:4:48: error: don't know how to synthesize placeholder
x : S¹
⊢ bool
626b.hlean:4:50: error: don't know how to synthesize placeholder
x : S¹
⊢ eq.pathover (λ a, bool) ?M_1 loop ?M_1
626b.hlean:4:32: error: failed to add declaration 'f' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  λ x,
    circle.rec_on x ?M_1 ?M_2