1814.lean:4:8: error: invalid type ascription, term has type
  p
but is expected to have type
  p
types contain aliased name(s): p
remark: the tactic `dedup` can be used to rename aliases
state:
p p : Prop,
h1 : p,
h2 : p
⊢ p
1814.lean:11:8: error: invalid type ascription, term has type
  p_1
but is expected to have type
  p
state:
p p_1 : Prop,
h1 : p,
h2 : p_1
⊢ p