Type Ctrl-D or 'Exit.' to exit or 'Help.' for help.
#   Set: pp::colors
  Set: pp::unicode
Proof state:
a : Bool, b : Bool ⊢ a ⇒ b ⇒ a ∧ b
## Error (line: 5, pos: 0) invalid 'done' command, proof cannot be produced from this state
Proof state:
a : Bool, b : Bool ⊢ a ⇒ b ⇒ a ∧ b
## Error (line: 6, pos: 0) invalid 'done' command, proof cannot be produced from this state
Proof state:
a : Bool, b : Bool ⊢ a ⇒ b ⇒ a ∧ b
## Proof state:
H : a, a : Bool, b : Bool ⊢ b ⇒ a ∧ b
## Error (line: 8, pos: 6) unknown tactic 'imp_tac2'
## Error (line: 9, pos: 0) invalid tactic command 'foo'
Proof state:
H : a, a : Bool, b : Bool ⊢ b ⇒ a ∧ b
## Proof state:
H::1 : b, H : a, a : Bool, b : Bool ⊢ a ∧ b
## Error (line: 11, pos: 0) tactic failed
Proof state:
H::1 : b, H : a, a : Bool, b : Bool ⊢ a ∧ b
## Proof state:
H::1 : b, H : a, a : Bool, b : Bool ⊢ a
H::1 : b, H : a, a : Bool, b : Bool ⊢ b
## Error (line: 13, pos: 0) failed to backtrack
Proof state:
H::1 : b, H : a, a : Bool, b : Bool ⊢ a
H::1 : b, H : a, a : Bool, b : Bool ⊢ b
## Proof state:
no goals
##   Proved: T2
#