replace_tac.lean:7:0: error: 1 unsolved subgoal
H : false
⊢ succ 0 + 1 = 2
replace_tac.lean:7:0: error: failed to add declaration 'example' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  ?M_1
replace_tac.lean:11:2: error:invalid 'replace' tactic, the new type
  succ 1
does not match the old type
  1
proof state:
H : false
⊢ 1 + 1 = 2
replace_tac.lean:12:0: error: don't know how to synthesize placeholder
H : false
⊢ 1 + 1 = 2
replace_tac.lean:12:0: error: failed to add declaration 'example' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  ?M_1
replace_tac.lean:18:2: error:replacing in hypotheses not implemented
proof state:
h : true
⊢ foo 2 = bar 2
replace_tac.lean:20:0: error: don't know how to synthesize placeholder
h : true
⊢ foo 2 = bar 2
replace_tac.lean:20:0: error: failed to add declaration 'example' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  ?M_1
replace_tac.lean:26:0: error: 1 unsolved subgoal

⊢ f 4 = p
replace_tac.lean:26:0: error: failed to add declaration 'example' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  ?M_1