auxDeclIssue.lean:5:3-5:13: error: tactic 'assumption' failed
⊢ False
auxDeclIssue.lean:11:2-11:9: error: tactic 'subst' failed, did not find equation for eliminating 'x'
x y : Nat
⊢ x = y
auxDeclIssue.lean:18:3-18:13: error: tactic 'assumption' failed
ex3 : False
⊢ False