lean4-htt/old_tests/tests/lean/pp_bug.lean

variables p q : Prop
#check ¬(p → q)
#check ¬p → q
#check (¬p) → q
#check ¬(p → q)
#check p ↔ q
#check ¬(p ↔ q)
#check ¬p ↔ q
#check (¬p) ↔ q
#check (p → q) ↔ q
#check p → (q ↔ q)