lean4-htt/tests/lean/run/inductionCheckAltNames.lean

49 lines
1.7 KiB
Text
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

universe u
axiom elimEx (motive : Nat → Nat → Sort u) (x y : Nat)
(diag : (a : Nat) → motive a a)
(upper : (delta a : Nat) → motive a (a + delta.succ))
(lower : (delta a : Nat) → motive (a + delta.succ) a)
: motive y x
/-- error: invalid alternative name 'lower2', expected 'diag', 'upper' or 'lower' -/
#guard_msgs in
theorem invalidAlt (p: Nat) : p ≤ q p > q := by
cases p, q using elimEx with
| lower2 /- error -/ d => apply Or.inl; admit
| upper d => apply Or.inr
| diag => apply Or.inl; apply Nat.le_refl
/-- error: invalid alternative name 'lower2', expected 'lower' -/
#guard_msgs in
theorem oneMissingAlt (p: Nat) : p ≤ q p > q := by
cases p, q using elimEx with
| upper d => apply Or.inl; admit
| diag => apply Or.inl; apply Nat.le_refl
| lower2 /- error -/ => apply Or.inr
/-- error: duplicate alternative name 'upper' -/
#guard_msgs in
theorem doubleAlt (p: Nat) : p ≤ q p > q := by
cases p, q using elimEx with
| upper d => apply Or.inl; admit
| upper d /- error -/ => apply Or.inr
| diag => apply Or.inl; apply Nat.le_refl
/-- error: invalid occurrence of wildcard alternative, it must be the last alternative -/
#guard_msgs in
theorem invalidWildCard (p: Nat) : p ≤ q p > q := by
cases p, q using elimEx with
| upper d => apply Or.inl; admit
| _ /- error -/ => apply Or.inr
| diag => apply Or.inl; apply Nat.le_refl
/-- error: invalid alternative name 'lower2', no unhandled alternatives -/
#guard_msgs in
theorem noAlt (p: Nat) : p ≤ q p > q := by
cases p, q using elimEx with
| upper d => apply Or.inl; admit
| lower => apply Or.inr
| diag => apply Or.inl; apply Nat.le_refl
| lower2 /- error -/ => apply Or.inr