62f14514da
This PR updates various error messages produced by or associated with built-in tactics and adapts their formatting to current conventions.
96 lines
2.1 KiB
Text
96 lines
2.1 KiB
Text
/-!
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# `decide +kernel` tests
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-/
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/-!
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Very basic tests
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-/
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theorem foo1 : True := by decide
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theorem foo2 : True := by decide +kernel
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/-!
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Tests of the error message when goal is false.
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-/
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/--
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error: Tactic `decide` proved that the proposition
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False
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is false
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-/
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#guard_msgs in
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theorem foo3 : False := by decide
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/--
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error: Tactic `decide` proved that the proposition
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False
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is false
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-/
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#guard_msgs in
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theorem foo4 : False := by decide +kernel
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/-!
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The kernel sees through irreducible definitions
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-/
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@[irreducible] def irred {α : Type} (x : α) : α := x
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/--
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error: Tactic `decide` failed for proposition
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irred 3 = 3
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because its `Decidable` instance
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instDecidableEqNat (irred 3) 3
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did not reduce to `isTrue` or `isFalse`.
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After unfolding the instances `instDecidableEqNat` and `Nat.decEq`, reduction got stuck at the `Decidable` instance
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match h : (irred 3).beq 3 with
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| true => isTrue ⋯
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| false => isFalse ⋯
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-/
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#guard_msgs in theorem gcd_eq1 : irred 3 = 3 := by decide
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theorem gcd_eq2 : irred 3 = 3 := by decide +kernel
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/-!
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The proofs from `decide +kernel` are cached.
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-/
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theorem thm1 : ∀ x < 100, x * x ≤ 10000 := by decide +kernel
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theorem thm1' : ∀ x < 100, x * x ≤ 10000 := by decide +kernel
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/--
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info: theorem thm1 : ∀ (x : Nat), x < 100 → x * x ≤ 10000 :=
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thm1._proof_1_1
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-/
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#guard_msgs in #print thm1
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/--
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info: theorem thm1' : ∀ (x : Nat), x < 100 → x * x ≤ 10000 :=
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thm1'._proof_1_1
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-/
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#guard_msgs in #print thm1'
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/-!
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Reverting free variables.
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-/
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/--
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error: Expected type must not contain free variables
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x + 1 ≤ 5
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Hint: Use the `+revert` option to automatically clean up and revert free variables
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-/
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#guard_msgs in
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example (x : Nat) (h : x < 5) : x + 1 ≤ 5 := by decide +kernel
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example (x : Nat) (h : x < 5) : x + 1 ≤ 5 := by decide +kernel +revert
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/--
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Can handle universe levels.
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-/
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instance (p : PUnit.{u} → Prop) [Decidable (p PUnit.unit)] : Decidable (∀ x : PUnit.{u}, p x) :=
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decidable_of_iff (p PUnit.unit) (by constructor; rintro _ ⟨⟩; assumption; intro h; apply h)
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example : ∀ (x : PUnit.{u}), x = PUnit.unit := by decide +kernel
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