49 lines
883 B
Text
49 lines
883 B
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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module
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prelude
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public import Init.Data.ToString.Basic
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public section
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namespace Lean
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inductive LBool where
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| false
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| true
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| undef
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deriving Inhabited, BEq
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namespace LBool
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def neg : LBool → LBool
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| true => false
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| false => true
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| undef => undef
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def and : LBool → LBool → LBool
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| true, b => b
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| a, _ => a
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def toString : LBool → String
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| true => "true"
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| false => "false"
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| undef => "undef"
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instance : ToString LBool := ⟨toString⟩
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end LBool
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end Lean
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def Bool.toLBool : Bool → Lean.LBool
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| true => Lean.LBool.true
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| false => Lean.LBool.false
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@[inline] def toLBoolM {m : Type → Type} [Monad m] (x : m Bool) : m Lean.LBool := do
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let b ← x
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pure b.toLBool
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