38 lines
644 B
Text
38 lines
644 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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prelude
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import Init.Data.ToString
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namespace Lean
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inductive LBool
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| false
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| true
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| undef
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namespace LBool
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instance : Inhabited LBool := ⟨false⟩
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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 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 : HasToString 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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