24 lines
860 B
Text
24 lines
860 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, Sebastian Ullrich
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-/
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import Lean.Environment
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namespace Lean
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universe u
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/-- `Eval` extension that gives access to the current environment & options.
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The basic `Eval` class is in the prelude and should not depend on these
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types. -/
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class MetaEval (α : Type u) where
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eval : Environment → Options → α → (hideUnit : Bool) → IO Environment
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instance {α : Type u} [Eval α] : MetaEval α :=
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⟨fun env opts a hideUnit => do Eval.eval (fun _ => a) hideUnit; pure env⟩
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def runMetaEval {α : Type u} [MetaEval α] (env : Environment) (opts : Options) (a : α) : IO (String × Except IO.Error Environment) :=
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IO.FS.withIsolatedStreams (MetaEval.eval env opts a false)
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end Lean
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