43 lines
826 B
Text
43 lines
826 B
Text
import Lean.Meta
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open Lean
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open Lean.Meta
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universes u v w
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abbrev M := ExceptT String $ MetaM
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def testM {α} [HasBeq α] [HasToString α] (x : M α) (expected : α) : MetaM Unit := do
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r ← x;
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match r with
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| Except.ok a => unless (a == expected) $ throwError ("unexpected result " ++ toString a)
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| Except.error e => throwError ("FAILED: " ++ e)
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@[noinline] def act1 : M Nat :=
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throwThe Exception $ Exception.core { msg := "Error at act1" }
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def g1 : M Nat :=
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catchThe Meta.Exception
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(catch act1 (fun ex => pure 100))
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(fun ex => pure 200)
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#eval testM g1 200
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@[noinline] def act2 : M Nat :=
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throw "hello world"
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def g2 : M Nat :=
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catchThe Meta.Exception
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(catch act2 (fun ex => pure 100))
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(fun ex => pure 200)
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#eval testM g2 100
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def h1 : CoreM Nat :=
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pure 10
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#eval h1
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def h2 : MetaM Nat :=
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pure 20
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#eval h2
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