36 lines
1.2 KiB
Text
36 lines
1.2 KiB
Text
@[inline] def f {α} (s : String) (x : IO α) : IO α := do
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IO.println "started";
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IO.println s;
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let a ← x;
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IO.println ("ended");
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pure a
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@[inline] def f'' {α m} [MonadControlT IO m] [Monad m] (msg : String) (x : m α) : m α := do
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controlAt IO fun runInBase => f msg (runInBase x)
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abbrev M := StateT Bool $ ExceptT String $ StateT String $ ReaderT Nat $ StateT Nat IO
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def tst : M Nat := do
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let a ← f'' "hello" do {
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let s ← getThe Nat; let ctx ← read; modifyThe Nat fun s => s + ctx; if s > 10 then { throw "ERROR" }; getThe Nat };
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modifyThe Nat Nat.succ;
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pure a
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#eval (((tst.run true).run "world").run 1000).run 11
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@[inline] def g {α} (s : String) (x : Nat → IO α) : IO α := do
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IO.println "started";
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IO.println s;
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let a ← x s.length;
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IO.println ("ended");
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pure a
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@[inline] def g' {α m} [MonadControlT IO m] [Monad m] (msg : String) (x : Nat → m α) : m α := do
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controlAt IO fun runInBase => g msg (fun n => runInBase (x n))
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def tst2 : M Nat := do
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let a ← g' "hello" fun x => do { let s ← getThe Nat; let ctx ← read; modifyThe Nat fun s => s + ctx + x; if s > 10 then { throw "ERROR" }; getThe Nat };
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modifyThe Nat Nat.succ;
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pure a
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#eval (((tst2.run true).run "world").run 1000).run 10
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