e9d85f49e6
Based on the discussion at https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/for.2C.20unexpected.20need.20for.20type.20ascription/near/269083574 The consensus seemed to be that "auto pure" is more confusing than its worth.
57 lines
1.5 KiB
Text
57 lines
1.5 KiB
Text
import Lean.CoreM
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open Lean
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structure MyState :=
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(trace_state : TraceState := {})
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(s : Nat := 0)
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abbrev M := CoreM
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def tst1 : M Unit :=
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do trace[module] (m!"hello" ++ MessageData.nest 9 (m!"\n" ++ "world"));
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trace[module.aux] "another message";
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pure ()
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def tst2 (b : Bool) : M Unit :=
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traceCtx `module $ do
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tst1;
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trace[bughunt] "at test2";
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if b then throwError "error";
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tst1;
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pure ()
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partial def ack : Nat → Nat → Nat
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| 0, n => n+1
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| m+1, 0 => ack m 1
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| m+1, n+1 => ack m (ack (m+1) n)
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def slow (b : Bool) : Nat :=
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ack 4 (cond b 0 1)
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def tst3 (b : Bool) : M Unit :=
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do traceCtx `module $ do {
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tst2 b;
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tst1
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};
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trace[bughunt] "at end of tst3";
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-- Messages are computed lazily. The following message will only be computed
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-- if `trace.slow is active.
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trace[slow] (m!"slow message: " ++ toString (slow b))
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-- This is true even if it is a monad computation:
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trace[slow] (m!"slow message: " ++ (toString (slow b)))
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def run (x : M Unit) : M Unit :=
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withReader
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(fun ctx =>
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-- Try commeting/uncommeting the following `setBool`s
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let opts := ctx.options;
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let opts := opts.setBool `trace.module true;
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-- let opts := opts.setBool `trace.module.aux false;
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let opts := opts.setBool `trace.bughunt true;
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-- let opts := opts.setBool `trace.slow true;
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{ ctx with options := opts })
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(tryCatch (tryFinally x printTraces) (fun _ => IO.println "ERROR"))
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#eval run (tst3 true)
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#eval run (tst3 false)
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