742ca6afa7
Makes `#eval` use the `elabMutualDef` machinery to process all the `let
rec`s that might appear in the expression. This now works:
```lean
#eval
let rec fact (n : Nat) : Nat :=
match n with
| 0 => 1
| n' + 1 => n * fact n'
fact 5
```
Closes #2374
38 lines
890 B
Text
38 lines
890 B
Text
import Lean.Meta
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open Lean
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open Lean.Meta
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def tst1 : MetaM Unit :=
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withLocalDeclD `y (mkConst `Nat) $ fun y => do
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withLetDecl `x (mkConst `Nat) (mkNatLit 0) $ fun x => do {
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let mvar ← mkFreshExprMVar (mkConst `Nat) MetavarKind.syntheticOpaque;
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trace[Meta.debug] mvar;
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let r ← mkLambdaFVars #[y, x] mvar;
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trace[Message.debug] r;
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let v := mkApp2 (mkConst `Nat.add) x y;
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mvar.mvarId!.assign v;
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trace[Meta.debug] mvar;
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trace[Meta.debug] r;
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let mctx ← getMCtx;
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mctx.decls.forM fun mvarId mvarDecl => do
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trace[Meta.debug] m!"?{mvarId.name} : {mvarDecl.type}"
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}
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set_option pp.mvars false
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set_option trace.Meta.debug true
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/--
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info: [Meta.debug] ?_
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[Meta.debug] x.add y
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[Meta.debug] fun y =>
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let x := 0;
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x.add y
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[Meta.debug] ?_uniq.3019 : Nat →
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Nat →
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let x := 0;
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Nat
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[Meta.debug] ?_uniq.3018 : Nat
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-/
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#guard_msgs in
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#eval tst1
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