b894464191
This PR does the same fix as #6104, but such that it doesn't break the test/the file in `Plausible`. This is done by not creating unused let binders in metavariable types that are made by `elimMVar`. (This is also a positive thing for users looking at metavariable types, for example in error messages) We get rid of `skipAtMostNumBinders`. This function was originally defined for the purpose of making this test work, but it is a hack because it allows cycles in the metavariable context. It would make sense to split these changes into 2 PRs, but I combined them here to show that the combination of them closes #6013 without breaking anything Closes #6013
38 lines
902 B
Text
38 lines
902 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[Meta.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] fun y =>
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let x := 0;
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?_
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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.3037 : Nat
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[Meta.debug] ?_uniq.3038 : Nat → Nat → Nat
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-/
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#guard_msgs in
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#eval tst1
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