cdc923167e
This PR adds the `nondep` field of `Expr.letE` to the C++ data model. Previously this field has been unused, and in followup PRs the elaborator will use it to encode `have` expressions (non-dependent `let`s). The kernel does not verify that `nondep` is correctly applied during typechecking. The `letE` delaborator now prints `have`s when `nondep` is true, though `have` still elaborates as `letFun` for now. Breaking change: `Expr.updateLet!` is renamed to `Expr.updateLetE!`. This PR also fixes a bug in `Expr.letFun?` and `Expr.letFunAppArgs?` when the body is not a lambda. In any case, these functions will be removed once the `Expr.letE (nondep := true)` encoding of `have` expressions is complete.
36 lines
1.3 KiB
Text
36 lines
1.3 KiB
Text
import Lean.Expr
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open Lean
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def main : IO Unit :=
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do let f := mkConst `f [];
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let x := mkConst `x [];
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let y := mkConst `y [];
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let t1 := mkApp f x;
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let t2 := t1.updateApp! f y;
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let t3 := t1.updateApp! f x;
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let t4 := mkProj `Prod 1 x;
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let t5 := t4.updateProj! y;
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let t6 := t4.updateProj! x;
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let x₁ := x.updateConst! [levelOne];
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let x₂ := x.updateConst! [];
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let s := mkSort levelOne;
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let s₁ := s.updateSort! levelOne;
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let s₂ := s.updateSort! levelZero;
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let a := mkForall `x BinderInfo.default s s;
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let a₁ := a.updateForall! BinderInfo.default s s;
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let a₂ := a.updateForall! BinderInfo.default s₂ s;
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let nat := mkConst `Nat [];
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let id := mkLambda `x BinderInfo.default nat (mkBVar 0);
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let id₁ := id.updateLambda! BinderInfo.default s (mkBVar 0);
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let id₂ := id.updateLambda! BinderInfo.default nat (mkBVar 0);
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let l := mkLet `z nat x t1;
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let l₁ := l.updateLetE! nat x t2;
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let l₂ := l.updateLetE! nat x t1;
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IO.println [t1, t2, t3, t5, t6, x₁, x₂, s₁, s₂, a₁, a₂, id₁, id₂, l₁, l₂];
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pure ()
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/--
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info: [f x, f y, f x, y.2, x.2, x.{1}, x, Type, Prop, Type -> Type, Prop -> Type, fun (x : Type) => x, fun (x : Nat) => x, let z : Nat := x; f y, let z : Nat := x; f x]
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-/
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#guard_msgs in
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#eval main
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