33e63bb6c3
This PR marks the context argument of `ReaderT` as borrowed, causing a wide spread of useful borrow annotations throughout the entire meta stack which reduces RC pressure. This introduces a crucial new behavior: When modifying `ReaderT` context, e.g. through `withReader` this will almost always cause an allocation. Given that the `ReaderT` context is frequently used in a non-linear fashion anyways we think this is an acceptable behavior.
57 lines
2.4 KiB
Text
57 lines
2.4 KiB
Text
import Lean
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/-- `erased α` is the same as `α`, except that the elements
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of `erased α` are erased in the VM in the same way as types
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and proofs. This can be used to track data without storing it
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literally. -/
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def Erased (α : Sort u) : Sort max 1 u :=
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Σ's : α → Prop, ∃ a, (fun b => a = b) = s
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namespace Erased
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/-- Erase a value. -/
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@[inline]
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def mk {α} (a : α) : Erased α :=
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⟨fun b => a = b, a, rfl⟩
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open Lean.Compiler
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set_option pp.explicit true
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set_option pp.funBinderTypes true
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set_option pp.letVarTypes true
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set_option trace.Compiler.saveMono true
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/--
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trace: [Compiler.saveMono] size: 1
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def Erased.mk (α : lcErased) (a : lcAny) : PSigma lcErased lcAny :=
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let _x.1 : PSigma lcErased lcAny := PSigma.mk ◾ ◾ ◾ ◾;
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return _x.1
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---
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trace: [Compiler.saveMono] size: 5
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def _private.elab.erased.0._eval._lam_0 (_x.1 : Array
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Lean.Name) (_x.2 : PUnit) (_y.3 : Lean.Elab.Term.Context) (_y.4 : @&lcAny) (_y.5 : @&Lean.Meta.Context) (_y.6 : @&lcAny) (_y.7 : @&Lean.Core.Context) (_y.8 : @&lcAny) (_y.9 : lcVoid) : EST.Out
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Lean.Exception lcAny PUnit :=
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let _x.10 : EST.Out Lean.Exception lcAny PUnit := compile _x.1 _y.7 _y.8 _y.9;
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cases _x.10 : EST.Out Lean.Exception lcAny PUnit
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| EST.Out.ok (a.11 : PUnit) (a.12 : lcVoid) =>
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let _x.13 : EST.Out Lean.Exception lcAny PUnit := @EST.Out.ok ◾ ◾ ◾ _x.2 a.12;
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return _x.13
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| EST.Out.error (a.14 : Lean.Exception) (a.15 : lcVoid) =>
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return _x.10
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[Compiler.saveMono] size: 9
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def _private.elab.erased.0._eval (a : @&Lean.Elab.Command.Context) (a : @&lcAny) (a.1 : lcVoid) : EST.Out
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Lean.Exception lcAny PUnit :=
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let _x.2 : String := "Erased";
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let _x.3 : String := "mk";
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let _x.4 : Lean.Name := Lean.Name.mkStr2 _x.2 _x.3;
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let _x.5 : Nat := 1;
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let _x.6 : Array Lean.Name := Array.mkEmpty ◾ _x.5;
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let _x.7 : Array Lean.Name := Array.push ◾ _x.6 _x.4;
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let _x.8 : PUnit := PUnit.unit;
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let _f.9 : Lean.Elab.Term.Context →
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lcAny →
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Lean.Meta.Context →
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lcAny → Lean.Core.Context → lcAny → lcVoid → EST.Out Lean.Exception lcAny PUnit := _eval._lam_0 _x.7 _x.8;
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let _x.10 : EST.Out Lean.Exception lcAny PUnit := Lean.Elab.Command.liftTermElabM._redArg _f.9 a a a.1;
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return _x.10
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-/
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#guard_msgs in
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run_meta Lean.Compiler.compile #[``Erased.mk]
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