104 lines
3 KiB
Text
104 lines
3 KiB
Text
import Lean
|
||
|
||
open Lean
|
||
open Lean.Elab
|
||
open Lean.Elab.Term
|
||
open Lean.Elab.Command
|
||
open Std.Format open Std
|
||
open Lean.PrettyPrinter
|
||
|
||
open Lean.Meta
|
||
|
||
def checkM (stx : TermElabM Syntax) (optionsPerPos : OptionsPerPos := {}) : TermElabM Unit := do
|
||
let opts ← getOptions
|
||
let stx ← stx
|
||
let e ← elabTermAndSynthesize stx none <* throwErrorIfErrors
|
||
let stx' ← delab Name.anonymous [] e optionsPerPos
|
||
let f' ← PrettyPrinter.ppTerm stx'
|
||
let s := f'.pretty' opts
|
||
IO.println s
|
||
let env ← getEnv
|
||
match Parser.runParserCategory env `term s "<input>" with
|
||
| Except.error e => throwErrorAt stx e
|
||
| Except.ok stx'' => do
|
||
let e' ← elabTermAndSynthesize stx'' none <* throwErrorIfErrors
|
||
unless (← isDefEq e e') do
|
||
throwErrorAt stx (m!"failed to round-trip" ++ line ++ fmt e ++ line ++ fmt e')
|
||
|
||
-- set_option trace.PrettyPrinter.parenthesize true
|
||
set_option format.width 20
|
||
|
||
-- #eval checkM `(?m) -- fails round-trip
|
||
|
||
#eval checkM `(Sort)
|
||
#eval checkM `(Type)
|
||
#eval checkM `(Type 0)
|
||
#eval checkM `(Type 1)
|
||
-- TODO: we need support for parsing `?u` to roundtrip the terms containing universe metavariables. Just pretty printing them as `_` is bad for error and trace messages
|
||
-- #eval checkM `(Type _)
|
||
-- #eval checkM `(Type (_ + 2))
|
||
|
||
#eval checkM `(Nat)
|
||
#eval checkM `(List Nat)
|
||
#eval checkM `(id Nat)
|
||
#eval checkM `(id (id (id Nat)))
|
||
section
|
||
set_option pp.explicit true
|
||
#eval checkM `(List Nat)
|
||
#eval checkM `(id Nat)
|
||
end
|
||
section
|
||
set_option pp.universes true
|
||
#eval checkM `(List Nat)
|
||
#eval checkM `(id Nat)
|
||
#eval checkM `(Sum Nat Nat)
|
||
end
|
||
#eval checkM `(id (id Nat)) (Std.RBMap.empty.insert 4 $ KVMap.empty.insert `pp.explicit true)
|
||
|
||
-- specify the expected type of `a` in a way that is not erased by the delaborator
|
||
def typeAs.{u} (α : Type u) (a : α) := ()
|
||
|
||
#eval checkM `(fun (a : Nat) => a)
|
||
#eval checkM `(fun (a b : Nat) => a)
|
||
#eval checkM `(fun (a : Nat) (b : Bool) => a)
|
||
#eval checkM `(fun {a b : Nat} => a)
|
||
-- implicit lambdas work as long as the expected type is preserved
|
||
#eval checkM `(typeAs ({α : Type} → (a : α) → α) fun a => a)
|
||
section
|
||
set_option pp.explicit true
|
||
#eval checkM `(fun {α : Type} [ToString α] (a : α) => toString a)
|
||
end
|
||
|
||
#eval checkM `((α : Type) → α)
|
||
#eval checkM `((α β : Type) → α) -- group
|
||
#eval checkM `((α β : Type) → Type) -- don't group
|
||
#eval checkM `((α : Type) → (a : α) → α)
|
||
#eval checkM `({α : Type} → α)
|
||
#eval checkM `({α : Type} → [ToString α] → α)
|
||
#eval checkM `(∀ x : Nat, x = x)
|
||
#eval checkM `(∀ {x : Nat} [ToString Nat], x = x)
|
||
set_option pp.binder_types false in
|
||
#eval checkM `(∀ x : Nat, x = x)
|
||
|
||
-- TODO: hide `ofNat`
|
||
#eval checkM `(0)
|
||
#eval checkM `(1)
|
||
#eval checkM `(42)
|
||
#eval checkM `("hi")
|
||
|
||
set_option pp.structure_instance_type true in
|
||
#eval checkM `({ type := Nat, val := 0 : PointedType })
|
||
#eval checkM `((1,2,3))
|
||
#eval checkM `((1,2).fst)
|
||
|
||
#eval checkM `(1 < 2 || true)
|
||
|
||
#eval checkM `(id (fun a => a) 0)
|
||
|
||
#eval checkM `(typeAs Nat (do
|
||
let x ← pure 1
|
||
discard <| pure 2
|
||
let y := 3
|
||
return x + y))
|
||
|
||
#eval checkM `(typeAs (Id Nat) (pure 1 >>= pure))
|