lean4-htt/tests/lean/Delaborator.lean
2020-03-24 17:27:10 +01:00

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import Init.Lean
open Lean
open Lean.Elab
open Lean.Elab.Term
def check (stx : TermElabM Syntax) (optionsPerPos : OptionsPerPos := {}) : TermElabM Unit := do
stx ← stx;
opts ← getOptions;
e ← elabTermAndSynthesize stx none <* throwErrorIfErrors;
stx' ← liftMetaM stx $ delab e opts optionsPerPos;
dbgTrace $ toString stx';
e' ← elabTermAndSynthesize stx' none <* throwErrorIfErrors;
unlessM (isDefEq stx e e') $
throwError stx "failed to round-trip"
-- #eval check `(?m) -- fails round-trip
#eval check `(Sort)
#eval check `(Type)
#eval check `(Type 0)
#eval check `(Type 1)
-- can't add a new universe variable inside a term...
#eval check `(Type _)
#eval check `(Type (_ + 2))
#eval check `(Nat)
#eval check `(List Nat)
#eval check `(id Nat)
section
set_option pp.explicit true
#eval check `(List Nat)
#eval check `(id Nat)
end
section
set_option pp.universes true
#eval check `(List Nat)
#eval check `(id Nat)
end
#eval check `(id (id Nat)) (RBMap.empty.insert 4 $ KVMap.empty.insert `pp.explicit true)
#eval check `(fun (a : Nat) => a)
#eval check `(fun (a b : Nat) => a)
#eval check `(fun (a : Nat) (b : Bool) => a)
#eval check `(@(fun {a b : Nat} => a))
#eval check `(@(fun {α} [HasToString α] => true))
-- TODO: hide `ofNat`
#eval check `(0)
#eval check `(1)
#eval check `(42)
#eval check `("hi")
#eval check `((1,2).fst)
#eval check `(1 < 2 || true)