[Elab.command] #check foo true
true : Bool
[Elab.step] expected type: <not-available>, term
foo true
[Elab.step] expected type: <not-available>, term
  true
  [Elab.app.args] explicit: false, ellipsis: false, true : Bool
    [Elab.app.args] namedArgs: []
    [Elab.app.args] args: []
    [Elab.app.finalize] true
    [Elab.app.finalize] after etaArgs, true : Bool
[Elab.command] end
[Elab.command] #check bla true
true : Bool
[Elab.step] expected type: <not-available>, term
bla true
[Elab.step] expected type: <not-available>, term
  true
  [Elab.app.args] explicit: false, ellipsis: false, true : Bool
    [Elab.app.args] namedArgs: []
    [Elab.app.args] args: []
    [Elab.app.finalize] true
    [Elab.app.finalize] after etaArgs, true : Bool
[Elab.command] end
def Bla.bla : Lean.ParserDescr :=
Lean.ParserDescr.node `Bla.bla 1022
  (Lean.ParserDescr.binary `andthen (Lean.ParserDescr.symbol "bla") (Lean.ParserDescr.cat `term 0))