Lean4
/-- Keywording indicating whether to use a left- or right-fold. -/
meta def foldKind : Lean.ParserDescr✝ :=
ParserDescr.nodeWithAntiquot✝ "foldKind" `Mathlib.Notation3.foldKind
(ParserDescr.binary✝ `orelse
(ParserDescr.nodeWithAntiquot✝ "foldl" `token.foldl
((with_annotate_term"&" @ParserDescr.nonReservedSymbol✝) "foldl" false✝))
(ParserDescr.nodeWithAntiquot✝ "foldr" `token.foldr
((with_annotate_term"&" @ParserDescr.nonReservedSymbol✝) "foldr" false✝)))