fn __action4<'i, L>(
ctx: &ParseContext,
(_, l, _): (LexerPosition, LexerPosition, LexerPosition),
(_, e, _): (LexerPosition, Token, LexerPosition),
(_, r, _): (LexerPosition, LexerPosition, LexerPosition),
) -> Exprwhere
L: HasLexerError,