pub fn try_up_via(
decl: DeclarationPtr,
lu: &Box<dyn Fn(&DeclarationPtr) -> Option<Literal> + '_>,
) -> Result<Literal, ReprUpError>pub fn try_up_via(
decl: DeclarationPtr,
lu: &Box<dyn Fn(&DeclarationPtr) -> Option<Literal> + '_>,
) -> Result<Literal, ReprUpError>