Make expression writing more natural.

[gzp79]

Have you considered implementing the +-* traits on simpleexpr and ident ? This way writing expressions might be more natural. Unfortunately == && || won't work.

Another option could be some macro: expression!( Persons.Age + 2 > value(12))

[tyt2y3]

Yes. But there are plently of quirks, for example, PartialEq::eq require that the return value is bool, which does not work for us.

A macro with a custom DSL is the only way to go. I myself am not an advocate of DSL, but I could accept a PR if someone came up with a brilliant design!