On Thu, 2015-11-26 at 16:07 +0300, effectfully wrote: > Also, could someone say why it's not possible to `postulate' in a > let-declaration? > postulate foo : Foo does not work under `let'. Instead it works foo : Foo foo = anything where anything is declared globally as postulate anything : ∀ {a} {A : Set a} → A Regards, ------ Sergei