Idris2-boot/tests/idris2/error002/Error.idr

data Vect : Nat -> Type -> Type where
     Nil : Vect Z a
     (::) : a -> Vect k a -> Vect (S k) a

wrong : a -> Vect (S n) a -> Vect (S n) a
wrong xs = x :: ys
Add error message tests 2019-06-25 23:46:28 +03:00			`data Vect : Nat -> Type -> Type where`
			`Nil : Vect Z a`
			`(::) : a -> Vect k a -> Vect (S k) a`

			`wrong : a -> Vect (S n) a -> Vect (S n) a`
Rabbit hole Sorry for the less than informative title :). Lots going on here. It started as an attempt to fix unification to deal with laziness coercions in trickier places, but unearthed a couple of tricky and interconnected issues that are hard to unpick into a single patch. So, this fixes a few things: - default hints should only be resolved on the current elaboration (e.g. nested function definitions, not the outer definition which might not yet be complete) - delayed elaborators should be allowed to have nested delayed elaborators, which means disambiguation is a little bit better - we should delay elaborating arguments where the type isn't known yet, because later arguments may resolve the type, and we can use this to help with disambiguation/laziness coercions - other bits and pieces arising 2020-03-27 03:11:21 +03:00			`wrong xs = x :: ys`