Idris2/tests/idris2/perror010/TrailingLam.idr
G. Allais 21c6f4fb79
[ breaking ] remove parsing of dangling binders (#1711)
* [ breaking ] remove parsing of dangling binders

It used to be the case that

```
ID : Type -> Type
ID a = a

test : ID (a : Type) -> a -> a
test = \ a, x => x
```

and

```
head : List $ a -> Maybe a
head [] = Nothing
head (x :: _) = Just x
```

were accepted but these are now rejected because:

* `ID (a : Type) -> a -> a` is parsed as `(ID (a : Type)) -> a -> a`
* `List $ a -> Maybe a` is parsed as `List (a -> Maybe a)`

Similarly if you want to use a lambda / rewrite / let expression as
part of the last argument of an application, the use of `$` or parens
is now mandatory.

This should hopefully allow us to make progress on #1703
2021-08-10 19:24:32 +01:00

7 lines
74 B
Idris

f : (Nat -> Nat) -> Nat
f k = f \n => k (S n)
g : Nat -> Nat
g x = f ?a