collect tests

output/src/lib.rs

@@ -64,7 +64,6 @@ pub type Perhaps<T> = Result<Option<T>, Box<dyn Error>>;
 #[cfg(test)] mod test {
     use crate::*;
     use proptest::{prelude::*, option::of};
-    use proptest::option::of;
 
     proptest! {
         #[test] fn proptest_direction (

output/src/ops/bsp.rs

@@ -1,7 +1,11 @@
 use crate::*;
 pub use Direction::*;
 /// A split or layer.
-pub struct Bsp<X, Y>(Direction, X, Y);
+pub struct Bsp<A, B>(
+    pub(crate) Direction,
+    pub(crate) A,
+    pub(crate) B,
+);
 impl<E: Output, A: Content<E>, B: Content<E>> Content<E> for Bsp<A, B> {
     fn layout (&self, outer: E::Area) -> E::Area {
         let [_, _, c] = self.areas(outer);