tests: add zeroing

tests/zeroing.rs

@@ -0,0 +1,32 @@
+use std::{marker::PhantomPinned, ptr::addr_of_mut};
+
+use pinned_init::*;
+
+const MARKS: usize = 64;
+
+#[pin_data]
+#[derive(Zeroable)]
+pub struct Foo {
+    buf: [u8; 1024 * 1024],
+    marks: [*mut u8; MARKS],
+    pos: usize,
+    #[pin]
+    _pin: PhantomPinned,
+}
+
+impl Foo {
+    pub fn new() -> impl PinInit<Self> {
+        pin_init!(&this in Self {
+            marks: {
+                let ptr = this.as_ptr();
+                let ptr = unsafe { addr_of_mut!((*ptr).buf)}.cast::<u8>();
+                [ptr; MARKS]},
+            ..Zeroable::zeroed()
+        })
+    }
+}
+
+#[test]
+fn test() {
+    let _ = Box::pin_init(Foo::new()).unwrap();
+}