Write {ui,} tests for pin_macro and pin!

Author: danielhenrymantilla

core/tests/lib.rs

@@ -45,6 +45,7 @@
 #![feature(inline_const)]
 #![feature(is_sorted)]
 #![feature(pattern)]
+#![feature(pin_macro)]
 #![feature(sort_internals)]
 #![feature(slice_take)]
 #![feature(maybe_uninit_uninit_array)]
@@ -122,6 +123,7 @@ mod ops;
 mod option;
 mod pattern;
 mod pin;
+mod pin_macro;
 mod ptr;
 mod result;
 mod simd;

core/tests/pin_macro.rs

@@ -0,0 +1,33 @@
+// edition:2021
+use core::{
+    marker::PhantomPinned,
+    mem::{drop as stuff, transmute},
+    pin::{pin, Pin},
+};
+
+#[test]
+fn basic() {
+    let it: Pin<&mut PhantomPinned> = pin!(PhantomPinned);
+    stuff(it);
+}
+
+#[test]
+fn extension_works_through_block() {
+    let it: Pin<&mut PhantomPinned> = { pin!(PhantomPinned) };
+    stuff(it);
+}
+
+#[test]
+fn extension_works_through_unsafe_block() {
+    // "retro-type-inference" works as well.
+    let it: Pin<&mut PhantomPinned> = unsafe { pin!(transmute(())) };
+    stuff(it);
+}
+
+#[test]
+fn unsize_coercion() {
+    let slice: Pin<&mut [PhantomPinned]> = pin!([PhantomPinned; 2]);
+    stuff(slice);
+    let dyn_obj: Pin<&mut dyn Send> = pin!([PhantomPinned; 2]);
+    stuff(dyn_obj);
+}