Fix drop ref and stack

Author: arnodb

compile-tests/tests/compile-fail/drop_ref.rs

@@ -0,0 +1,16 @@
+extern crate ref_mut_stack;
+
+use ref_mut_stack::{ParkableRefMut, RefMutStack};
+
+fn main() {
+    struct Root;
+
+    let mut root = Root;
+
+    struct Type<'a>(ParkableRefMut<'a, Root, Self>);
+
+    let mut stack = RefMutStack::<Root, Type>::new(&mut root);
+    drop(root);
+    //~^ ERROR 13:10: 13:14: cannot move out of `root` because it is borrowed [E0505]
+    stack.borrow_mut();
+}

compile-tests/tests/compile-fail/drop_stack.rs

@@ -0,0 +1,16 @@
+extern crate ref_mut_stack;
+
+use ref_mut_stack::{ParkableRefMut, RefMutStack};
+
+fn main() {
+    struct Root;
+
+    let mut root = Root;
+
+    struct Type<'a>(ParkableRefMut<'a, Root, Self>);
+
+    let mut stack = RefMutStack::<Root, Type>::new(&mut root);
+    let r = stack.borrow_mut();
+    drop(stack);
+    //~^ ERROR 14:10: 14:15: cannot move out of `stack` because it is borrowed [E0505]
+}

justfile

@@ -17,6 +17,10 @@ watch_clippy:
 test *args:
     cargo test --all-features {{args}}
 
+[working-directory: 'compile-tests']
+compile-test *args:
+    cargo test --all-features {{args}}
+
 miri:
     cargo miri test --all-features
 

src/lib.rs

@@ -10,7 +10,7 @@ pub struct RefMutStack<'a, R, T> {
 }
 
 impl<'a, R, T> RefMutStack<'a, R, T> {
-    pub fn new(r: &mut R) -> Self {
+    pub fn new(r: &'a mut R) -> Self {
         Self {
             root_ref: NonNull::from_mut(r),
             stack: Vec::new(),