add tests

tests/ui/snapshot/leaked-vars-issue-114056.rs

@@ -0,0 +1,10 @@
+// Regression test for #114056. Fixed by #111516.
+struct P<Q>(Q);
+impl<Q> P<Q> {
+    fn foo(&self) {
+        self.partial_cmp(())
+        //~^ ERROR the method `partial_cmp` exists for reference `&P<Q>`
+    }
+}
+
+fn main() {}

tests/ui/snapshot/leaked-vars-issue-114056.stderr

@@ -0,0 +1,27 @@
+error[E0599]: the method `partial_cmp` exists for reference `&P<Q>`, but its trait bounds were not satisfied
+  --> $DIR/leaked-vars-issue-114056.rs:5:14
+   |
+LL | struct P<Q>(Q);
+   | ----------- doesn't satisfy `P<Q>: Iterator` or `P<Q>: PartialOrd<_>`
+...
+LL |         self.partial_cmp(())
+   |              ^^^^^^^^^^^ method cannot be called on `&P<Q>` due to unsatisfied trait bounds
+   |
+   = note: the following trait bounds were not satisfied:
+           `P<Q>: PartialOrd<_>`
+           which is required by `&P<Q>: PartialOrd<&_>`
+           `&P<Q>: Iterator`
+           which is required by `&mut &P<Q>: Iterator`
+           `P<Q>: Iterator`
+           which is required by `&mut P<Q>: Iterator`
+note: the trait `Iterator` must be implemented
+  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
+help: consider annotating `P<Q>` with `#[derive(PartialEq, PartialOrd)]`
+   |
+LL + #[derive(PartialEq, PartialOrd)]
+LL | struct P<Q>(Q);
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0599`.

tests/ui/snapshot/leaked-vars-issue-122098.rs

@@ -0,0 +1,14 @@
+// Regression test for #122098. Has been slightly minimized, fixed by #122189.
+trait LendingIterator: Sized {
+    type Item<'q>;
+
+    fn for_each(self, f: Box<dyn FnMut(Self::Item<'_>)>) {}
+}
+
+struct Query;
+fn main() {
+    LendingIterator::for_each(Query, Box::new);
+    //~^ ERROR the trait bound `Query: LendingIterator` is not satisfied
+    //~| ERROR mismatched types
+    //~| ERROR the trait bound `Query: LendingIterator` is not satisfied
+}

tests/ui/snapshot/leaked-vars-issue-122098.stderr

@@ -0,0 +1,46 @@
+error[E0277]: the trait bound `Query: LendingIterator` is not satisfied
+  --> $DIR/leaked-vars-issue-122098.rs:10:31
+   |
+LL |     LendingIterator::for_each(Query, Box::new);
+   |     ------------------------- ^^^^^ the trait `LendingIterator` is not implemented for `Query`
+   |     |
+   |     required by a bound introduced by this call
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/leaked-vars-issue-122098.rs:2:1
+   |
+LL | trait LendingIterator: Sized {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/leaked-vars-issue-122098.rs:10:38
+   |
+LL |     LendingIterator::for_each(Query, Box::new);
+   |     -------------------------        ^^^^^^^^ expected `Box<dyn FnMut(...)>`, found fn item
+   |     |
+   |     arguments to this function are incorrect
+   |
+   = note: expected struct `Box<(dyn for<'a> FnMut(<Query as LendingIterator>::Item<'a>) + 'static)>`
+             found fn item `fn(_) -> Box<_> {Box::<_>::new}`
+note: method defined here
+  --> $DIR/leaked-vars-issue-122098.rs:5:8
+   |
+LL |     fn for_each(self, f: Box<dyn FnMut(Self::Item<'_>)>) {}
+   |        ^^^^^^^^       ---------------------------------
+
+error[E0277]: the trait bound `Query: LendingIterator` is not satisfied
+  --> $DIR/leaked-vars-issue-122098.rs:10:38
+   |
+LL |     LendingIterator::for_each(Query, Box::new);
+   |                                      ^^^^^^^^ the trait `LendingIterator` is not implemented for `Query`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/leaked-vars-issue-122098.rs:2:1
+   |
+LL | trait LendingIterator: Sized {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0277, E0308.
+For more information about an error, try `rustc --explain E0277`.