Even more tests

tests/ui/dropck/explicit-drop-bounds.bad1.stderr

@@ -0,0 +1,35 @@
+error[E0277]: the trait bound `T: Copy` is not satisfied
+  --> $DIR/explicit-drop-bounds.rs:27:18
+   |
+LL | impl<T> Drop for DropMe<T>
+   |                  ^^^^^^^^^ the trait `Copy` is not implemented for `T`
+   |
+note: required by a bound in `DropMe`
+  --> $DIR/explicit-drop-bounds.rs:7:18
+   |
+LL | struct DropMe<T: Copy>(T);
+   |                  ^^^^ required by this bound in `DropMe`
+help: consider further restricting type parameter `T`
+   |
+LL |     [T; 1]: Copy, T: std::marker::Copy // But `[T; 1]: Copy` does not imply `T: Copy`
+   |                 ~~~~~~~~~~~~~~~~~~~~~~
+
+error[E0277]: the trait bound `T: Copy` is not satisfied
+  --> $DIR/explicit-drop-bounds.rs:32:13
+   |
+LL |     fn drop(&mut self) {}
+   |             ^^^^^^^^^ the trait `Copy` is not implemented for `T`
+   |
+note: required by a bound in `DropMe`
+  --> $DIR/explicit-drop-bounds.rs:7:18
+   |
+LL | struct DropMe<T: Copy>(T);
+   |                  ^^^^ required by this bound in `DropMe`
+help: consider further restricting type parameter `T`
+   |
+LL |     [T; 1]: Copy, T: std::marker::Copy // But `[T; 1]: Copy` does not imply `T: Copy`
+   |                 ~~~~~~~~~~~~~~~~~~~~~~
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.

tests/ui/dropck/explicit-drop-bounds.bad2.stderr

@@ -0,0 +1,35 @@
+error[E0277]: the trait bound `T: Copy` is not satisfied
+  --> $DIR/explicit-drop-bounds.rs:37:18
+   |
+LL | impl<T> Drop for DropMe<T>
+   |                  ^^^^^^^^^ the trait `Copy` is not implemented for `T`
+   |
+note: required by a bound in `DropMe`
+  --> $DIR/explicit-drop-bounds.rs:7:18
+   |
+LL | struct DropMe<T: Copy>(T);
+   |                  ^^^^ required by this bound in `DropMe`
+help: consider restricting type parameter `T`
+   |
+LL | impl<T: std::marker::Copy> Drop for DropMe<T>
+   |       +++++++++++++++++++
+
+error[E0277]: the trait bound `T: Copy` is not satisfied
+  --> $DIR/explicit-drop-bounds.rs:40:13
+   |
+LL |     fn drop(&mut self) {}
+   |             ^^^^^^^^^ the trait `Copy` is not implemented for `T`
+   |
+note: required by a bound in `DropMe`
+  --> $DIR/explicit-drop-bounds.rs:7:18
+   |
+LL | struct DropMe<T: Copy>(T);
+   |                  ^^^^ required by this bound in `DropMe`
+help: consider restricting type parameter `T`
+   |
+LL | impl<T: std::marker::Copy> Drop for DropMe<T>
+   |       +++++++++++++++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.

tests/ui/dropck/explicit-drop-bounds.rs

@@ -0,0 +1,44 @@
+// revisions: good1 good2 bad1 bad2
+//[good1] check-pass
+//[good2] check-pass
+
+use std::ops::Drop;
+
+struct DropMe<T: Copy>(T);
+
+#[cfg(good1)]
+impl<T> Drop for DropMe<T>
+where
+    T: Copy + Clone,
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(good2)]
+impl<T> Drop for DropMe<T>
+where
+    T: Copy,
+    [T; 1]: Copy, // Trivial bound implied by `T: Copy`
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(bad1)]
+impl<T> Drop for DropMe<T>
+//[bad1]~^ ERROR the trait bound `T: Copy` is not satisfied
+where
+    [T; 1]: Copy, // But `[T; 1]: Copy` does not imply `T: Copy`
+{
+    fn drop(&mut self) {}
+    //[bad1]~^ ERROR the trait bound `T: Copy` is not satisfied
+}
+
+#[cfg(bad2)]
+impl<T> Drop for DropMe<T>
+//[bad2]~^ ERROR the trait bound `T: Copy` is not satisfied
+{
+    fn drop(&mut self) {}
+    //[bad2]~^ ERROR the trait bound `T: Copy` is not satisfied
+}
+
+fn main() {}

tests/ui/dropck/explicit-implied-outlives.bad1.stderr

@@ -0,0 +1,15 @@
+error[E0367]: `Drop` impl requires `T: 'static` but the struct it is implemented for does not
+  --> $DIR/explicit-implied-outlives.rs:28:8
+   |
+LL |     T: 'static,
+   |        ^^^^^^^
+   |
+note: the implementor must specify the same requirement
+  --> $DIR/explicit-implied-outlives.rs:7:1
+   |
+LL | struct DropMe<'a, T>(&'a T);
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0367`.

tests/ui/dropck/explicit-implied-outlives.bad2.stderr

@@ -0,0 +1,15 @@
+error[E0367]: `Drop` impl requires `'a: 'static` but the struct it is implemented for does not
+  --> $DIR/explicit-implied-outlives.rs:37:9
+   |
+LL |     'a: 'static,
+   |         ^^^^^^^
+   |
+note: the implementor must specify the same requirement
+  --> $DIR/explicit-implied-outlives.rs:7:1
+   |
+LL | struct DropMe<'a, T>(&'a T);
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0367`.

tests/ui/dropck/explicit-implied-outlives.rs

@@ -0,0 +1,43 @@
+// revisions: good1 good2 bad1 bad2
+//[good1] check-pass
+//[good2] check-pass
+
+use std::ops::Drop;
+
+struct DropMe<'a, T>(&'a T);
+
+#[cfg(good1)]
+impl<'a, T> Drop for DropMe<'a, T>
+where
+    T: 'a, // Implied by struct, explicit on impl
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(good2)]
+impl<'a, T> Drop for DropMe<'a, T>
+where
+    'static: 'a, // Trivial bound
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(bad1)]
+impl<'a, T> Drop for DropMe<'a, T>
+where
+    T: 'static,
+    //[bad1]~^ ERROR `Drop` impl requires `T: 'static`
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(bad2)]
+impl<'a, T> Drop for DropMe<'a, T>
+where
+    'a: 'static,
+    //[bad2]~^ ERROR `Drop` impl requires `'a: 'static`
+{
+    fn drop(&mut self) {}
+}
+
+fn main() {}

tests/ui/dropck/transitive-outlives-2.rs

@@ -0,0 +1,18 @@
+// check-pass
+
+use std::marker::PhantomData;
+use std::ops::Drop;
+
+// a >= b >= c >= a implies a = b = c
+struct DropMe<'a: 'b, 'b: 'c, 'c: 'a>(
+    PhantomData<&'a ()>,
+    PhantomData<&'b ()>,
+    PhantomData<&'c ()>,
+);
+
+// a >= b, a >= c, b >= a, c >= a implies a = b = c
+impl<'a: 'b + 'c, 'b: 'a, 'c: 'a> Drop for DropMe<'a, 'b, 'c> {
+    fn drop(&mut self) {}
+}
+
+fn main() {}

tests/ui/dropck/transitive-outlives.bad.stderr

@@ -0,0 +1,15 @@
+error[E0367]: `Drop` impl requires `'a: 'c` but the struct it is implemented for does not
+  --> $DIR/transitive-outlives.rs:20:9
+   |
+LL |     'a: 'c,
+   |         ^^
+   |
+note: the implementor must specify the same requirement
+  --> $DIR/transitive-outlives.rs:7:1
+   |
+LL | struct DropMe<'a, 'b: 'a, 'c: 'b>(PhantomData<&'a ()>, PhantomData<&'b ()>, PhantomData<&'c ()>);
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0367`.

tests/ui/dropck/transitive-outlives.rs

@@ -0,0 +1,26 @@
+// revisions: good bad
+//[good] check-pass
+
+use std::marker::PhantomData;
+use std::ops::Drop;
+
+struct DropMe<'a, 'b: 'a, 'c: 'b>(PhantomData<&'a ()>, PhantomData<&'b ()>, PhantomData<&'c ()>);
+
+#[cfg(good)]
+impl<'a, 'b, 'c> Drop for DropMe<'a, 'b, 'c>
+where
+    'c: 'a,
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(bad)]
+impl<'a, 'b, 'c> Drop for DropMe<'a, 'b, 'c>
+where
+    'a: 'c,
+    //[bad]~^ ERROR `Drop` impl requires `'a: 'c`
+{
+    fn drop(&mut self) {}
+}
+
+fn main() {}

tests/ui/dropck/trivial-impl-bounds.rs

@@ -0,0 +1,34 @@
+// revisions: good1 good2 good3
+// check-pass
+
+use std::ops::Drop;
+
+struct Foo;
+
+const X: usize = 1;
+
+#[cfg(good1)]
+impl Drop for Foo
+where
+    [(); X]:, // Trivial WF bound
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(good2)]
+impl Drop for Foo
+where
+    for<'a> &'a (): Copy, // Trivial trait bound
+{
+    fn drop(&mut self) {}
+}
+
+#[cfg(good3)]
+impl Drop for Foo
+where
+    for<'a> &'a (): 'a, // Trivial outlives bound
+{
+    fn drop(&mut self) {}
+}
+
+fn main() {}