Add a test for Adt copy suggestions

matthiaskrgr · Mar 1, 2022 · 879efa8 · 879efa8
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diff --git a/src/test/ui/moves/use_of_moved_value_copy_suggestions.rs b/src/test/ui/moves/use_of_moved_value_copy_suggestions.rs
@@ -0,0 +1,65 @@
+fn duplicate_t<T>(t: T) -> (T, T) {
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_opt<T>(t: Option<T>) -> (Option<T>, Option<T>) {
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_tup1<T>(t: (T,)) -> ((T,), (T,)) {
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_tup2<A, B>(t: (A, B)) -> ((A, B), (A, B)) {
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_custom<T>(t: S<T>) -> (S<T>, S<T>) {
+    (t, t) //~ use of moved value: `t`
+}
+
+struct S<T>(T);
+trait Trait {}
+impl<T: Trait + Clone> Clone for S<T> {
+    fn clone(&self) -> Self {
+        Self(self.0.clone())
+    }
+}
+impl<T: Trait + Copy> Copy for S<T> {}
+
+trait A {}
+trait B {}
+
+// Test where bounds are added with different bound placements
+fn duplicate_custom_1<T>(t: S<T>) -> (S<T>, S<T>) where {
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_custom_2<T>(t: S<T>) -> (S<T>, S<T>)
+where
+    T: A,
+{
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_custom_3<T>(t: S<T>) -> (S<T>, S<T>)
+where
+    T: A,
+    T: B,
+{
+    (t, t) //~ use of moved value: `t`
+}
+
+fn duplicate_custom_4<T: A>(t: S<T>) -> (S<T>, S<T>)
+where
+    T: B,
+{
+    (t, t) //~ use of moved value: `t`
+}
+
+// `Rc` is not ever `Copy`, we should not suggest adding `T: Copy` constraint
+fn duplicate_rc<T>(t: std::rc::Rc<T>) -> (std::rc::Rc<T>, std::rc::Rc<T>) {
+    (t, t) //~ use of moved value: `t`
+}
+
+fn main() {}
diff --git a/src/test/ui/moves/use_of_moved_value_copy_suggestions.stderr b/src/test/ui/moves/use_of_moved_value_copy_suggestions.stderr
@@ -0,0 +1,151 @@
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:2:9
+   |
+LL | fn duplicate_t<T>(t: T) -> (T, T) {
+   |                   - move occurs because `t` has type `T`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider restricting type parameter `T`
+   |
+LL | fn duplicate_t<T: Copy>(t: T) -> (T, T) {
+   |                 ++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:6:9
+   |
+LL | fn duplicate_opt<T>(t: Option<T>) -> (Option<T>, Option<T>) {
+   |                     - move occurs because `t` has type `Option<T>`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider restricting type parameter `T`
+   |
+LL | fn duplicate_opt<T: Copy>(t: Option<T>) -> (Option<T>, Option<T>) {
+   |                   ++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:10:9
+   |
+LL | fn duplicate_tup1<T>(t: (T,)) -> ((T,), (T,)) {
+   |                      - move occurs because `t` has type `(T,)`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider restricting type parameter `T`
+   |
+LL | fn duplicate_tup1<T: Copy>(t: (T,)) -> ((T,), (T,)) {
+   |                    ++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:14:9
+   |
+LL | fn duplicate_tup2<A, B>(t: (A, B)) -> ((A, B), (A, B)) {
+   |                         - move occurs because `t` has type `(A, B)`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider restricting type parameters
+   |
+LL | fn duplicate_tup2<A: Copy, B: Copy>(t: (A, B)) -> ((A, B), (A, B)) {
+   |                    ++++++   ++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:18:9
+   |
+LL | fn duplicate_custom<T>(t: S<T>) -> (S<T>, S<T>) {
+   |                        - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider restricting type parameter `T`
+   |
+LL | fn duplicate_custom<T: Trait + Copy>(t: S<T>) -> (S<T>, S<T>) {
+   |                      ++++++++++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:35:9
+   |
+LL | fn duplicate_custom_1<T>(t: S<T>) -> (S<T>, S<T>) where {
+   |                          - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider restricting type parameter `T`
+   |
+LL | fn duplicate_custom_1<T: Trait + Copy>(t: S<T>) -> (S<T>, S<T>) where {
+   |                        ++++++++++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:42:9
+   |
+LL | fn duplicate_custom_2<T>(t: S<T>) -> (S<T>, S<T>)
+   |                          - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
+...
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider further restricting this bound
+   |
+LL |     T: A + Trait + Copy,
+   |          ++++++++++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:50:9
+   |
+LL | fn duplicate_custom_3<T>(t: S<T>) -> (S<T>, S<T>)
+   |                          - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
+...
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider further restricting type parameter `T`
+   |
+LL |     T: B, T: Trait, T: Copy
+   |         ~~~~~~~~~~~~~~~~~~~
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:57:9
+   |
+LL | fn duplicate_custom_4<T: A>(t: S<T>) -> (S<T>, S<T>)
+   |                             - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
+...
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+   |
+help: consider further restricting this bound
+   |
+LL |     T: B + Trait + Copy,
+   |          ++++++++++++++
+
+error[E0382]: use of moved value: `t`
+  --> $DIR/use_of_moved_value_copy_suggestions.rs:62:9
+   |
+LL | fn duplicate_rc<T>(t: std::rc::Rc<T>) -> (std::rc::Rc<T>, std::rc::Rc<T>) {
+   |                    - move occurs because `t` has type `Rc<T>`, which does not implement the `Copy` trait
+LL |     (t, t)
+   |      -  ^ value used here after move
+   |      |
+   |      value moved here
+
+error: aborting due to 10 previous errors
+
+For more information about this error, try `rustc --explain E0382`.