Rollup merge of #106497 - chenyukang:yukang/fix-106443-sugg-clone, r=estebank

Suggest using clone when we have &T and T implemented Clone

Fixes #106443

4 files changed, 107 insertions, 0 deletions

diff --git a/src/test/ui/suggestions/issue-106443-sugg-clone-for-arg.rs b/src/test/ui/suggestions/issue-106443-sugg-clone-for-arg.rs
new file mode 100644
index 00000000000..48efdb82c46
--- /dev/null
+++ b/src/test/ui/suggestions/issue-106443-sugg-clone-for-arg.rs
@@ -0,0 +1,23 @@
+#[derive(Clone)]
+struct S;
+
+// without Clone
+struct T;
+
+fn foo(_: S) {}
+
+fn test1() {
+    let s = &S;
+    foo(s); //~ ERROR mismatched types
+}
+
+fn bar(_: T) {}
+fn test2() {
+    let t = &T;
+    bar(t); //~ ERROR mismatched types
+}
+
+fn main() {
+    test1();
+    test2();
+}
diff --git a/src/test/ui/suggestions/issue-106443-sugg-clone-for-arg.stderr b/src/test/ui/suggestions/issue-106443-sugg-clone-for-arg.stderr
new file mode 100644
index 00000000000..1e66fe3af24
--- /dev/null
+++ b/src/test/ui/suggestions/issue-106443-sugg-clone-for-arg.stderr
@@ -0,0 +1,35 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-106443-sugg-clone-for-arg.rs:11:9
+   |
+LL |     foo(s);
+   |     --- ^ expected struct `S`, found `&S`
+   |     |
+   |     arguments to this function are incorrect
+   |
+note: function defined here
+  --> $DIR/issue-106443-sugg-clone-for-arg.rs:7:4
+   |
+LL | fn foo(_: S) {}
+   |    ^^^ ----
+help: consider using clone here
+   |
+LL |     foo(s.clone());
+   |          ++++++++
+
+error[E0308]: mismatched types
+  --> $DIR/issue-106443-sugg-clone-for-arg.rs:17:9
+   |
+LL |     bar(t);
+   |     --- ^ expected struct `T`, found `&T`
+   |     |
+   |     arguments to this function are incorrect
+   |
+note: function defined here
+  --> $DIR/issue-106443-sugg-clone-for-arg.rs:14:4
+   |
+LL | fn bar(_: T) {}
+   |    ^^^ ----
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/suggestions/issue-106443-sugg-clone-for-bound.rs b/src/test/ui/suggestions/issue-106443-sugg-clone-for-bound.rs
new file mode 100644
index 00000000000..3b2e316b296
--- /dev/null
+++ b/src/test/ui/suggestions/issue-106443-sugg-clone-for-bound.rs
@@ -0,0 +1,20 @@
+#[derive(Clone)]
+struct S;
+
+trait X {}
+
+impl X for S {}
+
+fn foo<T: X>(_: T) {}
+fn bar<T: X>(s: &T) {
+    foo(s); //~ ERROR the trait bound `&T: X` is not satisfied
+}
+
+fn bar_with_clone<T: X + Clone>(s: &T) {
+    foo(s); //~ ERROR the trait bound `&T: X` is not satisfied
+}
+
+fn main() {
+    let s = &S;
+    bar(s);
+}
diff --git a/src/test/ui/suggestions/issue-106443-sugg-clone-for-bound.stderr b/src/test/ui/suggestions/issue-106443-sugg-clone-for-bound.stderr
new file mode 100644
index 00000000000..8607917ede6
--- /dev/null
+++ b/src/test/ui/suggestions/issue-106443-sugg-clone-for-bound.stderr
@@ -0,0 +1,29 @@
+error[E0277]: the trait bound `&T: X` is not satisfied
+  --> $DIR/issue-106443-sugg-clone-for-bound.rs:10:9
+   |
+LL |     foo(s);
+   |         ^ the trait `X` is not implemented for `&T`
+   |
+help: consider further restricting this bound
+   |
+LL | fn bar<T: X + Clone>(s: &T) {
+   |             +++++++
+help: consider using clone here
+   |
+LL |     foo(s.clone());
+   |          ++++++++
+
+error[E0277]: the trait bound `&T: X` is not satisfied
+  --> $DIR/issue-106443-sugg-clone-for-bound.rs:14:9
+   |
+LL |     foo(s);
+   |         ^ the trait `X` is not implemented for `&T`
+   |
+help: consider using clone here
+   |
+LL |     foo(s.clone());
+   |          ++++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.