Rollup merge of #146907 - cyrgani:146537-test, r=nnethercote

add regression test for issue 146537

Adds a test based on the reduction in #146537 (comment).
This was already fixed in #142882 before the issue was even reported, but no test for it was added yet.

Author: matthiaskrgr

tests/ui/suggestions/non_copy_move_out_of_tuple.rs

@@ -0,0 +1,8 @@
+// Regression test for #146537.
+
+struct NonCopy;
+fn main() {
+    let tuple = &(NonCopy,);
+    let b: NonCopy;
+    (b,) = *tuple; //~ ERROR: cannot move out of `tuple.0` which is behind a shared reference [E0507]
+}

tests/ui/suggestions/non_copy_move_out_of_tuple.stderr

@@ -0,0 +1,26 @@
+error[E0507]: cannot move out of `tuple.0` which is behind a shared reference
+  --> $DIR/non_copy_move_out_of_tuple.rs:7:12
+   |
+LL |     (b,) = *tuple;
+   |      -     ^^^^^^
+   |      |
+   |      data moved here
+   |      move occurs because the place has type `NonCopy`, which does not implement the `Copy` trait
+   |
+note: if `NonCopy` implemented `Clone`, you could clone the value
+  --> $DIR/non_copy_move_out_of_tuple.rs:3:1
+   |
+LL | struct NonCopy;
+   | ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
+...
+LL |     (b,) = *tuple;
+   |      - you could clone this value
+help: consider removing the dereference here
+   |
+LL -     (b,) = *tuple;
+LL +     (b,) = tuple;
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0507`.