Relocate issues/issue-51154.rs to closures/box-generic-closure.rs

Author: reddevilmidzy

tests/ui/closures/box-generic-closure.rs

@@ -0,0 +1,10 @@
+//! Regression test for issue <https://github.com/rust-lang/rust/issues/51154>
+//! Test that anonymous closure types cannot be coerced to a generic type
+//! parameter (F: FnMut()) when trying to box them.
+
+fn foo<F: FnMut()>() {
+    let _: Box<F> = Box::new(|| ());
+    //~^ ERROR mismatched types
+}
+
+fn main() {}

tests/ui/issues/issue-51154.stderr renamed to tests/ui/closures/box-generic-closure.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-51154.rs:2:30
+  --> $DIR/box-generic-closure.rs:6:30
    |
 LL | fn foo<F: FnMut()>() {
    |        - expected this type parameter
@@ -9,7 +9,7 @@ LL |     let _: Box<F> = Box::new(|| ());
    |                     arguments to this function are incorrect
    |
    = note: expected type parameter `F`
-                     found closure `{closure@$DIR/issue-51154.rs:2:30: 2:32}`
+                     found closure `{closure@$DIR/box-generic-closure.rs:6:30: 6:32}`
    = help: every closure has a distinct type and so could not always match the caller-chosen type of parameter `F`
 note: associated function defined here
   --> $SRC_DIR/alloc/src/boxed.rs:LL:COL