Rollup merge of #84313 - lcnr:sized-err-msg, r=petrochenkov

fix suggestion for unsized function parameters

taken from `@fasterthanlime's` article https://fasterthanli.me/articles/whats-in-the-box

2 files changed, 11 insertions, 12 deletions

diff --git a/src/test/ui/issues/issue-5883.rs b/src/test/ui/issues/issue-5883.rs
index 0de53502397..82866b35557 100644
--- a/src/test/ui/issues/issue-5883.rs
+++ b/src/test/ui/issues/issue-5883.rs
@@ -4,9 +4,9 @@ struct Struct {
     r: dyn A + 'static
 }
 
-fn new_struct(r: dyn A + 'static)
-    -> Struct { //~^ ERROR the size for values of type
-    //~^ ERROR the size for values of type
+fn new_struct(
+    r: dyn A + 'static //~ ERROR the size for values of type
+) -> Struct {          //~ ERROR the size for values of type
     Struct { r: r }
 }
 
diff --git a/src/test/ui/issues/issue-5883.stderr b/src/test/ui/issues/issue-5883.stderr
index 48879eb798f..de598a70ee0 100644
--- a/src/test/ui/issues/issue-5883.stderr
+++ b/src/test/ui/issues/issue-5883.stderr
@@ -1,22 +1,21 @@
 error[E0277]: the size for values of type `(dyn A + 'static)` cannot be known at compilation time
-  --> $DIR/issue-5883.rs:7:15
+  --> $DIR/issue-5883.rs:8:5
    |
-LL | fn new_struct(r: dyn A + 'static)
-   |               ^ doesn't have a size known at compile-time
+LL |     r: dyn A + 'static
+   |     ^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn A + 'static)`
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |
-LL | fn new_struct(&r: dyn A + 'static)
-   |               ^
+LL |     r: &dyn A + 'static
+   |        ^
 
 error[E0277]: the size for values of type `(dyn A + 'static)` cannot be known at compilation time
-  --> $DIR/issue-5883.rs:8:8
+  --> $DIR/issue-5883.rs:9:6
    |
-LL |     -> Struct {
-   |        ^^^^^^ doesn't have a size known at compile-time
-LL |
+LL | ) -> Struct {
+   |      ^^^^^^ doesn't have a size known at compile-time
 LL |     Struct { r: r }
    |     --------------- this returned value is of type `Struct`
    |