diagnostics: do not suggest type name tweaks on type-inferred closure args

Fixes #111932

tests/ui/closures/issue-111932.rs

@@ -0,0 +1,9 @@
+trait Foo: std::fmt::Debug {}
+
+fn print_foos(foos: impl Iterator<Item = dyn Foo>) {
+    foos.for_each(|foo| { //~ ERROR [E0277]
+        println!("{:?}", foo); //~ ERROR [E0277]
+    });
+}
+
+fn main() {}

tests/ui/closures/issue-111932.stderr

@@ -0,0 +1,26 @@
+error[E0277]: the size for values of type `(dyn Foo + 'static)` cannot be known at compilation time
+  --> $DIR/issue-111932.rs:4:20
+   |
+LL |     foos.for_each(|foo| {
+   |                    ^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `(dyn Foo + 'static)`
+   = note: all function arguments must have a statically known size
+   = help: unsized fn params are gated as an unstable feature
+
+error[E0277]: the size for values of type `dyn Foo` cannot be known at compilation time
+  --> $DIR/issue-111932.rs:5:26
+   |
+LL |         println!("{:?}", foo);
+   |                   ----   ^^^ doesn't have a size known at compile-time
+   |                   |
+   |                   required by a bound introduced by this call
+   |
+   = help: the trait `Sized` is not implemented for `dyn Foo`
+note: required by a bound in `core::fmt::rt::Argument::<'a>::new_debug`
+  --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
+   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.

tests/ui/unsized-locals/issue-67981.stderr

@@ -5,10 +5,7 @@ LL |     let f: fn([u8]) = |_| {};
    |                        ^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[u8]`
-help: function arguments must have a statically known size, borrowed types always have a known size
-   |
-LL |     let f: fn([u8]) = |&_| {};
-   |                        +
+   = note: all function arguments must have a statically known size
 
 error: aborting due to previous error