Changed test for issue 56202 to compile-pass.

src/test/ui/issues/issue-56202.rs

@@ -1,3 +1,5 @@
+// compile-pass
+
 #![feature(self_struct_ctor)]
 
 trait FooTrait {}
@@ -13,3 +15,5 @@ impl BarTrait for FooStruct {
         Self(u32::default())
     }
 }
+
+fn main() {}

src/test/ui/issues/issue-56202.stderr

@@ -1,7 +0,0 @@
-error[E0601]: `main` function not found in crate `issue_56202`
-   |
-   = note: consider adding a `main` function to `$DIR/issue-56202.rs`
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0601`.