Fix samples and improve driver

compiler/tests/driver.rs

@@ -100,11 +100,17 @@ fn test_execution_rs(fic: &str) {
         .current_dir(&work_dir)
         .env(ENV_RUST_BACKTRACE, "1")
         .status()
-        .expect("Failed to spawn and wait for the compiled binary");
+        .unwrap_or_else(|e| {
+            panic!(
+                "Failed to spawn and wait for the compiled binary: {}, output available in: {}",
+                e.to_string(),
+                work_dir.display()
+            )
+        });
 
     assert!(
         execution_status.success(),
-        "Failed to execute {} with exit code: {}, output available in {}",
+        "Failed to execute {} with exit code: {}, output available in: {}",
         fic,
         execution_status.code().unwrap_or(-1),
         work_dir.display()

samples/casting/dyn_star/basic.rs

@@ -12,8 +12,15 @@ impl Bar for Foo {
     }
 }
 
+impl<T: Bar> Bar for Box<T> {
+    fn bar(&self) -> usize {
+        Bar::bar(self.as_ref())
+    }
+}
+
 fn main() {
     let x = Foo(10);
+    let x = Box::new(x);
     let bar = x as dyn* Bar;
     foo(bar);
 }

samples/casting/dyn_star/symbolic_inner.rs

@@ -14,8 +14,15 @@ impl Bar for Foo {
     }
 }
 
+impl<T: Bar> Bar for Box<T> {
+    fn bar(&self) -> usize {
+        Bar::bar(self.as_ref())
+    }
+}
+
 fn main() {
     let x = Foo(10.mark_symbolic());
+    let x = Box::new(x);
     let bar = x as dyn* Bar;
     test(bar);
 }