feat: Remind the user of the hint option (#425)

Suggestion from AbdouSeck https://github.com/rust-lang/rustlings/issues/424#issuecomment-639870331
for when the student's code has errors.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/verify.rs b/src/verify.rs
index fac0491..807bea9 100644
--- a/src/verify.rs
+++ b/src/verify.rs
@@ -65,6 +65,7 @@ fn compile_and_run_interactively(exercise: &Exercise) -> Result<bool, ()> {
         Err(output) => {
             warn!("Ran {} with errors", exercise);
             println!("{}", output.stdout);
+            println!("{}", output.stderr);
             return Err(());
         }
     };