Limit the maximum number of exercises to 999

src/dev/check.rs

@@ -17,6 +17,7 @@ use crate::{
     CURRENT_FORMAT_VERSION,
 };
 
+const MAX_N_EXERCISES: usize = 999;
 const MAX_EXERCISE_NAME_LEN: usize = 32;
 
 // Find a char that isn't allowed in the exercise's `name` or `dir`.
@@ -347,6 +348,10 @@ fn check_solutions(
 pub fn check(require_solutions: bool) -> Result<()> {
     let info_file = InfoFile::parse()?;
 
+    if info_file.exercises.len() > MAX_N_EXERCISES {
+        bail!("The maximum number of exercises is {MAX_N_EXERCISES}");
+    }
+
     if cfg!(debug_assertions) {
         // A hack to make `cargo run -- dev check` work when developing Rustlings.
         check_cargo_toml(&info_file.exercises, "dev/Cargo.toml", b"../")?;

src/term.rs

@@ -166,7 +166,7 @@ pub fn progress_bar<'a>(
     total: u16,
     term_width: u16,
 ) -> io::Result<()> {
-    debug_assert!(total < 1000);
+    debug_assert!(total <= 999);
     debug_assert!(progress <= total);
 
     const PREFIX: &[u8] = b"Progress: [";