Replace ahash with foldhash

Cargo.toml

@@ -46,10 +46,10 @@ include = [
 ]
 
 [dependencies]
-ahash = { version = "0.8.11", default-features = false }
 anyhow = "1.0.89"
-clap = { version = "4.5.18", features = ["derive"] }
+clap = { version = "4.5.20", features = ["derive"] }
 crossterm = { version = "0.28.1", default-features = false, features = ["windows", "events"] }
+foldhash = "0.1.3"
 notify = { version = "6.1.1", default-features = false, features = ["macos_fsevent"] }
 os_pipe = "1.2.1"
 rustlings-macros = { path = "rustlings-macros", version = "=6.3.0" }
@@ -61,7 +61,7 @@ toml_edit.workspace = true
 rustix = { version = "0.38.37", default-features = false, features = ["std", "stdio", "termios"] }
 
 [dev-dependencies]
-tempfile = "3.12.0"
+tempfile = "3.13.0"
 
 [profile.release]
 panic = "abort"

clippy.toml

@@ -5,7 +5,7 @@ disallowed-types = [
 ]
 
 disallowed-methods = [
-  # We use `ahash` instead of the default hasher.
+  # We use `foldhash` instead of the default hasher.
   "std::collections::HashSet::new",
   "std::collections::HashSet::with_capacity",
   # Inefficient. Use `.queue(…)` instead.

src/collections.rs

@@ -1,10 +1,9 @@
-use ahash::AHasher;
-use std::hash::BuildHasherDefault;
+use foldhash::fast::FixedState;
 
-/// DOS attacks aren't a concern for Rustlings. Therefore, we use `ahash` with fixed seeds.
-pub type HashSet<T> = std::collections::HashSet<T, BuildHasherDefault<AHasher>>;
+/// DOS attacks aren't a concern for Rustlings. Therefore, we use `foldhash` with a fixed state.
+pub type HashSet<T> = std::collections::HashSet<T, FixedState>;
 
 #[inline]
 pub fn hash_set_with_capacity<T>(capacity: usize) -> HashSet<T> {
-    HashSet::with_capacity_and_hasher(capacity, BuildHasherDefault::<AHasher>::default())
+    HashSet::with_capacity_and_hasher(capacity, FixedState::default())
 }