1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui-fulldeps/internal-lints/default_hash_types.rs b/src/test/ui-fulldeps/internal-lints/default_hash_types.rs
new file mode 100644
index 000000000..795c7d2dc
--- /dev/null
+++ b/src/test/ui-fulldeps/internal-lints/default_hash_types.rs
@@ -0,0 +1,29 @@
+// compile-flags: -Z unstable-options
+
+#![feature(rustc_private)]
+#![deny(rustc::default_hash_types)]
+
+extern crate rustc_data_structures;
+
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use std::collections::{HashMap, HashSet};
+
+mod foo {
+    pub struct HashMap;
+}
+
+fn main() {
+    let _map: HashMap<String, String> = HashMap::default();
+    //~^ ERROR prefer `FxHashMap` over `HashMap`, it has better performance
+    //~^^ ERROR prefer `FxHashMap` over `HashMap`, it has better performance
+    let _set: HashSet<String> = HashSet::default();
+    //~^ ERROR prefer `FxHashSet` over `HashSet`, it has better performance
+    //~^^ ERROR prefer `FxHashSet` over `HashSet`, it has better performance
+
+    // test that the lint doesn't also match the Fx variants themselves
+    let _fx_map: FxHashMap<String, String> = FxHashMap::default();
+    let _fx_set: FxHashSet<String> = FxHashSet::default();
+
+    // test another struct of the same name
+    let _ = foo::HashMap;
+}