1 files changed, 41 insertions, 0 deletions
diff --git a/src/test/ui/traits/object/generics.rs b/src/test/ui/traits/object/generics.rs
new file mode 100644
index 000000000..5a4a6aecc
--- /dev/null
+++ b/src/test/ui/traits/object/generics.rs
@@ -0,0 +1,41 @@
+// run-pass
+// test for #8664
+
+use std::marker;
+
+pub trait Trait2<A> {
+    fn doit(&self) -> A;
+}
+
+pub struct Impl<A1, A2, A3> {
+    m1: marker::PhantomData<(A1,A2,A3)>,
+    /*
+     * With A2 we get the ICE:
+     * task <unnamed> failed at 'index out of bounds: the len is 1 but the index is 1',
+     * src/librustc/middle/subst.rs:58
+     */
+    t: Box<dyn Trait2<A2>+'static>
+}
+
+impl<A1, A2, A3> Impl<A1, A2, A3> {
+    pub fn step(&self) {
+        self.t.doit();
+    }
+}
+
+// test for #8601
+
+enum Type<T> { Constant(#[allow(unused_tuple_struct_fields)] T) }
+
+trait Trait<K,V> {
+    fn method(&self, _: Type<(K,V)>) -> isize;
+}
+
+impl<V> Trait<u8,V> for () {
+    fn method(&self, _x: Type<(u8,V)>) -> isize { 0 }
+}
+
+pub fn main() {
+    let a = Box::new(()) as Box<dyn Trait<u8, u8>>;
+    assert_eq!(a.method(Type::Constant((1, 2))), 0);
+}