Rollup merge of #81671 - jackh726:atb-tests, r=estebank

Add more associated type tests

Closes #24159
Closes #37808
Closes #39532
Closes #37883

r? ``@estebank``

Author: jackh726

Diff for: src/test/ui/associated-types/issue-24159.rs

@@ -0,0 +1,37 @@
+// check-pass
+
+#![allow(unused)]
+
+trait Bar<T> {
+    fn dummy(&self);
+}
+
+trait Foo {
+    type A;
+    type B: Bar<Self::A>;
+
+    fn get_b(&self) -> &Self::B;
+}
+
+fn test_bar<A, B: Bar<A>>(_: &B) {}
+
+fn test<A, F: Foo<A = A>>(f: &F) {
+    test_bar(f.get_b());
+}
+
+trait Bar1<T> {}
+trait Caz1 {
+    type A;
+    type B: Bar1<Self::A>;
+}
+
+fn test1<T, U>() where T: Caz1, U: Caz1<A = T::A> {}
+
+trait Bar2<T> {}
+trait Caz2 {
+    type A;
+    type B: Bar2<Self::A>;
+}
+fn test2<T: Caz2<A = ()>>() {}
+
+fn main() {}

Diff for: src/test/ui/associated-types/issue-37808.rs

@@ -0,0 +1,19 @@
+// check-pass
+
+trait Parent {
+    type Ty;
+    type Assoc: Child<Self::Ty>;
+}
+
+trait Child<T> {}
+
+struct ChildWrapper<T>(T);
+impl<A, T> Child<A> for ChildWrapper<T> where T: Child<A> {}
+
+struct ParentWrapper<T>(T);
+impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> {
+    type Ty = A;
+    type Assoc = ChildWrapper<T::Assoc>;
+}
+
+fn main() {}

Diff for: src/test/ui/associated-types/issue-37883.rs

@@ -0,0 +1,25 @@
+// check-pass
+
+use std::ops::Mul;
+
+fn main() {}
+
+trait Ring {}
+trait Real: Ring {}
+
+trait Module: Sized + Mul<<Self as Module>::Ring, Output = Self> {
+    type Ring: Ring;
+}
+
+trait EuclideanSpace {
+    type Coordinates: Module<Ring = Self::Real>;
+    type Real: Real;
+}
+
+trait Translation<E: EuclideanSpace> {
+    fn to_vector(&self) -> E::Coordinates;
+
+    fn powf(&self, n: <E::Coordinates as Module>::Ring) -> E::Coordinates {
+        self.to_vector() * n
+    }
+}

Diff for: src/test/ui/associated-types/issue-39532.rs

@@ -0,0 +1,14 @@
+// check-pass
+
+#![allow(unused)]
+
+trait Foo {
+    type Bar;
+    type Baz: Bar<Self::Bar>;
+}
+
+trait Bar<T> {}
+
+fn x<T: Foo<Bar = U>, U>(t: &T) {}
+
+fn main() {}