save-analysis: Add a relevant test case

Author: Xanewok

src/test/ui/save-analysis/issue-65411.rs

@@ -0,0 +1,15 @@
+// check-pass
+// compile-flags: -Zsave-analysis
+
+trait Trait { type Assoc; }
+trait GenericTrait<T> {}
+struct Wrapper<B> { b: B }
+
+fn func() {
+    // Processing associated path in impl block definition inside a function
+    // body does not ICE
+    impl<B: Trait> GenericTrait<B::Assoc> for Wrapper<B> {}
+}
+
+
+fn main() {}