create separate dep-nodes for predicates_of and explicit_predicates_of

src/test/incremental/issue-51409.rs

@@ -0,0 +1,22 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// revisions: rpass1
+
+// Regression test that `infer_outlives_predicates` can be
+// used with incremental without an ICE.
+
+#![feature(infer_outlives_requirements)]
+
+struct Foo<'a, T> {
+  x: &'a T
+}
+
+fn main() { }