rustdoc: Render for<'_> lifetimes in front of where bound

src/test/rustdoc/higher-ranked-trait-bounds.rs

@@ -0,0 +1,41 @@
+#![crate_name = "foo"]
+
+trait A<'x> {}
+
+// @has foo/fn.test1.html
+// @has - '//pre' "pub fn test1<T>() where for<'a> &'a T: Iterator,"
+pub fn test1<T>()
+where
+    for<'a> &'a T: Iterator,
+{
+}
+
+// @has foo/fn.test2.html
+// @has - '//pre' "pub fn test2<T>() where for<'a, 'b> &'a T: A<'b>,"
+pub fn test2<T>()
+where
+    for<'a, 'b> &'a T: A<'b>,
+{
+}
+
+// @has foo/fn.test3.html
+// @has - '//pre' "pub fn test3<F>() where F: for<'a, 'b> Fn(&'a u8, &'b u8),"
+pub fn test3<F>()
+where
+    F: for<'a, 'b> Fn(&'a u8, &'b u8),
+{
+}
+
+// @has foo/struct.Foo.html
+pub struct Foo<'a> {
+    _x: &'a u8,
+}
+
+impl<'a> Foo<'a> {
+    // @has - '//code' "pub fn bar<T>() where T: A<'a>,"
+    pub fn bar<T>()
+    where
+        T: A<'a>,
+    {
+    }
+}