Disable scrape_examples_complex_reverse_dependencies

Author: ehuss

tests/testsuite/doc.rs

@@ -2421,6 +2421,10 @@ fn scrape_examples_avoid_build_script_cycle() {
 }
 
 #[cargo_test(nightly, reason = "rustdoc scrape examples flags are unstable")]
+// FIXME: This test is broken with latest nightly.
+// The example is calling a function from a proc-macro, but proc-macros don't
+// export functions. It is not clear what this test is trying to exercise.
+#[ignore]
 fn scrape_examples_complex_reverse_dependencies() {
     let p = project()
         .file(