incr.comp.: Use red/green tracking for CGU re-use.
diff --git a/src/test/incremental/issue-38222.rs b/src/test/incremental/issue-38222.rs
index d14b1cf..410ff69 100644
--- a/src/test/incremental/issue-38222.rs
+++ b/src/test/incremental/issue-38222.rs
@@ -12,6 +12,8 @@
 // dep-node.
 
 // revisions:rpass1 rpass2
+// compile-flags: -Z query-dep-graph
+
 
 #![feature(rustc_attrs)]