1 files changed, 44 insertions, 0 deletions
diff --git a/src/test/incremental/issue-42602.rs b/src/test/incremental/issue-42602.rs
new file mode 100644
index 000000000..b8d5303fb
--- /dev/null
+++ b/src/test/incremental/issue-42602.rs
@@ -0,0 +1,44 @@
+// Regression test for #42602. It used to be that we had
+// a dep-graph like
+//
+//     typeck(foo) -> FnOnce -> typeck(bar)
+//
+// This was fixed by improving the resolution of the `FnOnce` trait
+// selection node.
+
+// revisions:cfail1 cfail2 cfail3
+// compile-flags:-Zquery-dep-graph
+// build-pass (FIXME(62277): could be check-pass?)
+
+#![feature(rustc_attrs)]
+
+fn main() {
+    a::foo();
+    b::bar();
+}
+
+mod a {
+    #[cfg(cfail1)]
+    pub fn foo() {
+        let x = vec![1, 2, 3];
+        let v = || ::std::mem::drop(x);
+        v();
+    }
+
+    #[cfg(not(cfail1))]
+    pub fn foo() {
+        let x = vec![1, 2, 3, 4];
+        let v = || ::std::mem::drop(x);
+        v();
+    }
+}
+
+mod b {
+    #[rustc_clean(cfg="cfail2")]
+    #[rustc_clean(cfg="cfail3")]
+    pub fn bar() {
+        let x = vec![1, 2, 3];
+        let v = || ::std::mem::drop(x);
+        v();
+    }
+}