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-rw-r--r--src/test/compile-fail/trait-privacy.rs7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/test/compile-fail/trait-privacy.rs b/src/test/compile-fail/trait-privacy.rs
index a0d0014a064..5f9e8ba6c0a 100644
--- a/src/test/compile-fail/trait-privacy.rs
+++ b/src/test/compile-fail/trait-privacy.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(rustc_attrs)]
+#![feature(rustc_attrs, get_type_id)]
 #![allow(dead_code)]
 
 mod foo {
@@ -26,5 +26,10 @@ fn g() {
     ().f(); // Check that this does not trigger a privacy error
 }
 
+fn f() {
+    let error = ::std::thread::spawn(|| {}).join().unwrap_err();
+    error.get_type_id(); // Regression test for #21670
+}
+
 #[rustc_error]
 fn main() {} //~ ERROR compilation successful