1 files changed, 38 insertions, 0 deletions
diff --git a/tests/incremental/foreign.rs b/tests/incremental/foreign.rs
new file mode 100644
index 000000000..f46f92eb5
--- /dev/null
+++ b/tests/incremental/foreign.rs
@@ -0,0 +1,38 @@
+// Test what happens we save incremental compilation state that makes
+// use of foreign items. This used to ICE (#34991).
+// ignore-sgx no libc
+
+// revisions: rpass1
+
+#![feature(rustc_private)]
+
+extern crate libc;
+
+use std::ffi::CString;
+
+mod mlibc {
+    use libc::{c_char, c_long, c_longlong};
+
+    extern "C" {
+        pub fn atol(x: *const c_char) -> c_long;
+        pub fn atoll(x: *const c_char) -> c_longlong;
+    }
+}
+
+fn atol(s: String) -> isize {
+    let c = CString::new(s).unwrap();
+    unsafe { mlibc::atol(c.as_ptr()) as isize }
+}
+
+fn atoll(s: String) -> i64 {
+    let c = CString::new(s).unwrap();
+    unsafe { mlibc::atoll(c.as_ptr()) as i64 }
+}
+
+pub fn main() {
+    assert_eq!(atol("1024".to_string()) * 10, atol("10240".to_string()));
+    assert_eq!(
+        (atoll("11111111111111111".to_string()) * 10),
+        atoll("111111111111111110".to_string())
+    );
+}