1 files changed, 18 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-3559.rs b/tests/ui/issues/issue-3559.rs
new file mode 100644
index 00000000000..9d498584a9d
--- /dev/null
+++ b/tests/ui/issues/issue-3559.rs
@@ -0,0 +1,18 @@
+// run-pass
+use std::collections::HashMap;
+
+fn check_strs(actual: &str, expected: &str) -> bool {
+    if actual != expected {
+        println!("Found {}, but expected {}", actual, expected);
+        return false;
+    }
+    return true;
+}
+
+pub fn main() {
+    let mut table = HashMap::new();
+    table.insert("one".to_string(), 1);
+    table.insert("two".to_string(), 2);
+    assert!(check_strs(&format!("{:?}", table), "{\"one\": 1, \"two\": 2}") ||
+            check_strs(&format!("{:?}", table), "{\"two\": 2, \"one\": 1}"));
+}