chore: checkpoint before Python removal

vendor/displaydoc/tests/num_in_field.rs

@@ -0,0 +1,22 @@
+/// {foo1} {foo2}
+#[derive(displaydoc::Display)]
+pub struct Test {
+    foo1: String,
+    foo2: String,
+}
+
+fn assert_display<T: std::fmt::Display>(input: T, expected: &'static str) {
+    let out = format!("{}", input);
+    assert_eq!(expected, out);
+}
+
+#[test]
+fn does_it_print() {
+    assert_display(
+        Test {
+            foo1: "hi".into(),
+            foo2: "hello".into(),
+        },
+        "hi hello",
+    );
+}