Auto merge of #10719 - blyxyas:fix-items_after_test_mod_imported_modules, r=Alexendoo

Fix `items_after_test_module`: Ignore imported modules

Fixes #10713. It does a little bit of dark magic, but intention is what really counts.
changelog:[`items_after_test_module`]: Ignore imported modules (`mod foo;`) with no body.

clippy_lints/src/items_after_test_module.rs

@@ -64,20 +64,21 @@ fn check_mod(&mut self, cx: &LateContext<'_>, _: &Mod<'_>, _: HirId) {
                 span_lint_and_help(cx, ITEMS_AFTER_TEST_MODULE, test_mod_span.unwrap().with_hi(item.span.hi()), "items were found after the testing module", None, "move the items to before the testing module was defined");
             }};
 
-            if matches!(item.kind, ItemKind::Mod(_)) {
-                for attr in cx.tcx.get_attrs(item.owner_id.to_def_id(), sym::cfg) {
-                    if_chain! {
-                        if attr.has_name(sym::cfg);
+            if let ItemKind::Mod(module) = item.kind && item.span.hi() == module.spans.inner_span.hi() {
+			// Check that it works the same way, the only I way I've found for #10713
+				for attr in cx.tcx.get_attrs(item.owner_id.to_def_id(), sym::cfg) {
+					if_chain! {
+						if attr.has_name(sym::cfg);
                         if let Some(mitems) = attr.meta_item_list();
                         if let [mitem] = &*mitems;
                         if mitem.has_name(sym::test);
                         then {
-                            was_test_mod_visited = true;
+							was_test_mod_visited = true;
                             test_mod_span = Some(item.span);
                         }
                     }
                 }
-            }
+			}
         }
     }
 }

tests/ui/items_after_test_module/auxiliary/tests.rs

@@ -0,0 +1 @@
+fn main() {}

tests/ui/items_after_test_module/block_module.stderr

@@ -1,5 +1,5 @@
 error: items were found after the testing module
-  --> $DIR/items_after_test_module.rs:13:1
+  --> $DIR/block_module.rs:13:1
    |
 LL | / mod tests {
 LL | |     #[test]

tests/ui/items_after_test_module/imported_module.rs

@@ -0,0 +1,20 @@
+//@compile-flags: --test
+#![allow(unused)]
+#![warn(clippy::items_after_test_module)]
+
+// Nothing here should lint, as `tests` is an imported module (that has no body).
+
+fn main() {}
+
+fn should_not_lint() {}
+
+#[path = "auxiliary/tests.rs"]
+#[cfg(test)]
+mod tests; // Should not lint
+
+fn should_not_lint2() {}
+
+const SHOULD_ALSO_NOT_LINT: usize = 1;
+macro_rules! should_not_lint {
+    () => {};
+}