Add a test for non-mod.rs mods

Author: flodiebold

src/modules.rs

@@ -75,7 +75,6 @@ fn module_file(
     relative: Option<ast::Ident>,
     codemap: &codemap::CodeMap,
 ) -> Result<(PathBuf, Option<ast::Ident>), io::Error> {
-    eprintln!("module_file {:?} {:?} {:?}", id, attrs, dir_path);
     if let Some(path) = parser::Parser::submod_path_from_attr(attrs, dir_path) {
         return Ok((path, None));
     }

src/test/mod.rs

@@ -232,6 +232,23 @@ fn self_tests() {
     );
 }
 
+#[test]
+fn issue_2673_non_modrs_mods() {
+    match idempotent_check(&PathBuf::from("tests/issue-2673-nonmodrs-mods/lib.rs")) {
+        Ok(ref report) if report.has_warnings() => {
+            print!("{}", report);
+            panic!("had warnings");
+        }
+        Ok(_report) => {}
+        Err(err) => {
+            if let IdempotentCheckError::Mismatch(msg) = err {
+                print_mismatches_default_message(msg);
+            }
+            panic!("had errors");
+        }
+    }
+}
+
 #[test]
 fn stdin_formatting_smoke_test() {
     let input = Input::Text("fn main () {}".to_owned());

tests/issue-2673-nonmodrs-mods/foo.rs

@@ -0,0 +1,3 @@
+mod bar;
+
+mod baz {}

tests/issue-2673-nonmodrs-mods/foo/bar.rs

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

tests/issue-2673-nonmodrs-mods/lib.rs

@@ -0,0 +1,3 @@
+#![feature(non_modrs_mods)]
+
+mod foo;