diff --git a/mesonbuild/mintro.py b/mesonbuild/mintro.py
index ab668d530..c664abdab 100644
--- a/mesonbuild/mintro.py
+++ b/mesonbuild/mintro.py
@@ -492,14 +492,15 @@ updated_introspection_files = []  # type: T.List[str]
 
 def write_intro_info(intro_info: T.Sequence[T.Tuple[str, T.Union[dict, T.List[T.Any]]]], info_dir: str) -> None:
     global updated_introspection_files
-    for i in intro_info:
-        out_file = os.path.join(info_dir, 'intro-{}.json'.format(i[0]))
+    for kind, data in intro_info:
+        print(f'processing {kind}, {data}')
+        out_file = os.path.join(info_dir, f'intro-{kind}.json')
         tmp_file = os.path.join(info_dir, 'tmp_dump.json')
         with open(tmp_file, 'w', encoding='utf-8') as fp:
-            json.dump(i[1], fp)
+            json.dump(data, fp)
             fp.flush() # Not sure if this is needed
         os.replace(tmp_file, out_file)
-        updated_introspection_files += [i[0]]
+        updated_introspection_files += [kind]
 
 def generate_introspection_file(builddata: build.Build, backend: backends.Backend) -> None:
     coredata = builddata.environment.get_coredata()