scanner: Explicitly error with constructors but no GObject include

One of the Anaconda developers hit this; the fix was to include
GObject, but without this commit we just traceback'd.

1 files changed, 5 insertions, 1 deletions

diff --git a/giscanner/maintransformer.py b/giscanner/maintransformer.py
index 1b413ed8..2871abac 100644
--- a/giscanner/maintransformer.py
+++ b/giscanner/maintransformer.py
@@ -508,7 +508,11 @@ class MainTransformer(object):
         elif isinstance(parent, ast.Function) and parent.is_constructor:
             if isinstance(target, ast.Class):
                 initially_unowned_type = ast.Type(target_giname='GObject.InitiallyUnowned')
-                initially_unowned = self._transformer.lookup_typenode(initially_unowned_type)
+                try:
+                    initially_unowned = self._transformer.lookup_typenode(initially_unowned_type)
+                except KeyError as e:
+                    message.error_node(node, "constructor found but GObject is not in includes")
+                    return None
                 if initially_unowned and self._is_gi_subclass(typeval, initially_unowned_type):
                     return ast.PARAM_TRANSFER_NONE
                 else: