MNT: Warn when name collision between regular setting and selector

bip/utils/config.py

@@ -67,6 +67,8 @@ def nested_lookup(d, key):
 
     if key[0] not in d:
         raise KeyError()
+    if not isinstance(d, dict):
+        return d
 
     d = d[key[0]]
 
@@ -253,7 +255,15 @@ class Config:
                 val = nested_lookup(settings, pat)
             except KeyError:
                 continue
+
+            # If an entry with a selector name as key is
+            # present, and is not a dictionary (e.g.
+            # "subject = 1"), this is probably an error
+            # in the config file, or the selectors the
+            # user has provided. Warn and carry on
             if not isinstance(val, dict):
+                log.warning('Ignoring primitive selector value (%s = %s)',
+                            pat, val)
                 continue
 
             log.debug('Updating settings from selector: %s', pat)