Fixed error with aliases composed of functions wrapped in functools.partial.

news/aliases_error.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Fixed error with aliases composed of functions wrapped in functools.partial.
+
+**Security:**
+
+* <news item>

xonsh/built_ins.py

@@ -609,7 +609,7 @@ class SubprocSpec:
 
     def _cmd_event_name(self):
         if callable(self.alias):
-            return self.alias.__name__
+            return getattr(self.alias, "__name__", repr(self.alias))
         elif self.binary_loc is None:
             return "<not-found>"
         else: