print erroneous snippet location

pythonx/UltiSnips/snippet/definition/_base.py

@@ -121,12 +121,14 @@ class SnippetDefinition(object):
             exec(code, {'snip': snip})
         except Exception as e:
             e.snippet_info = textwrap.dedent("""
+                Defined in: {}
                 Trigger: {}
                 Description: {}
                 Context: {}
                 Pre-expand: {}
                 Post-expand: {}
             """).format(
+                self._location,
                 self._trigger,
                 self._description,
                 self._context_code if self._context_code else '<none>',

test/test_ParseSnippets.py

@@ -304,3 +304,13 @@ class ParseSnippets_PrintErroneousSnippetPostAction(_VimTest):
     keys = 'test' + EX
     wanted = keys
     expected_error = "Post-expand: asd"
+
+class ParseSnippets_PrintErroneousSnippetLocation(_VimTest):
+    files = { 'us/all.snippets': r"""
+        post_expand "asd()"
+        snippet test
+        endsnippet
+        """}
+    keys = 'test' + EX
+    wanted = keys
+    expected_error = "Defined in: .*/all.snippets"