Changed the evaluated type of an exception group from ExceptionGroup to BaseExceptionGroup. This addresses microsoft/pylance-release#4183.

msfterictraut · msfterictraut · commit 44199eeb9eb7 · 2023-04-02T07:21:30.000-07:00
diff --git a/packages/pyright-internal/src/analyzer/typeEvaluator.ts b/packages/pyright-internal/src/analyzer/typeEvaluator.ts
@@ -18667,9 +18667,9 @@ export function createTypeEvaluator(importLookup: ImportLookup, evaluatorOptions
             return getExceptionType(subType, node.typeExpression!);
         });
 
-        // If this is an except group, wrap the exception type in an ExceptionGroup.
+        // If this is an except group, wrap the exception type in an BaseExceptionGroup.
         if (node.isExceptGroup) {
-            targetType = getBuiltInObject(node, 'ExceptionGroup', [targetType]);
+            targetType = getBuiltInObject(node, 'BaseExceptionGroup', [targetType]);
         }
 
         if (node.name) {
diff --git a/packages/pyright-internal/src/tests/samples/tryExcept7.py b/packages/pyright-internal/src/tests/samples/tryExcept7.py
@@ -9,7 +9,7 @@ def func1():
 
     # This should generate an error if using Python 3.10 or earlier.
     except* ValueError as e:
-        reveal_type(e, expected_text="ExceptionGroup[ValueError]")
+        reveal_type(e, expected_text="BaseExceptionGroup[ValueError]")
         pass
 
     # This should generate an error if using Python 3.10 or earlier.
