destructure rather than repeatedly accessing

Author: acmorrow

SCons/SConf.py

@@ -251,9 +251,9 @@ def display_cached_string(self, bi) -> None:
     def failed(self):
         # check, if the reason was a ConfigureDryRunError or a
         # ConfigureCacheError and if yes, reraise the exception
-        exc_type = self.exc_info()[0]
+        exc_type, exc, _ = self.exc_info()
         if issubclass(exc_type, SConfError):
-            raise self.exc_info()[1]
+            raise exc
         elif issubclass(exc_type, SCons.Errors.BuildError):
             # we ignore Build Errors (occurs, when a test doesn't pass)
             # Clear the exception to prevent the contained traceback