bors 6a3dce99f6 Auto merge of #85814 - steffahn:fix_linked_list_itermut_debug, r=m-ou-se
Fix unsoundness of Debug implementation for linked_list::IterMut

Fix #85813, new `marker` field follows the example of `linked_list::Iter`.
2021-05-31 15:22:51 +00:00
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