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+- **Changed:**
+  Tactic :g:`intro z` on an existential variable goal forces the resolution
+  of the existential variable into a goal :g:`forall z:?T, ?P`, which
+  becomes :g:`?P` in context :g:`z:?T` after introduction. The
+  existential variable :n:`?P` itself is now defined in a context
+  where the variable of type `?T` is also named :g:`z`, as specified
+  by :tacn:`intro` instead of :g:`x` as it was conventionally the case
+  before
+  (`#18395 <https://github.com/coq/coq/pull/18395>`_,
+  by Hugo Herbelin).