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error: implementation of `FnMut` is not general enough
--> $DIR/higher-ranked-lifetime-error.rs:12:5
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LL | assert_all::<_, &String>(id);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `FnMut` is not general enough
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= note: `for<'a> fn(&'a String) -> &'a String {id}` must implement `FnMut<(&String,)>`
= note: ...but it actually implements `FnMut<(&'0 String,)>`, for some specific lifetime `'0`
error: aborting due to 1 previous error
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