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error[E0599]: no method named `is_empty` found for type `Foo` in the current scope
--> $DIR/method-suggestion-no-duplication.rs:19:15
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19 | foo(|s| s.is_empty());
| ^^^^^^^^
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= help: items from traits can only be used if the trait is implemented and in scope
= note: the following traits define an item `is_empty`, perhaps you need to implement one of them:
candidate #1: `std::iter::ExactSizeIterator`
candidate #2: `core::slice::SliceExt`
candidate #3: `core::str::StrExt`
error: aborting due to previous error(s)
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