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error[E0596]: cannot borrow `*y` as mutable, as it is behind a `&` reference
--> $DIR/overloaded-index-without-indexmut.rs:14:5
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LL | y.push_str("");
| ^ `y` is a `&` reference, so the data it refers to cannot be borrowed as mutable
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0596`.
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