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error[E0277]: the size for values of type `str` cannot be known at compilation time
--> $DIR/issue-38954.rs:1:10
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LL | fn _test(ref _p: str) {}
| ^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `str`
= help: unsized fn params are gated as an unstable feature
help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn _test(ref _p: &str) {}
| +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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