fix types in to_owned doctest
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@ -52,11 +52,11 @@ pub trait ToOwned {
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/// Basic usage:
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///
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/// ```
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/// let s = "a"; // &str
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/// let ss = s.to_owned(); // String
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/// let s: &str = "a";
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/// let ss: String = s.to_owned();
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///
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/// let v = &[1, 2]; // slice
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/// let vv = v.to_owned(); // Vec
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/// let v: &[i32] = &[1, 2];
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/// let vv: Vec<i32> = v.to_owned();
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn to_owned(&self) -> Self::Owned;
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