2018-08-30 07:18:55 -05:00
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// run-pass
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2018-08-31 08:02:01 -05:00
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#![allow(non_camel_case_types)]
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2014-05-05 20:56:44 -05:00
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2012-08-28 17:54:45 -05:00
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trait double {
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2015-03-25 19:06:52 -05:00
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fn double(self: Box<Self>) -> usize;
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2012-08-28 17:54:45 -05:00
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}
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2015-03-25 19:06:52 -05:00
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impl double for usize {
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fn double(self: Box<usize>) -> usize { *self * 2 }
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2012-08-28 17:54:45 -05:00
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}
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2013-02-01 21:43:17 -06:00
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pub fn main() {
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2021-08-24 19:39:40 -05:00
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let x: Box<_> = Box::new(Box::new(3usize) as Box<dyn double>);
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2015-03-03 02:42:26 -06:00
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assert_eq!(x.double(), 6);
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2012-08-28 17:54:45 -05:00
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}
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