Remove pattern in trait's method signature
This use of `mut` was nonsensical for now, but is proposed to be disallowed by rustc in the future (as a bugfix in Rust).
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@ -274,7 +274,7 @@ pub trait PrimInt
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///
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/// assert_eq!(2i32.pow(4), 16);
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/// ```
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fn pow(self, mut exp: u32) -> Self;
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fn pow(self, exp: u32) -> Self;
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}
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macro_rules! prim_int_impl {
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