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Rollup merge of #49915 - llogiq:doc-shift-types, r=joshtriplett

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[doc] note the special type inference handling for shift ops

This adds a note to the docs about the difference between the shift ops and the corresponding trait methods when it comes to type inference.
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kennytm 2018-04-14 15:23:08 +08:00
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14
src/libcore/ops/bit.rs
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@ -315,7 +315,12 @@ macro_rules! bitxor_impl {
bitxor_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
/// The left shift operator `<<`.
/// The left shift operator `<<`. Note that because this trait is implemented
/// for all integer types with multiple right-hand-side types, Rust's type
/// checker has special handling for `_ << _`, setting the result type for
/// integer operations to the type of the left-hand-side operand. This means
/// that though `a << b` and `a.shl(b)` are one and the same from an evaluation
/// standpoint, they are different when it comes to type inference.
///
/// # Examples
///
@ -417,7 +422,12 @@ macro_rules! shl_impl_all {
shl_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 isize i128 }
/// The right shift operator `>>`.
/// The right shift operator `>>`. Note that because this trait is implemented
/// for all integer types with multiple right-hand-side types, Rust's type
/// checker has special handling for `_ >> _`, setting the result type for
/// integer operations to the type of the left-hand-side operand. This means
/// that though `a >> b` and `a.shr(b)` are one and the same from an evaluation
/// standpoint, they are different when it comes to type inference.
///
/// # Examples
///