Simplifications for slicing-related types #940
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jturner314
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This allows the `s![]` macro to return an owned type, without requiring an explicit `&` when calling slicing methods.
The original reason for `SliceInfo` being `?Sized` and these conversions was to work around the limitations of the slicing methods taking a type involving `Dimension::SliceArg`. Now that the slicing methods take `I: SliceArg<D>` as the parameter type, these conversions are no longer necessary, and `SliceInfo` doesn't need to be `?Sized`.
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I realized that now that we no longer have a slicing API based on the
Dimension::SliceArgassociated type, thes![]macro can return an owned type, the tricky conversions involving pointer casts no longer need to exist, andSliceInfono longer needs to be?Sized.This PR does the following:
SliceArg<D> for &T.Irather than&I.s![]macro return an ownedSliceInforather than a reference.SliceInfoinvolving tricky pointer casts with similar conversions not involving pointer casts.SliceInfobeSizedand remove the#[repr(transparent)]attribute. These changes aren't necessary, but seem like a nice simplification.