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Remove an unused &[Ty] <-> &[GenericArg] #110599

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Apr 20, 2023
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Remove an unused &[Ty] <-> &[GenericArg] #110599

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13 changes: 0 additions & 13 deletions compiler/rustc_middle/src/ty/subst.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,6 @@ use std::marker::PhantomData;
use std::mem;
use std::num::NonZeroUsize;
use std::ops::{ControlFlow, Deref};
use std::slice;

/// An entity in the Rust type system, which can be one of
/// several kinds (types, lifetimes, and consts).
Expand Down Expand Up @@ -55,18 +54,6 @@ pub enum GenericArgKind<'tcx> {
Const(ty::Const<'tcx>),
}

/// This function goes from `&'a [Ty<'tcx>]` to `&'a [GenericArg<'tcx>]`
///
/// This is sound as, for types, `GenericArg` is just
/// `NonZeroUsize::new_unchecked(ty as *const _ as usize)` as
/// long as we use `0` for the `TYPE_TAG`.
pub fn ty_slice_as_generic_args<'a, 'tcx>(ts: &'a [Ty<'tcx>]) -> &'a [GenericArg<'tcx>] {
assert_eq!(TYPE_TAG, 0);
// SAFETY: the whole slice is valid and immutable.
// `Ty` and `GenericArg` is explained above.
unsafe { slice::from_raw_parts(ts.as_ptr().cast(), ts.len()) }
}

impl<'tcx> GenericArgKind<'tcx> {
#[inline]
fn pack(self) -> GenericArg<'tcx> {
Expand Down