1ad218f3af
As our implementation of MCP411 nears completion and we begin to solicit testing, it's no longer reasonable to expect testers to type or remember `BikeshedIntrinsicFrom`. The name degrades the ease-of-reading of documentation, and the overall experience of using compiler safe transmute. Tentatively, we'll instead adopt `TransmuteFrom`. This name seems to be the one most likely to be stabilized, after discussion on Zulip [1]. We may want to revisit the ordering of `Src` and `Dst` before stabilization, at which point we'd likely consider `TransmuteInto` or `Transmute`. [1] https://rust-lang.zulipchat.com/#narrow/stream/216762-project-safe-transmute/topic/What.20should.20.60BikeshedIntrinsicFrom.60.20be.20named.3F
117 lines
3.4 KiB
Rust
117 lines
3.4 KiB
Rust
//@ check-pass
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#![crate_type = "lib"]
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#![feature(repr128)]
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#![feature(transmutability)]
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#![allow(dead_code, incomplete_features, non_camel_case_types)]
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mod assert {
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use std::mem::{Assume, TransmuteFrom};
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pub fn is_maybe_transmutable<Src, Dst>()
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where
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Dst: TransmuteFrom<Src, {
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Assume {
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alignment: true,
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lifetimes: true,
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safety: true,
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validity: true,
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}
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}>
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{}
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}
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fn should_accept_repr_rust() {
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fn singleton() {
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enum repr_rust { V }
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assert::is_maybe_transmutable::<repr_rust, ()>();
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assert::is_maybe_transmutable::<u128, repr_rust>();
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}
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fn duplex() {
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enum repr_rust { A, B }
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assert::is_maybe_transmutable::<repr_rust, ()>();
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assert::is_maybe_transmutable::<u128, repr_rust>();
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}
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}
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fn should_accept_primitive_reprs()
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{
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fn should_accept_repr_i8() {
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#[repr(i8)] enum repr_i8 { V }
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assert::is_maybe_transmutable::<repr_i8, ()>();
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assert::is_maybe_transmutable::<i8, repr_i8>();
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}
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fn should_accept_repr_u8() {
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#[repr(u8)] enum repr_u8 { V }
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assert::is_maybe_transmutable::<repr_u8, ()>();
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assert::is_maybe_transmutable::<u8, repr_u8>();
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}
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fn should_accept_repr_i16() {
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#[repr(i16)] enum repr_i16 { V }
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assert::is_maybe_transmutable::<repr_i16, ()>();
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assert::is_maybe_transmutable::<i16, repr_i16>();
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}
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fn should_accept_repr_u16() {
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#[repr(u16)] enum repr_u16 { V }
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assert::is_maybe_transmutable::<repr_u16, ()>();
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assert::is_maybe_transmutable::<u16, repr_u16>();
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}
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fn should_accept_repr_i32() {
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#[repr(i32)] enum repr_i32 { V }
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assert::is_maybe_transmutable::<repr_i32, ()>();
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assert::is_maybe_transmutable::<i32, repr_i32>();
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}
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fn should_accept_repr_u32() {
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#[repr(u32)] enum repr_u32 { V }
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assert::is_maybe_transmutable::<repr_u32, ()>();
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assert::is_maybe_transmutable::<u32, repr_u32>();
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}
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fn should_accept_repr_i64() {
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#[repr(i64)] enum repr_i64 { V }
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assert::is_maybe_transmutable::<repr_i64, ()>();
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assert::is_maybe_transmutable::<i64, repr_i64>();
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}
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fn should_accept_repr_u64() {
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#[repr(u64)] enum repr_u64 { V }
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assert::is_maybe_transmutable::<repr_u64, ()>();
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assert::is_maybe_transmutable::<u64, repr_u64>();
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}
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fn should_accept_repr_i128() {
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#[repr(i128)] enum repr_i128 { V }
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assert::is_maybe_transmutable::<repr_i128, ()>();
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assert::is_maybe_transmutable::<i128, repr_i128>();
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}
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fn should_accept_repr_u128() {
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#[repr(u128)] enum repr_u128 { V }
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assert::is_maybe_transmutable::<repr_u128, ()>();
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assert::is_maybe_transmutable::<u128, repr_u128>();
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}
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fn should_accept_repr_isize() {
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#[repr(isize)] enum repr_isize { V }
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assert::is_maybe_transmutable::<repr_isize, ()>();
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assert::is_maybe_transmutable::<isize, repr_isize>();
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}
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fn should_accept_repr_usize() {
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#[repr(usize)] enum repr_usize { V }
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assert::is_maybe_transmutable::<repr_usize, ()>();
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assert::is_maybe_transmutable::<usize, repr_usize>();
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}
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}
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fn should_accept_repr_c() {
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#[repr(C)] enum repr_c { V }
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assert::is_maybe_transmutable::<repr_c, ()>();
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assert::is_maybe_transmutable::<i128, repr_c>();
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}
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