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
131 lines
6.7 KiB
Rust
131 lines
6.7 KiB
Rust
//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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#![crate_type = "lib"]
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#![feature(transmutability)]
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#![allow(dead_code)]
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mod assert {
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use std::mem::TransmuteFrom;
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pub fn is_transmutable<Src, Dst>()
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where
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Dst: TransmuteFrom<Src>
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{}
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}
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fn should_accept_identity() {
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assert::is_transmutable::< i8, i8>();
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assert::is_transmutable::< u8, u8>();
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assert::is_transmutable::< i16, i16>();
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assert::is_transmutable::< u16, u16>();
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assert::is_transmutable::< i32, i32>();
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assert::is_transmutable::< f32, f32>();
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assert::is_transmutable::< u32, u32>();
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assert::is_transmutable::< i64, i64>();
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assert::is_transmutable::< f64, f64>();
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assert::is_transmutable::< u64, u64>();
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assert::is_transmutable::< i128, i128>();
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assert::is_transmutable::< u128, u128>();
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assert::is_transmutable::<isize, isize>();
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assert::is_transmutable::<usize, usize>();
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}
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fn should_be_bitransmutable() {
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assert::is_transmutable::< i8, u8>();
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assert::is_transmutable::< u8, i8>();
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assert::is_transmutable::< i16, u16>();
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assert::is_transmutable::< u16, i16>();
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assert::is_transmutable::< i32, f32>();
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assert::is_transmutable::< i32, u32>();
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assert::is_transmutable::< f32, i32>();
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assert::is_transmutable::< f32, u32>();
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assert::is_transmutable::< u32, i32>();
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assert::is_transmutable::< u32, f32>();
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assert::is_transmutable::< u64, i64>();
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assert::is_transmutable::< u64, f64>();
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assert::is_transmutable::< i64, u64>();
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assert::is_transmutable::< i64, f64>();
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assert::is_transmutable::< f64, u64>();
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assert::is_transmutable::< f64, i64>();
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assert::is_transmutable::< u128, i128>();
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assert::is_transmutable::< i128, u128>();
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assert::is_transmutable::<isize, usize>();
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assert::is_transmutable::<usize, isize>();
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}
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fn should_reject_extension() {
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assert::is_transmutable::< i8, i16>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, u16>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, i32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, f32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, u32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i8, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, i16>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, u16>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, i32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, f32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, u32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u8, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, i32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, f32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, u32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i16, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, i32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, f32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, u32>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u16, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i32, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i32, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i32, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i32, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i32, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f32, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f32, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f32, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f32, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f32, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u32, u64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u32, i64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u32, f64>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u32, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u32, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u64, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< u64, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i64, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< i64, i128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f64, u128>(); //~ ERROR cannot be safely transmuted
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assert::is_transmutable::< f64, i128>(); //~ ERROR cannot be safely transmuted
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}
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