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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
79 lines
3.3 KiB
Plaintext
79 lines
3.3 KiB
Plaintext
error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:20:18
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LL | fn extend_bare<'a>(src: &'a u8) -> &'static u8 {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:28:18
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LL | fn extend_nested<'a>(src: &'a &'a u8) -> &'a &'static u8 {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:36:18
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LL | fn extend_unit<'a>(src: (&'a u8,)) -> (&'static u8,) {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:40:18
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LL | fn extend_pair<'a>(src: (&'a u8, u8)) -> (&'static u8, u8) {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:50:18
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LL | fn extend_struct<'a>(src: Struct<'a>) -> Struct<'static> {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:62:18
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LL | fn extend_single<'a>(src: Single<'a>) -> Single<'static> {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error: lifetime may not live long enough
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--> $DIR/reject_lifetime_extension.rs:72:18
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LL | fn extend_multi<'a>(src: Multi<'a>) -> Multi<'static> {
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| -- lifetime `'a` defined here
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LL | unsafe { transmute(src) }
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| ^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
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error[E0521]: borrowed data escapes outside of function
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--> $DIR/reject_lifetime_extension.rs:80:18
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LL | fn call_extend_hrtb<'a>(src: &'a u8) -> &'static u8 {
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| -- --- `src` is a reference that is only valid in the function body
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| |
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| lifetime `'a` defined here
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LL | unsafe { extend_hrtb(src) }
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| ^^^^^^^^^^^^^^^^
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| `src` escapes the function body here
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| argument requires that `'a` must outlive `'static`
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note: due to current limitations in the borrow checker, this implies a `'static` lifetime
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--> $DIR/reject_lifetime_extension.rs:85:25
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LL | for<'b> &'b u8: TransmuteFrom<&'a u8>,
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| ^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to 8 previous errors
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For more information about this error, try `rustc --explain E0521`.
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