zvariant fails to compile on latest nightly: size cannot be statically determined

[m-ou-se]

[package]
name = "scratchpad"
version = "0.1.0"

[dependencies]
zvariant = "2.8.0"

fn main() {}

Results in:

error[E0161]: cannot move a value of type owned_value::OwnedValue: the size of owned_value::OwnedValue cannot be statically determined
   --> /home/mara/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/zvariant-2.8.0/src/value.rs:174:21
    |
174 |                 let o = OwnedValue::from(&**v);
    |                     ^

error[E0161]: cannot move a value of type owned_value::OwnedValue: the size of owned_value::OwnedValue cannot be statically determined
   --> /home/mara/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/zvariant-2.8.0/src/value.rs:175:39
    |
175 |                 Value::Value(Box::new(o.into_inner()))
    |                                       ^

error[E0161]: cannot move a value of type owned_value::OwnedValue: the size of owned_value::OwnedValue cannot be statically determined
   --> /home/mara/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/zvariant-2.8.0/src/owned_value.rs:197:9
    |
197 |         v.into_inner()
    |         ^

error[E0161]: cannot move a value of type owned_value::OwnedValue: the size of owned_value::OwnedValue cannot be statically determined
   --> /home/mara/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/zvariant-2.8.0/src/owned_value.rs:214:12
    |
214 |         Ok(Value::deserialize(deserializer)?.into())
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

But worked fine recently.

Version it worked on

rustc 1.57.0-nightly (9dd4ce80f 2021-09-17)
binary: rustc
commit-hash: 9dd4ce80fb01d1ff5cb5002f08b7b3847b59e664
commit-date: 2021-09-17
host: x86_64-unknown-linux-gnu
release: 1.57.0-nightly
LLVM version: 13.0.0

Version with regression

rustc 1.57.0-nightly (aa8f2d432 2021-09-18)
binary: rustc
commit-hash: aa8f2d432b23575929a48f87b8746f41ba723318
commit-date: 2021-09-18
host: x86_64-unknown-linux-gnu
release: 1.57.0-nightly
LLVM version: 13.0.0

[m-ou-se]

Bisecting..

• ❌ rustc 1.57.0-nightly (aa8f2d4 2021-09-18)
• ❌ Reuse existing shared Lrc for MatchImpl parent #89000
• ❌ 👉 Disable the evaluation cache when in intercrate mode #88994 👈
• 🆗 Simplify lazy DefPathHash decoding by using an on-disk hash table. #82183
• 🆗 Skip single use lifetime lint for generated opaque types  #88650
• 🆗 Avoid codegen for Result::into_ok in lang_start #88988
• 🆗 Use explicit log level in tracing instrument macro #88980
• 🆗 Move the Lock into symbol::Interner #88978
• 🆗 Fast reject for NeedsNonConstDrop #88965
• 🆗 inline(always) on check_recursion_limit #88962
• 🆗 rustc 1.57.0-nightly (9dd4ce8 2021-09-17)

[hkmatsumoto]

Assigning priority as discussed in the Zulip thread of the Prioritization Working Group.

@rustbot label -I-prioritize +P-high

[Aaron1011]

I opened #89125 with a fix.

[Kobzol]

@pnkfelix This now has a test (#89412), so the issue can be probably closed.