[INFO] fetching crate tbon 0.3.5...
[INFO] building tbon-0.3.5 against try#615edd3ad1cf6871c977dc900317cb6c2070fd6b for pr-97334
[INFO] extracting crate tbon 0.3.5 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate tbon 0.3.5 on toolchain 615edd3ad1cf6871c977dc900317cb6c2070fd6b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+615edd3ad1cf6871c977dc900317cb6c2070fd6b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tbon 0.3.5
[INFO] finished tweaking crates.io crate tbon 0.3.5
[INFO] tweaked toml for crates.io crate tbon 0.3.5 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+615edd3ad1cf6871c977dc900317cb6c2070fd6b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+615edd3ad1cf6871c977dc900317cb6c2070fd6b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+615edd3ad1cf6871c977dc900317cb6c2070fd6b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2227f0d51cc1e99fb9949b6217aeeb24a833bb0c6d7c396c9b4a3389de86df0b
[INFO] running `Command { std: "docker" "start" "-a" "2227f0d51cc1e99fb9949b6217aeeb24a833bb0c6d7c396c9b4a3389de86df0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2227f0d51cc1e99fb9949b6217aeeb24a833bb0c6d7c396c9b4a3389de86df0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2227f0d51cc1e99fb9949b6217aeeb24a833bb0c6d7c396c9b4a3389de86df0b", kill_on_drop: false }`
[INFO] [stdout] 2227f0d51cc1e99fb9949b6217aeeb24a833bb0c6d7c396c9b4a3389de86df0b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+615edd3ad1cf6871c977dc900317cb6c2070fd6b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 417dfd5481e5fee6ef55fb2f4c6a62d0e6e7e23f540664722695ba31e039d871
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "417dfd5481e5fee6ef55fb2f4c6a62d0e6e7e23f540664722695ba31e039d871", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling futures-sink v0.3.21
[INFO] [stderr]    Compiling slab v0.4.6
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling futures-io v0.3.21
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling async-trait v0.1.56
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling pin-project v1.0.10
[INFO] [stderr]    Compiling futures-executor v0.3.21
[INFO] [stderr]    Compiling futures v0.3.21
[INFO] [stderr]    Compiling destream v0.5.0
[INFO] [stderr]    Compiling tbon v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] error: future cannot be sent between threads safely
[INFO] [stdout]    --> src/de.rs:823:96
[INFO] [stdout]     |
[INFO] [stdout] 823 |       async fn decode_option<V: Visitor>(&mut self, visitor: V) -> Result<V::Value, Self::Error> {
[INFO] [stdout]     |  ________________________________________________________________________________________________^
[INFO] [stdout] 824 | |         while self.buffer.is_empty() && !self.source.is_terminated() {
[INFO] [stdout] 825 | |             self.buffer().await?;
[INFO] [stdout] 826 | |         }
[INFO] [stdout] ...   |
[INFO] [stdout] 837 | |         }
[INFO] [stdout] 838 | |     }
[INFO] [stdout]     | |_____^ future created by async block is not `Send`
[INFO] [stdout]     |
[INFO] [stdout]     = help: within `impl futures::Future<Output = Result<<V as Visitor>::Value, de::Error>>`, the trait `std::marker::Send` is not implemented for `<V as Visitor>::Value`
[INFO] [stdout] note: future is not `Send` as this value is used across an await
[INFO] [stdout]    --> src/de.rs:836:37
[INFO] [stdout]     |
[INFO] [stdout] 832 |           if Some(self.buffer[0]) == Type::None.to_u8() {
[INFO] [stdout]     |  _______________________________________________________-
[INFO] [stdout] 833 | |             self.buffer.remove(0);
[INFO] [stdout] 834 | |             visitor.visit_none()
[INFO] [stdout] 835 | |         } else {
[INFO] [stdout]     | |_________- has type `Result<<V as Visitor>::Value, de::Error>` which is not `Send`
[INFO] [stdout] 836 |               visitor.visit_some(self).await
[INFO] [stdout]     |                                       ^^^^^^ await occurs here, with the value maybe used later
[INFO] [stdout] 837 |           }
[INFO] [stdout]     |           - the value is later dropped here
[INFO] [stdout]     = note: required for the cast to the object type `dyn futures::Future<Output = Result<<V as Visitor>::Value, de::Error>> + std::marker::Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tbon` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "417dfd5481e5fee6ef55fb2f4c6a62d0e6e7e23f540664722695ba31e039d871", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "417dfd5481e5fee6ef55fb2f4c6a62d0e6e7e23f540664722695ba31e039d871", kill_on_drop: false }`
[INFO] [stdout] 417dfd5481e5fee6ef55fb2f4c6a62d0e6e7e23f540664722695ba31e039d871