[INFO] cloning repository https://github.com/security-union/rust-sync-versus-async
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/security-union/rust-sync-versus-async" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsecurity-union%2Frust-sync-versus-async", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsecurity-union%2Frust-sync-versus-async'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a5614d6c6746623bc2c518e53e6088125942dc6c
[INFO] checking security-union/rust-sync-versus-async against try#dd2d87b6cc31907ae305875eb6be399783dc0256 for pr-143929
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsecurity-union%2Frust-sync-versus-async" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/security-union/rust-sync-versus-async
[INFO] finished tweaking git repo https://github.com/security-union/rust-sync-versus-async
[INFO] tweaked toml for git repo https://github.com/security-union/rust-sync-versus-async written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/security-union/rust-sync-versus-async on toolchain dd2d87b6cc31907ae305875eb6be399783dc0256
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dd2d87b6cc31907ae305875eb6be399783dc0256" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/security-union/rust-sync-versus-async already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dd2d87b6cc31907ae305875eb6be399783dc0256" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e8955075918b6d00525c617f7c34ee2595c70db70b3cf844dc875e4d3604499b" "/opt/rustwide/cargo-home/bin/cargo" "+dd2d87b6cc31907ae305875eb6be399783dc0256" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b58316287a914868a7c403ea4b6533388792ad537cde1576e80798d8bfea51b
[INFO] running `Command { std: "docker" "start" "-a" "3b58316287a914868a7c403ea4b6533388792ad537cde1576e80798d8bfea51b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b58316287a914868a7c403ea4b6533388792ad537cde1576e80798d8bfea51b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b58316287a914868a7c403ea4b6533388792ad537cde1576e80798d8bfea51b", kill_on_drop: false }`
[INFO] [stdout] 3b58316287a914868a7c403ea4b6533388792ad537cde1576e80798d8bfea51b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "RUSTDOCFLAGS=--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:e8955075918b6d00525c617f7c34ee2595c70db70b3cf844dc875e4d3604499b" "/opt/rustwide/cargo-home/bin/cargo" "+dd2d87b6cc31907ae305875eb6be399783dc0256" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7c5e0f90eb43f4658366d939f70155c834a41ebf87ca547ce17e9aff98bd46bb
[INFO] running `Command { std: "docker" "start" "-a" "7c5e0f90eb43f4658366d939f70155c834a41ebf87ca547ce17e9aff98bd46bb", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]    Compiling parking_lot_core v0.9.6
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking bytes v1.3.0
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]    Compiling pkg-config v0.3.26
[INFO] [stderr]     Checking once_cell v1.17.0
[INFO] [stderr]    Compiling cc v1.0.78
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]     Checking itoa v1.0.5
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]     Checking tracing-core v0.1.30
[INFO] [stderr]    Compiling openssl v0.10.45
[INFO] [stderr]    Compiling futures-util v0.3.25
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]    Compiling futures-channel v0.3.25
[INFO] [stderr]    Compiling native-tls v0.2.11
[INFO] [stderr]    Compiling httparse v1.8.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking futures-sink v0.3.25
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.49/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling tokio v1.24.1
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]     Checking http v0.2.8
[INFO] [stderr]     Checking tracing v0.1.37
[INFO] [stderr]     Checking hashbrown v0.12.3
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "7c5e0f90eb43f4658366d939f70155c834a41ebf87ca547ce17e9aff98bd46bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c5e0f90eb43f4658366d939f70155c834a41ebf87ca547ce17e9aff98bd46bb", kill_on_drop: false }`
[INFO] [stdout] 7c5e0f90eb43f4658366d939f70155c834a41ebf87ca547ce17e9aff98bd46bb