[INFO] cloning repository https://github.com/chad-russell/seam
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/chad-russell/seam" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchad-russell%2Fseam", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchad-russell%2Fseam'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 177abf0e17689ba5a0340ddb7f3346779a74feef
[INFO] testing chad-russell/seam against try#d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchad-russell%2Fseam" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/chad-russell/seam on toolchain d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/chad-russell/seam
[INFO] finished tweaking git repo https://github.com/chad-russell/seam
[INFO] tweaked toml for git repo https://github.com/chad-russell/seam written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/chad-russell/seam already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cranelift-native v0.76.0
[INFO] [stderr]   Downloaded cranelift-frontend v0.76.0
[INFO] [stderr]   Downloaded cranelift-codegen-shared v0.76.0
[INFO] [stderr]   Downloaded cranelift-entity v0.76.0
[INFO] [stderr]   Downloaded cranelift-codegen v0.76.0
[INFO] [stderr]   Downloaded cranelift-bforest v0.76.0
[INFO] [stderr]   Downloaded cranelift v0.76.0
[INFO] [stderr]   Downloaded cranelift-object v0.76.0
[INFO] [stderr]   Downloaded cranelift-jit v0.76.0
[INFO] [stderr]   Downloaded cranelift-module v0.76.0
[INFO] [stderr]   Downloaded cranelift-codegen-meta v0.76.0
[INFO] [stderr]   Downloaded string-interner v0.12.0
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa520778826e1e68ae83b2af0b285ac243ac891d34ea8b56a88f4845db654c56
[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" "aa520778826e1e68ae83b2af0b285ac243ac891d34ea8b56a88f4845db654c56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa520778826e1e68ae83b2af0b285ac243ac891d34ea8b56a88f4845db654c56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa520778826e1e68ae83b2af0b285ac243ac891d34ea8b56a88f4845db654c56", kill_on_drop: false }`
[INFO] [stdout] aa520778826e1e68ae83b2af0b285ac243ac891d34ea8b56a88f4845db654c56
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 83c8fcc5301aa20b42e9a1b9098c4693188a6add04b5834c24eeacf85aa0021a
[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" "83c8fcc5301aa20b42e9a1b9098c4693188a6add04b5834c24eeacf85aa0021a", kill_on_drop: false }`
[INFO] [stderr]    Compiling cranelift-entity v0.76.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.76.0
[INFO] [stderr]    Compiling target-lexicon v0.12.1
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling ahash v0.3.8
[INFO] [stderr]    Compiling hashbrown v0.8.2
[INFO] [stderr]    Compiling libloading v0.7.0
[INFO] [stderr]    Compiling gimli v0.25.0
[INFO] [stderr]    Compiling region v2.2.0
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.76.0
[INFO] [stderr]    Compiling cranelift-bforest v0.76.0
[INFO] [stderr]    Compiling regalloc v0.0.31
[INFO] [stderr]    Compiling object v0.26.0
[INFO] [stderr]    Compiling string-interner v0.12.0
[INFO] [stderr]    Compiling cranelift-codegen v0.76.0
[INFO] [stderr]    Compiling cranelift-module v0.76.0
[INFO] [stderr]    Compiling cranelift-frontend v0.76.0
[INFO] [stderr]    Compiling cranelift-native v0.76.0
[INFO] [stderr]    Compiling cranelift-jit v0.76.0
[INFO] [stderr]    Compiling cranelift-object v0.76.0
[INFO] [stderr]    Compiling cranelift v0.76.0
[INFO] [stderr]    Compiling seam v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:1637:17
[INFO] [stdout]      |
[INFO] [stdout] 1637 |                 self.handle_defers(id);
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:2395:29
[INFO] [stdout]      |
[INFO] [stdout] 2395 | ...                   self.handle_defers(id);
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:2421:29
[INFO] [stdout]      |
[INFO] [stdout] 2421 | ...                   self.handle_defers(id);
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:2470:25
[INFO] [stdout]      |
[INFO] [stdout] 2470 |                         self.handle_defers(id);
[INFO] [stdout]      |                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 50s
[INFO] running `Command { std: "docker" "inspect" "83c8fcc5301aa20b42e9a1b9098c4693188a6add04b5834c24eeacf85aa0021a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83c8fcc5301aa20b42e9a1b9098c4693188a6add04b5834c24eeacf85aa0021a", kill_on_drop: false }`
[INFO] [stdout] 83c8fcc5301aa20b42e9a1b9098c4693188a6add04b5834c24eeacf85aa0021a
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen" "--no-run" "--message-format=json", 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] 46758ec18915769ee556b9b49e0255f16e1b1039419d04182aecb90d10604519
[INFO] running `Command { std: "docker" "start" "-a" "46758ec18915769ee556b9b49e0255f16e1b1039419d04182aecb90d10604519", kill_on_drop: false }`
[INFO] [stderr]    Compiling seam v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:1637:17
[INFO] [stdout]      |
[INFO] [stdout] 1637 |                 self.handle_defers(id);
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:2395:29
[INFO] [stdout]      |
[INFO] [stdout] 2395 | ...                   self.handle_defers(id);
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:2421:29
[INFO] [stdout]      |
[INFO] [stdout] 2421 | ...                   self.handle_defers(id);
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]     --> src/backend.rs:2470:25
[INFO] [stdout]      |
[INFO] [stdout] 2470 |                         self.handle_defers(id);
[INFO] [stdout]      |                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 4.42s
[INFO] running `Command { std: "docker" "inspect" "46758ec18915769ee556b9b49e0255f16e1b1039419d04182aecb90d10604519", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46758ec18915769ee556b9b49e0255f16e1b1039419d04182aecb90d10604519", kill_on_drop: false }`
[INFO] [stdout] 46758ec18915769ee556b9b49e0255f16e1b1039419d04182aecb90d10604519
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] e551cf2b6708a202b98fd481d466fe3c2f7a80eb532e9d3b91a1c91106184398
[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" "e551cf2b6708a202b98fd481d466fe3c2f7a80eb532e9d3b91a1c91106184398", kill_on_drop: false }`
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/backend.rs:1637:17
[INFO] [stderr]      |
[INFO] [stderr] 1637 |                 self.handle_defers(id);
[INFO] [stderr]      |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/backend.rs:2395:29
[INFO] [stderr]      |
[INFO] [stderr] 2395 | ...                   self.handle_defers(id);
[INFO] [stderr]      |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/backend.rs:2421:29
[INFO] [stderr]      |
[INFO] [stderr] 2421 | ...                   self.handle_defers(id);
[INFO] [stderr]      |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]     --> src/backend.rs:2470:25
[INFO] [stderr]      |
[INFO] [stderr] 2470 |                         self.handle_defers(id);
[INFO] [stderr]      |                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `seam` (bin "seam" test) generated 4 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/seam-a0afc150a4230a5c)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e551cf2b6708a202b98fd481d466fe3c2f7a80eb532e9d3b91a1c91106184398", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e551cf2b6708a202b98fd481d466fe3c2f7a80eb532e9d3b91a1c91106184398", kill_on_drop: false }`
[INFO] [stdout] e551cf2b6708a202b98fd481d466fe3c2f7a80eb532e9d3b91a1c91106184398