[INFO] fetching crate mech-server 0.0.4...
[INFO] checking mech-server-0.0.4 against master#c2f2db79ca3024f68d22b45aa22b570775c2c4ad for pr-124157
[INFO] extracting crate mech-server 0.0.4 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate mech-server 0.0.4 on toolchain c2f2db79ca3024f68d22b45aa22b570775c2c4ad
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mech-server 0.0.4
[INFO] finished tweaking crates.io crate mech-server 0.0.4
[INFO] tweaked toml for crates.io crate mech-server 0.0.4 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 238 packages to latest compatible versions
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[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
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[INFO] [stderr]   Downloaded mech-program v0.0.4
[INFO] [stderr]   Downloaded mech-syntax v0.0.4
[INFO] [stderr]   Downloaded hashbrown v0.7.2
[INFO] [stderr]   Downloaded mech-core v0.0.4
[INFO] [stderr]   Downloaded mech-utilities v0.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d43d420d05b61f1061568300f4562e5dbbca375892906318f9c176b3185f7cf6
[INFO] running `Command { std: "docker" "start" "-a" "d43d420d05b61f1061568300f4562e5dbbca375892906318f9c176b3185f7cf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d43d420d05b61f1061568300f4562e5dbbca375892906318f9c176b3185f7cf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d43d420d05b61f1061568300f4562e5dbbca375892906318f9c176b3185f7cf6", kill_on_drop: false }`
[INFO] [stdout] d43d420d05b61f1061568300f4562e5dbbca375892906318f9c176b3185f7cf6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b3a12d4476975144e480ef92325b62e9a5e67afff0eaac6a74a366cbe315d45f
[INFO] running `Command { std: "docker" "start" "-a" "b3a12d4476975144e480ef92325b62e9a5e67afff0eaac6a74a366cbe315d45f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
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[INFO] [stderr]     Checking iovec v0.1.4
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[INFO] [stderr]     Checking time v0.1.45
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[INFO] [stderr]     Checking serde v1.0.200
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[INFO] [stderr]    Compiling backtrace v0.3.71
[INFO] [stderr]    Compiling hashbrown v0.7.2
[INFO] [stderr]     Checking gimli v0.28.1
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]    Compiling rand_isaac v0.1.1
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[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_os v0.1.3
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[INFO] [stderr]     Checking tokio-buf v0.1.1
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[INFO] [stderr]    Compiling openssl-macros v0.1.1
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[INFO] [stderr]     Checking term v0.4.6
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[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking addr2line v0.21.0
[INFO] [stderr]     Checking ws v0.9.2
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[INFO] [stderr]     Checking serde_json v1.0.116
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[INFO] [stderr]     Checking mech-syntax v0.0.4
[INFO] [stderr]     Checking mech-utilities v0.0.4
[INFO] [stdout] error[E0635]: unknown feature `drain_filter`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mech-syntax-0.0.4/src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `drain_filter` found for struct `Vec<(std::string::String, hashbrown::HashSet<u64>, hashbrown::HashSet<u64>, Vec<Constraint>)>` in the current scope
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mech-syntax-0.0.4/src/compiler.rs:580:59
[INFO] [stdout]     |
[INFO] [stdout] 580 |           let mut now_satisfied = unsatisfied_constraints.drain_filter(|unsatisfied_constraint| {
[INFO] [stdout]     |                                   ------------------------^^^^^^^^^^^^ method not found in `Vec<(String, HashSet<u64>, HashSet<u64>, Vec<Constraint>)>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `drain_filter` found for struct `Vec<(std::string::String, hashbrown::HashSet<u64>, hashbrown::HashSet<u64>, Vec<Constraint>)>` in the current scope
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mech-syntax-0.0.4/src/compiler.rs:594:57
[INFO] [stdout]     |
[INFO] [stdout] 594 |         let mut now_satisfied = unsatisfied_constraints.drain_filter(|unsatisfied_constraint| {
[INFO] [stdout]     |                                 ------------------------^^^^^^^^^^^^ method not found in `Vec<(String, HashSet<u64>, HashSet<u64>, Vec<Constraint>)>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mech-syntax` (lib) due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "b3a12d4476975144e480ef92325b62e9a5e67afff0eaac6a74a366cbe315d45f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3a12d4476975144e480ef92325b62e9a5e67afff0eaac6a74a366cbe315d45f", kill_on_drop: false }`
[INFO] [stdout] b3a12d4476975144e480ef92325b62e9a5e67afff0eaac6a74a366cbe315d45f
