[INFO] fetching crate mech-server 0.0.4...
[INFO] checking mech-server-0.0.4 against master#5518eaa946291f00471af8b254b2a1715f234882 for pr-120393
[INFO] extracting crate mech-server 0.0.4 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate mech-server 0.0.4 on toolchain 5518eaa946291f00471af8b254b2a1715f234882
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "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-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mount v0.4.0
[INFO] [stderr]   Downloaded hashbrown v0.7.2
[INFO] [stderr]   Downloaded sequence_trie v0.3.6
[INFO] [stderr]   Downloaded staticfile v0.5.0
[INFO] [stderr]   Downloaded bincode v0.8.0
[INFO] [stderr]   Downloaded ws v0.9.2
[INFO] [stderr]   Downloaded mech-utilities v0.0.4
[INFO] [stderr]   Downloaded mech-syntax v0.0.4
[INFO] [stderr]   Downloaded mech-program v0.0.4
[INFO] [stderr]   Downloaded mech-core v0.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a0395e6b85ceeb3f744f99360b1eaa201bd62e10390036ce7057079cfa3ca828
[INFO] running `Command { std: "docker" "start" "-a" "a0395e6b85ceeb3f744f99360b1eaa201bd62e10390036ce7057079cfa3ca828", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0395e6b85ceeb3f744f99360b1eaa201bd62e10390036ce7057079cfa3ca828", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0395e6b85ceeb3f744f99360b1eaa201bd62e10390036ce7057079cfa3ca828", kill_on_drop: false }`
[INFO] [stdout] a0395e6b85ceeb3f744f99360b1eaa201bd62e10390036ce7057079cfa3ca828
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ceb632f4be690b176454b28fd8234223b41ce5fa7a8af665772213f5e0b116e
[INFO] running `Command { std: "docker" "start" "-a" "6ceb632f4be690b176454b28fd8234223b41ce5fa7a8af665772213f5e0b116e", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]    Compiling rand_core v0.4.2
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[INFO] [stderr]     Checking unicode-normalization v0.1.22
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking unicode-bidi v0.3.15
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking matches v0.1.10
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]    Compiling parking_lot_core v0.6.3
[INFO] [stderr]     Checking net2 v0.2.39
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[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]    Compiling siphasher v0.2.3
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[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling rand_os v0.1.3
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[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking tokio-io v0.1.13
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[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]     Checking miniz_oxide v0.7.1
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[INFO] [stderr]     Checking crossbeam-deque v0.7.4
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking idna v0.5.0
[INFO] [stderr]    Compiling backtrace v0.3.69
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling hashbrown v0.7.2
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking url v2.5.0
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]    Compiling mime_guess v1.8.8
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking object v0.32.2
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking tokio-buf v0.1.1
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]    Compiling hyper v0.12.36
[INFO] [stderr]     Checking ahash v0.3.8
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]     Checking openssl v0.10.63
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[INFO] [stderr]     Checking tokio v0.1.22
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[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling mime_guess v2.0.4
[INFO] [stderr]     Checking typemap v0.3.3
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]    Compiling nom v5.1.3
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]     Checking serde_json v1.0.113
[INFO] [stderr]     Checking publicsuffix v1.5.6
[INFO] [stderr]     Checking lexical-core v0.7.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking plugin v0.2.6
[INFO] [stderr]     Checking mech-core v0.0.4
[INFO] [stderr]     Checking cookie v0.12.0
[INFO] [stderr]     Checking try_from v0.3.2
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]     Checking modifier v0.1.0
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking serde_urlencoded v0.5.5
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking iron v0.6.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking sequence_trie v0.3.6
[INFO] [stderr]     Checking lazycell v1.3.0
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking native-tls v0.2.11
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking mount v0.4.0
[INFO] [stderr]     Checking bincode v0.8.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]     Checking mech-utilities v0.0.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking term v0.4.6
[INFO] [stderr]     Checking same-file v0.1.3
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking staticfile v0.5.0
[INFO] [stderr]     Checking term-painter v0.2.4
[INFO] [stderr]     Checking walkdir v1.0.7
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking reqwest v0.9.24
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking ws v0.9.2
[INFO] [stderr]     Checking mech-syntax 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] [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" "6ceb632f4be690b176454b28fd8234223b41ce5fa7a8af665772213f5e0b116e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ceb632f4be690b176454b28fd8234223b41ce5fa7a8af665772213f5e0b116e", kill_on_drop: false }`
[INFO] [stdout] 6ceb632f4be690b176454b28fd8234223b41ce5fa7a8af665772213f5e0b116e
[INFO] checking mech-server-0.0.4 against try#7622c0f807a4e13c4db886a1681bf343795692df+rustflags=-Dnon_local_definitions for pr-120393
[INFO] extracting crate mech-server 0.0.4 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate mech-server 0.0.4 on toolchain 7622c0f807a4e13c4db886a1681bf343795692df
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7622c0f807a4e13c4db886a1681bf343795692df" "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-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7622c0f807a4e13c4db886a1681bf343795692df" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7622c0f807a4e13c4db886a1681bf343795692df" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+7622c0f807a4e13c4db886a1681bf343795692df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 316cedc3d9efe4c5b698c040c576a05ca60d59092324311d7202356121c1197a
[INFO] running `Command { std: "docker" "start" "-a" "316cedc3d9efe4c5b698c040c576a05ca60d59092324311d7202356121c1197a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "316cedc3d9efe4c5b698c040c576a05ca60d59092324311d7202356121c1197a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "316cedc3d9efe4c5b698c040c576a05ca60d59092324311d7202356121c1197a", kill_on_drop: false }`
[INFO] [stdout] 316cedc3d9efe4c5b698c040c576a05ca60d59092324311d7202356121c1197a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dnon_local_definitions" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+7622c0f807a4e13c4db886a1681bf343795692df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a20a24f660da94227adc374cf1da319e42e820e2fb5ac00cc9a8e335e5f4790
[INFO] running `Command { std: "docker" "start" "-a" "2a20a24f660da94227adc374cf1da319e42e820e2fb5ac00cc9a8e335e5f4790", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking unicode-normalization v0.1.22
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking unicode-bidi v0.3.15
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking matches v0.1.10
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]    Compiling parking_lot_core v0.6.3
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking net2 v0.2.39
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[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] [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" "2a20a24f660da94227adc374cf1da319e42e820e2fb5ac00cc9a8e335e5f4790", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a20a24f660da94227adc374cf1da319e42e820e2fb5ac00cc9a8e335e5f4790", kill_on_drop: false }`
[INFO] [stdout] 2a20a24f660da94227adc374cf1da319e42e820e2fb5ac00cc9a8e335e5f4790
