[INFO] cloning repository https://github.com/martinjonsson01/symbolic-differentiator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/martinjonsson01/symbolic-differentiator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartinjonsson01%2Fsymbolic-differentiator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartinjonsson01%2Fsymbolic-differentiator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c562fb454e1657af3e1bb1ee2adc99f9e2a7b94
[INFO] checking martinjonsson01/symbolic-differentiator against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartinjonsson01%2Fsymbolic-differentiator" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/martinjonsson01/symbolic-differentiator
[INFO] finished tweaking git repo https://github.com/martinjonsson01/symbolic-differentiator
[INFO] tweaked toml for git repo https://github.com/martinjonsson01/symbolic-differentiator written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/martinjonsson01/symbolic-differentiator on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/martinjonsson01/symbolic-differentiator 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" "+1.95.0" "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]   |
[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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v1.0.43
[INFO] [stderr]   Downloaded ordered-float v2.10.0
[INFO] [stderr]   Downloaded string-builder v0.2.0
[INFO] [stderr]   Downloaded serde_derive v1.0.144
[INFO] [stderr]   Downloaded tint v1.0.1
[INFO] [stderr]   Downloaded unicode-ident v1.0.3
[INFO] [stderr]   Downloaded serde v1.0.144
[INFO] [stderr]   Downloaded ctor v0.1.23
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.82
[INFO] [stderr]   Downloaded parameterized-macro v1.0.0
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.82
[INFO] [stderr]   Downloaded itoa v1.0.3
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.82
[INFO] [stderr]   Downloaded os_str_bytes v6.3.0
[INFO] [stderr]   Downloaded directories v4.0.1
[INFO] [stderr]   Downloaded dirs-sys v0.3.7
[INFO] [stderr]   Downloaded clap-verbosity-flag v1.0.1
[INFO] [stderr]   Downloaded output_vt100 v0.1.3
[INFO] [stderr]   Downloaded serde v0.8.23
[INFO] [stderr]   Downloaded rust-ini v0.13.0
[INFO] [stderr]   Downloaded thiserror v1.0.32
[INFO] [stderr]   Downloaded clap_derive v3.2.17
[INFO] [stderr]   Downloaded getrandom v0.2.7
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.82
[INFO] [stderr]   Downloaded anyhow v1.0.62
[INFO] [stderr]   Downloaded textwrap v0.15.0
[INFO] [stderr]   Downloaded js-sys v0.3.59
[INFO] [stderr]   Downloaded bumpalo v3.11.0
[INFO] [stderr]   Downloaded hashbrown v0.9.1
[INFO] [stderr]   Downloaded pretty_assertions v1.2.1
[INFO] [stderr]   Downloaded crossbeam-utils v0.8.11
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.82
[INFO] [stderr]   Downloaded nom v5.1.2
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[INFO] [stderr]   Downloaded clap v3.2.17
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[INFO] [stderr]   Downloaded plotters v0.3.3
[INFO] [stderr]   Downloaded serde_json v1.0.85
[INFO] [stderr]   Downloaded config v0.11.0
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[INFO] [stderr]   Downloaded ptree v0.4.0
[INFO] [stderr]   Downloaded crossbeam-epoch v0.9.10
[INFO] [stderr]   Downloaded once_cell v1.13.1
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[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] de3568889d5c0de8d634c5b3ef57ac915ed9a43c56372239f21dd6d9a6b8fe65
[INFO] running `Command { std: "docker" "start" "-a" "de3568889d5c0de8d634c5b3ef57ac915ed9a43c56372239f21dd6d9a6b8fe65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de3568889d5c0de8d634c5b3ef57ac915ed9a43c56372239f21dd6d9a6b8fe65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de3568889d5c0de8d634c5b3ef57ac915ed9a43c56372239f21dd6d9a6b8fe65", kill_on_drop: false }`
[INFO] [stdout] de3568889d5c0de8d634c5b3ef57ac915ed9a43c56372239f21dd6d9a6b8fe65
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff27a91c283876951c5767f5681dd83f7d9230c43efb3de8b0b49bdd7e8f005c
[INFO] running `Command { std: "docker" "start" "-a" "ff27a91c283876951c5767f5681dd83f7d9230c43efb3de8b0b49bdd7e8f005c", 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]   |
[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 proc-macro2 v1.0.43
[INFO] [stderr]    Compiling unicode-ident v1.0.3
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking once_cell v1.13.1
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking itoa v1.0.3
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling crossbeam-utils v0.8.11
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.10
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking linked-hash-map v0.5.6
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking ordered-float v2.10.0
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking dirs-sys v0.3.7
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling anyhow v1.0.62
[INFO] [stderr]     Checking rust-ini v0.13.0
[INFO] [stderr]     Checking petgraph v0.6.0
[INFO] [stderr]     Checking tint v1.0.1
[INFO] [stderr]     Checking directories v4.0.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking os_str_bytes v6.3.0
[INFO] [stderr]     Checking string-builder v0.2.0
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking rayon-core v1.9.3
[INFO] [stderr]     Checking textwrap v0.15.0
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking rayon v1.5.3
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking plotters v0.3.3
[INFO] [stderr]     Checking serde-hjson v0.9.1
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking pretty_assertions v1.2.1
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]    Compiling clap_derive v3.2.17
[INFO] [stderr]    Compiling parameterized-macro v1.0.0
[INFO] [stderr]     Checking clap v3.2.17
[INFO] [stderr]     Checking clap-verbosity-flag v1.0.1
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]     Checking serde-value v0.7.0
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking config v0.11.0
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stderr]     Checking ptree v0.4.0
[INFO] [stderr]     Checking symbolic-differentiator v0.1.0 (/opt/rustwide/workdir/symbolic-differentiator-lib)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> symbolic-differentiator-lib/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(if_let_guard)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `if_let_guard` has been stable since `1.95.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `walk_composite`
[INFO] [stdout]  --> symbolic-differentiator-lib/src/interpreter/syntax/expression_tree.rs:4:28
[INFO] [stdout]   |
[INFO] [stdout] 4 |     walk_binary_operation, walk_composite, walk_unary_operation, SyntaxVisitor,
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `if_let_guard` has been stable since 1.95.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> symbolic-differentiator-lib/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(if_let_guard)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `symbolic-differentiator` (lib) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ff27a91c283876951c5767f5681dd83f7d9230c43efb3de8b0b49bdd7e8f005c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff27a91c283876951c5767f5681dd83f7d9230c43efb3de8b0b49bdd7e8f005c", kill_on_drop: false }`
[INFO] [stdout] ff27a91c283876951c5767f5681dd83f7d9230c43efb3de8b0b49bdd7e8f005c
