[INFO] cloning repository https://github.com/lukad/chao
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lukad/chao" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flukad%2Fchao", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flukad%2Fchao'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6bd86f674e8be759046c5eaf0f611aa82f7f3745
[INFO] testing lukad/chao against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flukad%2Fchao" "/workspace/builds/worker-46/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-46/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lukad/chao on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lukad/chao
[INFO] finished tweaking git repo https://github.com/lukad/chao
[INFO] tweaked toml for git repo https://github.com/lukad/chao written to /workspace/builds/worker-46/source/Cargo.toml
[INFO] crate git repo https://github.com/lukad/chao already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b004b5e9c696c4eeb437f36fc4113f2d3fcdecb43acc5f0cd74ae107b8143dd
[INFO] running `Command { std: "docker" "start" "-a" "2b004b5e9c696c4eeb437f36fc4113f2d3fcdecb43acc5f0cd74ae107b8143dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b004b5e9c696c4eeb437f36fc4113f2d3fcdecb43acc5f0cd74ae107b8143dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b004b5e9c696c4eeb437f36fc4113f2d3fcdecb43acc5f0cd74ae107b8143dd", kill_on_drop: false }`
[INFO] [stdout] 2b004b5e9c696c4eeb437f36fc4113f2d3fcdecb43acc5f0cd74ae107b8143dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b25889aab9359e76d19226ddb9fb17b04801b5c7310abd0ab113955eaaac6150
[INFO] running `Command { std: "docker" "start" "-a" "b25889aab9359e76d19226ddb9fb17b04801b5c7310abd0ab113955eaaac6150", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling cgmath v0.16.1
[INFO] [stderr]    Compiling winapi v0.3.7
[INFO] [stderr]    Compiling approx v0.1.1
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling rgb v0.8.13
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling bitflags v0.4.0
[INFO] [stderr]    Compiling ascii v0.9.1
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling encode_unicode v0.1.3
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling combine v3.8.1
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling nix v0.5.1
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling rustyline v1.0.0
[INFO] [stderr]    Compiling winconsole v0.10.0
[INFO] [stderr]    Compiling colored v1.8.0
[INFO] [stderr]    Compiling libchao v0.1.0 (/opt/rustwide/workdir/libchao)
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> libchao/src/builtin.rs:85:20
[INFO] [stdout]    |
[INFO] [stdout] 85 |             [head, tail..] => tail.iter().fold(head.clone(), |acc, x| acc - x.clone()),
[INFO] [stdout]    |                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> libchao/src/builtin.rs:85:31
[INFO] [stdout]    |
[INFO] [stdout] 85 |             [head, tail..] => tail.iter().fold(head.clone(), |acc, x| acc - x.clone()),
[INFO] [stdout]    |                               ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]    --> libchao/src/builtin.rs:105:20
[INFO] [stdout]     |
[INFO] [stdout] 105 |             [head, tail..] => tail.iter().fold(head.clone(), |acc, x| acc / x.clone()),
[INFO] [stdout]     |                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]    --> libchao/src/builtin.rs:105:31
[INFO] [stdout]     |
[INFO] [stdout] 105 |             [head, tail..] => tail.iter().fold(head.clone(), |acc, x| acc / x.clone()),
[INFO] [stdout]     |                               ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]    --> libchao/src/builtin.rs:134:20
[INFO] [stdout]     |
[INFO] [stdout] 134 |             [head, tail..] => Bool(tail.iter().all(|ref x| *x == head)),
[INFO] [stdout]     |                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]    --> libchao/src/builtin.rs:134:36
[INFO] [stdout]     |
[INFO] [stdout] 134 |             [head, tail..] => Bool(tail.iter().all(|ref x| *x == head)),
[INFO] [stdout]     |                                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `rest` in this scope
[INFO] [stdout]   --> libchao/src/env.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |             [expr, rest..] => match self.eval(expr) {
[INFO] [stdout]    |                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `rest` in this scope
[INFO] [stdout]   --> libchao/src/env.rs:76:33
[INFO] [stdout]    |
[INFO] [stdout] 76 |                     for expr in rest.iter() {
[INFO] [stdout]    |                                 ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `rest` in this scope
[INFO] [stdout]   --> libchao/src/env.rs:86:36
[INFO] [stdout]    |
[INFO] [stdout] 86 |                     self.bind_args(rest.to_vec(), arg_names.clone());
[INFO] [stdout]    |                                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> libchao/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `X..` patterns in slices are experimental
[INFO] [stdout]   --> libchao/src/builtin.rs:85:20
[INFO] [stdout]    |
[INFO] [stdout] 85 |             [head, tail..] => tail.iter().fold(head.clone(), |acc, x| acc - x.clone()),
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `X..` patterns in slices are experimental
[INFO] [stdout]    --> libchao/src/builtin.rs:105:20
[INFO] [stdout]     |
[INFO] [stdout] 105 |             [head, tail..] => tail.iter().fold(head.clone(), |acc, x| acc / x.clone()),
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `X..` patterns in slices are experimental
[INFO] [stdout]    --> libchao/src/builtin.rs:134:20
[INFO] [stdout]     |
[INFO] [stdout] 134 |             [head, tail..] => Bool(tail.iter().all(|ref x| *x == head)),
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `X..` patterns in slices are experimental
[INFO] [stdout]   --> libchao/src/env.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |             [expr, rest..] => match self.eval(expr) {
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> libchao/src/parser.rs:68:29
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let (c, consumed) = try!(any().parse_lazy(input).into());
[INFO] [stdout]    |                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libchao` due to 15 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "b25889aab9359e76d19226ddb9fb17b04801b5c7310abd0ab113955eaaac6150", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b25889aab9359e76d19226ddb9fb17b04801b5c7310abd0ab113955eaaac6150", kill_on_drop: false }`
[INFO] [stdout] b25889aab9359e76d19226ddb9fb17b04801b5c7310abd0ab113955eaaac6150