[INFO] cloning repository https://github.com/Systemcluster/bracket2-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Systemcluster/bracket2-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSystemcluster%2Fbracket2-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSystemcluster%2Fbracket2-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 52538166672b9b31fda33a3ad0abd3fc1cac9a62
[INFO] testing Systemcluster/bracket2-rs against 1.69.0 for beta-1.70-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSystemcluster%2Fbracket2-rs" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Systemcluster/bracket2-rs on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6-tc1/source/.cargo/config
[INFO] started tweaking git repo https://github.com/Systemcluster/bracket2-rs
[INFO] finished tweaking git repo https://github.com/Systemcluster/bracket2-rs
[INFO] tweaked toml for git repo https://github.com/Systemcluster/bracket2-rs written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Systemcluster/bracket2-rs 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" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded regex v0.2.5
[INFO] [stderr]   Downloaded libc v0.2.34
[INFO] [stderr]   Downloaded redox_syscall v0.1.33
[INFO] [stderr]   Downloaded simplelog v0.4.4
[INFO] [stderr]   Downloaded winapi v0.3.3
[INFO] [stderr]   Downloaded winapi-x86_64-pc-windows-gnu v0.3.2
[INFO] [stderr]   Downloaded winapi-i686-pc-windows-gnu v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a141d3f29154711586f036855e158d1805e307cf59a52562202ac8d000ddc54b
[INFO] running `Command { std: "docker" "start" "-a" "a141d3f29154711586f036855e158d1805e307cf59a52562202ac8d000ddc54b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a141d3f29154711586f036855e158d1805e307cf59a52562202ac8d000ddc54b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a141d3f29154711586f036855e158d1805e307cf59a52562202ac8d000ddc54b", kill_on_drop: false }`
[INFO] [stdout] a141d3f29154711586f036855e158d1805e307cf59a52562202ac8d000ddc54b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f8bdcbdb24e4c6c9d17d3f49b2bc79466657eb8ba4a00d3d465d6db58dfb2559
[INFO] running `Command { std: "docker" "start" "-a" "f8bdcbdb24e4c6c9d17d3f49b2bc79466657eb8ba4a00d3d465d6db58dfb2559", 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.34
[INFO] [stderr]    Compiling cfg-if v0.1.2
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling term v0.4.6
[INFO] [stderr]    Compiling regex-syntax v0.4.2
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[INFO] [stderr]    Compiling unicode-segmentation v1.2.0
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling thread_local v0.3.5
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling simplelog v0.4.4
[INFO] [stderr]    Compiling regex v0.2.5
[INFO] [stderr]    Compiling bracket2 v0.0.1-dev (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/main.rs:7:34
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed due to unsolved ergonomic questions and added lifetime resolution complexity
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/main.rs:11:47
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: removed in favor of `pub(crate)`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/main.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(const_fn)] // const functions
[INFO] [stdout]    |            ^^^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/main.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(const_generics)] // const generics
[INFO] [stdout]    |            ^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: removed in favor of `#![feature(adt_const_params)]` and `#![feature(generic_const_exprs)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(inclusive_range_syntax)] // range syntax additions
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `inclusive_range_syntax` has been stable since `1.26.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `cfg_target_feature` has been stable since `1.27.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `cfg_target_feature` has been stable since `1.27.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `match_beginning_vert` has been stable since `1.25.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `match_beginning_vert` has been stable since `1.25.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `nll` has been stable since `1.63.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `nll` has been stable since `1.63.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `dyn_trait` has been stable since `1.27.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `dyn_trait` has been stable since `1.27.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `dyn_trait` has been stable since `1.27.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `clone_closures` has been stable since `1.26.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `clone_closures` has been stable since `1.26.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `termination_trait` has been stable since `1.26.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `non_modrs_mods` has been stable since `1.30.0` and no longer requires an attribute to enable
[INFO] [stdout]    = help: the feature `non_modrs_mods` has been stable since `1.30.0` and no longer requires an attribute to enable
[INFO] [stdout]    = help: the feature `non_modrs_mods` has been stable since `1.30.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(decl_macro, proc_macro)] // macro improvements
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `proc_macro` has been stable since `1.29.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![feature(arbitrary_self_types)] // additional self method arguments
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(generators, generator_trait)] // generators/coroutines
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(fn_traits, unboxed_closures)] // function-like type traits
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(never_type)] // new types
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(const_fn)] // const functions
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(const_generics)] // const generics
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]    --> src/program.rs:140:3
[INFO] [stdout]     |
[INFO] [stdout] 140 | /         lazy_static!{
[INFO] [stdout] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stdout] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stdout] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stdout] 144 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `__lazy_static_create` which comes from the expansion of the macro `lazy_static` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]    --> src/program.rs:140:3
[INFO] [stdout]     |
[INFO] [stdout] 140 | /         lazy_static!{
[INFO] [stdout] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stdout] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stdout] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stdout] 144 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `__lazy_static_create` which comes from the expansion of the macro `lazy_static` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]    --> src/program.rs:140:3
[INFO] [stdout]     |
[INFO] [stdout] 140 | /         lazy_static!{
[INFO] [stdout] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stdout] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stdout] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stdout] 144 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `__lazy_static_create` which comes from the expansion of the macro `lazy_static` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(inclusive_range_syntax)] // range syntax additions
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `target_feature` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `cfg_target_feature` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:5:28
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `match_default_bindings` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `match_beginning_vert` has been stable since 1.25.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:6:36
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stdout]   |                                    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `underscore_lifetimes` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `nll` has been stable since 1.63.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:7:53
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stdout]   |                                                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `universal_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:8:34
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `dyn_trait` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:8:59
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stdout]   |                                                           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `copy_closures` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `clone_closures` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:9:27
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `termination_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/main.rs:10:23
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `use_nested_groups` has been stable since 1.25.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/main.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `crate_in_paths` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/main.rs:11:31
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `non_modrs_mods` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/main.rs:11:74
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stdout]    |                                                                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/main.rs:12:24
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(decl_macro, proc_macro)] // macro improvements
[INFO] [stdout]    |                        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:7:58
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stdout]   |                                                          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:10:42
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stdout]    |                                          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(generators, generator_trait)] // generators/coroutines
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(fn_traits, unboxed_closures)] // function-like type traits
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `nested_method_call`
[INFO] [stdout]  --> src/main.rs:7:58
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stdout]   |                                                          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `try_trait`
[INFO] [stdout]   --> src/main.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `catch_expr`
[INFO] [stdout]   --> src/main.rs:10:42
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stdout]    |                                          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 27 previous errors; 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bracket2` due to 28 previous errors; 20 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "f8bdcbdb24e4c6c9d17d3f49b2bc79466657eb8ba4a00d3d465d6db58dfb2559", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8bdcbdb24e4c6c9d17d3f49b2bc79466657eb8ba4a00d3d465d6db58dfb2559", kill_on_drop: false }`
[INFO] [stdout] f8bdcbdb24e4c6c9d17d3f49b2bc79466657eb8ba4a00d3d465d6db58dfb2559
