[INFO] updating cached repository https://github.com/Systemcluster/bracket2-rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 52538166672b9b31fda33a3ad0abd3fc1cac9a62
[INFO] checking Systemcluster/bracket2-rs against master#bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc for pr-70917
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSystemcluster%2Fbracket2-rs" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Systemcluster/bracket2-rs on toolchain bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-5/source/Cargo.toml
[INFO] crate git repo https://github.com/Systemcluster/bracket2-rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 53740c1ff5495e175a014a8b14578f94d9a3ced9755475d47286ab08048d55fc
[INFO] running `"docker" "start" "-a" "53740c1ff5495e175a014a8b14578f94d9a3ced9755475d47286ab08048d55fc"`
[INFO] [stderr]     Checking unicode-segmentation v1.2.0
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking time v0.1.39
[INFO] [stderr]     Checking aho-corasick v0.6.4
[INFO] [stderr]     Checking simplelog v0.4.4
[INFO] [stderr]     Checking regex v0.2.5
[INFO] [stderr]     Checking bracket2 v0.0.1-dev (/opt/rustwide/workdir)
[INFO] [stderr] warning: the feature `const_generics` is incomplete and may cause the compiler to crash
[INFO] [stderr]   --> src/main.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![feature(const_generics)] // const generics
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]    --> src/program.rs:140:3
[INFO] [stderr]     |
[INFO] [stderr] 140 |           lazy_static!{
[INFO] [stderr]     |  _________^
[INFO] [stderr] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stderr] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stderr] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stderr] 144 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]    --> src/program.rs:140:3
[INFO] [stderr]     |
[INFO] [stderr] 140 |           lazy_static!{
[INFO] [stderr]     |  _________^
[INFO] [stderr] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stderr] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stderr] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stderr] 144 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]    --> src/program.rs:140:3
[INFO] [stderr]     |
[INFO] [stderr] 140 |           lazy_static!{
[INFO] [stderr]     |  _________^
[INFO] [stderr] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stderr] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stderr] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stderr] 144 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `const_generics` is incomplete and may cause the compiler to crash
[INFO] [stderr]   --> src/main.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![feature(const_generics)] // const generics
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]    --> src/program.rs:140:3
[INFO] [stderr]     |
[INFO] [stderr] 140 |           lazy_static!{
[INFO] [stderr]     |  _________^
[INFO] [stderr] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stderr] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stderr] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stderr] 144 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]    --> src/program.rs:140:3
[INFO] [stderr]     |
[INFO] [stderr] 140 |           lazy_static!{
[INFO] [stderr]     |  _________^
[INFO] [stderr] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stderr] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stderr] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stderr] 144 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]    --> src/program.rs:140:3
[INFO] [stderr]     |
[INFO] [stderr] 140 |           lazy_static!{
[INFO] [stderr]     |  _________^
[INFO] [stderr] 141 | |             static ref SUBLINK: Regex = Regex::new(r"^&([0-9]*)$").unwrap();
[INFO] [stderr] 142 | |             static ref INTEGER: Regex = Regex::new(r"^([0-9]+)$").unwrap();
[INFO] [stderr] 143 | |             static ref FLOATP: Regex = Regex::new(r"^([0-9]+\.[0-9]+)$").unwrap();
[INFO] [stderr] 144 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(inclusive_range_syntax)] // range syntax additions
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `target_feature` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stderr]   |            ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `cfg_target_feature` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:5:28
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stderr]   |                            ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `match_default_bindings` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `match_beginning_vert` has been stable since 1.25.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:6:36
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stderr]   |                                    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `underscore_lifetimes` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `universal_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:8:34
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `dyn_trait` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:8:59
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stderr]   |                                                           ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `copy_closures` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:9:12
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stderr]   |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `clone_closures` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:9:27
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stderr]   |                           ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `termination_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:10:23
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `use_nested_groups` has been stable since 1.25.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `crate_in_paths` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:11:31
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `non_modrs_mods` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:11:74
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:12:24
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(decl_macro, proc_macro)] // macro improvements
[INFO] [stderr]    |                        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `nested_method_call`
[INFO] [stderr]  --> src/main.rs:7:58
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stderr]   |                                                          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `catch_expr`
[INFO] [stderr]   --> src/main.rs:10:42
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stderr]    |                                          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(inclusive_range_syntax)] // range syntax additions
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `target_feature` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stderr]   |            ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `cfg_target_feature` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:5:28
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(target_feature, cfg_target_feature)] // target feature branching
[INFO] [stderr]   |                            ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `match_default_bindings` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `match_beginning_vert` has been stable since 1.25.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:6:36
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(match_default_bindings, match_beginning_vert)] // simplify matching
[INFO] [stderr]   |                                    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `underscore_lifetimes` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `universal_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:8:34
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `dyn_trait` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:8:59
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(universal_impl_trait, conservative_impl_trait, dyn_trait)] // impl trait
[INFO] [stderr]   |                                                           ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `copy_closures` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:9:12
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stderr]   |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `clone_closures` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:9:27
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(copy_closures, clone_closures)] // closures enhancement
[INFO] [stderr]   |                           ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `termination_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:10:23
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `use_nested_groups` has been stable since 1.25.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `crate_in_paths` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:11:31
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `non_modrs_mods` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:11:74
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(use_nested_groups, crate_in_paths, crate_visibility_modifier, non_modrs_mods)] // module handling
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/main.rs:12:24
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(decl_macro, proc_macro)] // macro improvements
[INFO] [stderr]    |                        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `nested_method_call`
[INFO] [stderr]  --> src/main.rs:7:58
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(underscore_lifetimes, in_band_lifetimes, nll, nested_method_call)] // simplify lifetimes
[INFO] [stderr]   |                                                          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `catch_expr`
[INFO] [stderr]   --> src/main.rs:10:42
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(try_trait, termination_trait, catch_expr)] // error handling
[INFO] [stderr]    |                                          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `bracket2`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: could not compile `bracket2`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "53740c1ff5495e175a014a8b14578f94d9a3ced9755475d47286ab08048d55fc"`
[INFO] running `"docker" "rm" "-f" "53740c1ff5495e175a014a8b14578f94d9a3ced9755475d47286ab08048d55fc"`
[INFO] [stdout] 53740c1ff5495e175a014a8b14578f94d9a3ced9755475d47286ab08048d55fc
