[INFO] cloning repository https://github.com/6A/nixcfg
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/6A/nixcfg" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F6A%2Fnixcfg", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F6A%2Fnixcfg'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 79bf77f6e7cbe99a9774bf7988458b3350c41695
[INFO] testing 6A/nixcfg against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F6A%2Fnixcfg" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/6A/nixcfg on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/6A/nixcfg
[INFO] finished tweaking git repo https://github.com/6A/nixcfg
[INFO] tweaked toml for git repo https://github.com/6A/nixcfg written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/6A/nixcfg already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cce82760e90622db2ad8829d2de1c27710dc98f28cd07d255ae4bca04bbfb220
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cce82760e90622db2ad8829d2de1c27710dc98f28cd07d255ae4bca04bbfb220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cce82760e90622db2ad8829d2de1c27710dc98f28cd07d255ae4bca04bbfb220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cce82760e90622db2ad8829d2de1c27710dc98f28cd07d255ae4bca04bbfb220", kill_on_drop: false }`
[INFO] [stdout] cce82760e90622db2ad8829d2de1c27710dc98f28cd07d255ae4bca04bbfb220
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 803d02e0d80988f25c188dd8e8dfba18ac29f854e5b2c3b532b328288a8417d7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "803d02e0d80988f25c188dd8e8dfba18ac29f854e5b2c3b532b328288a8417d7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.18
[INFO] [stderr]    Compiling cc v1.0.24
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling smol_str v0.1.6
[INFO] [stderr]    Compiling arenatree v0.1.0
[INFO] [stderr]    Compiling textwrap v0.10.0
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling backtrace v0.3.9
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]    Compiling structopt-derive v0.2.10
[INFO] [stderr]    Compiling failure v0.1.2
[INFO] [stderr]    Compiling rnix v0.4.0
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/lib.rs:19:14
[INFO] [stdout]    |
[INFO] [stdout] 19 | #[macro_use] crate mod utils;
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/mod.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | crate mod stack;
[INFO] [stdout]   | ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]   = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | crate struct Stack<I> {
[INFO] [stdout]   | ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]   = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     crate fn new(buffer: [Option<I>; 2]) -> Self {
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]   = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     crate fn first_free_index(&self) -> usize {
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     crate fn first_free(&mut self) -> &mut Option<I> {
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     crate fn peek(&self) -> Option<&I> {
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     crate fn is_empty(&self) -> bool {
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     crate fn push(&mut self, val: I) {
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/utils/stack.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     crate fn pop(&mut self) -> Option<I> {
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]    = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/parser/mod.rs:176:1
[INFO] [stdout]     |
[INFO] [stdout] 176 | crate type Error = (Option<Span>, ParseError);
[INFO] [stdout]     | ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]     = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `crate` visibility modifier is experimental
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rnix-0.4.0/src/parser/mod.rs:177:1
[INFO] [stdout]     |
[INFO] [stdout] 177 | crate type Result<T> = std::result::Result<T, Error>;
[INFO] [stdout]     | ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #53120 <https://github.com/rust-lang/rust/issues/53120> for more information
[INFO] [stdout]     = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling structopt v0.2.10
[INFO] [stdout] error: aborting due to 12 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rnix` due to 13 previous errors
[INFO] running `Command { std: "docker" "inspect" "803d02e0d80988f25c188dd8e8dfba18ac29f854e5b2c3b532b328288a8417d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "803d02e0d80988f25c188dd8e8dfba18ac29f854e5b2c3b532b328288a8417d7", kill_on_drop: false }`
[INFO] [stdout] 803d02e0d80988f25c188dd8e8dfba18ac29f854e5b2c3b532b328288a8417d7