[INFO] fetching crate ooxml 0.1.2...
[INFO] testing ooxml-0.1.2 against 1.49.0 for beta-1.50-1
[INFO] extracting crate ooxml 0.1.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate ooxml 0.1.2 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ooxml 0.1.2
[INFO] finished tweaking crates.io crate ooxml 0.1.2
[INFO] tweaked toml for crates.io crate ooxml 0.1.2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate ooxml 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c7e9cefc1d1478438b05a6b262caa23fc7801fc1fa945a3e33fb7ac15fbe38b9
[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" "c7e9cefc1d1478438b05a6b262caa23fc7801fc1fa945a3e33fb7ac15fbe38b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c7e9cefc1d1478438b05a6b262caa23fc7801fc1fa945a3e33fb7ac15fbe38b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7e9cefc1d1478438b05a6b262caa23fc7801fc1fa945a3e33fb7ac15fbe38b9", kill_on_drop: false }`
[INFO] [stdout] c7e9cefc1d1478438b05a6b262caa23fc7801fc1fa945a3e33fb7ac15fbe38b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c001ed2ac8b59698789f66c90765b2aed3bce7d650e53713fdfc929260cd06c1
[INFO] running `Command { std: "docker" "start" "-a" "c001ed2ac8b59698789f66c90765b2aed3bce7d650e53713fdfc929260cd06c1", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling unicode_categories v0.1.1
[INFO] [stderr]    Compiling paste v1.0.3
[INFO] [stderr]    Compiling miniz_oxide v0.3.7
[INFO] [stderr]    Compiling flate2 v1.0.14
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling thiserror-impl v1.0.22
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]    Compiling thiserror v1.0.22
[INFO] [stderr]    Compiling snailquote v0.3.0
[INFO] [stderr]    Compiling zip v0.5.9
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling serde_test v1.0.118
[INFO] [stderr]    Compiling quick-xml v0.20.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]    Compiling linked-hash-map v0.5.3
[INFO] [stderr]    Compiling ooxml v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(str_split_once)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quick_xml::events::*`
[INFO] [stdout]   --> src/packaging/element.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use quick_xml::events::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `borrow::Cow`
[INFO] [stdout]  --> src/document/spreadsheet/mod.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{borrow::Cow, cell::RefCell};
[INFO] [stdout]   |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DateTime`, `Local`
[INFO] [stdout]  --> src/document/spreadsheet/cell.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 3 | use chrono::{DateTime, NaiveDateTime, Local};
[INFO] [stdout]   |              ^^^^^^^^                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quick_xml::events::*`
[INFO] [stdout]    --> src/document/spreadsheet/worksheet.rs:218:13
[INFO] [stdout]     |
[INFO] [stdout] 218 |         use quick_xml::events::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ooxml`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "c001ed2ac8b59698789f66c90765b2aed3bce7d650e53713fdfc929260cd06c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c001ed2ac8b59698789f66c90765b2aed3bce7d650e53713fdfc929260cd06c1", kill_on_drop: false }`
[INFO] [stdout] c001ed2ac8b59698789f66c90765b2aed3bce7d650e53713fdfc929260cd06c1