[INFO] cloning repository https://github.com/jfeldman325/Rust-Learning-Examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jfeldman325/Rust-Learning-Examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjfeldman325%2FRust-Learning-Examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjfeldman325%2FRust-Learning-Examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b32ce13aa45e32e6b5473a7ae44a9897c30e6af0
[INFO] checking jfeldman325/Rust-Learning-Examples against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjfeldman325%2FRust-Learning-Examples" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jfeldman325/Rust-Learning-Examples on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jfeldman325/Rust-Learning-Examples
[INFO] finished tweaking git repo https://github.com/jfeldman325/Rust-Learning-Examples
[INFO] tweaked toml for git repo https://github.com/jfeldman325/Rust-Learning-Examples written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/jfeldman325/Rust-Learning-Examples already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", 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] a2f32dd7cba90636ebe62ad3af338cffb3630d4d3c85c2802ec312aaeed18e99
[INFO] running `Command { std: "docker" "start" "-a" "a2f32dd7cba90636ebe62ad3af338cffb3630d4d3c85c2802ec312aaeed18e99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2f32dd7cba90636ebe62ad3af338cffb3630d4d3c85c2802ec312aaeed18e99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2f32dd7cba90636ebe62ad3af338cffb3630d4d3c85c2802ec312aaeed18e99", kill_on_drop: false }`
[INFO] [stdout] a2f32dd7cba90636ebe62ad3af338cffb3630d4d3c85c2802ec312aaeed18e99
[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=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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b0d5ed1fe3e2f5cc510f3afa04e9667368cfda9066d4fc6a3467b496a4e9fb96
[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" "b0d5ed1fe3e2f5cc510f3afa04e9667368cfda9066d4fc6a3467b496a4e9fb96", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]     Checking traits v0.1.0 (/opt/rustwide/workdir/traits)
[INFO] [stderr]     Checking lifetimes v0.1.0 (/opt/rustwide/workdir/lifetimes)
[INFO] [stdout] warning: unused variable: `tweet`
[INFO] [stdout]   --> traits/src/main.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let tweet = Tweet {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_tweet`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]  --> traits/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         &self.summarize()[0..4]
[INFO] [stdout]   |         ^----------------^^^^^^
[INFO] [stdout]   |         ||
[INFO] [stdout]   |         |temporary value created here
[INFO] [stdout]   |         returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `traits` due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stdout]   --> lifetimes/src/main.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> lifetimes/src/main.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn longest_with_an_announcement<T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b0d5ed1fe3e2f5cc510f3afa04e9667368cfda9066d4fc6a3467b496a4e9fb96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0d5ed1fe3e2f5cc510f3afa04e9667368cfda9066d4fc6a3467b496a4e9fb96", kill_on_drop: false }`
[INFO] [stdout] b0d5ed1fe3e2f5cc510f3afa04e9667368cfda9066d4fc6a3467b496a4e9fb96