[INFO] cloning repository https://github.com/Andrey-Kosarev/dstructures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Andrey-Kosarev/dstructures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAndrey-Kosarev%2Fdstructures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAndrey-Kosarev%2Fdstructures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9df0c28c0db28134bfaf796e2d50b51e17bde264
[INFO] checking Andrey-Kosarev/dstructures against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAndrey-Kosarev%2Fdstructures" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Andrey-Kosarev/dstructures
[INFO] finished tweaking git repo https://github.com/Andrey-Kosarev/dstructures
[INFO] tweaked toml for git repo https://github.com/Andrey-Kosarev/dstructures written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Andrey-Kosarev/dstructures on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Andrey-Kosarev/dstructures 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a86f59e02001f60c8f0b9b1e7b0119ac1077e7ad76b81172ae1351c0e80fa965
[INFO] running `Command { std: "docker" "start" "-a" "a86f59e02001f60c8f0b9b1e7b0119ac1077e7ad76b81172ae1351c0e80fa965", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a86f59e02001f60c8f0b9b1e7b0119ac1077e7ad76b81172ae1351c0e80fa965", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a86f59e02001f60c8f0b9b1e7b0119ac1077e7ad76b81172ae1351c0e80fa965", kill_on_drop: false }`
[INFO] [stdout] a86f59e02001f60c8f0b9b1e7b0119ac1077e7ad76b81172ae1351c0e80fa965
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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 -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 09e56c99531c8399cb1844a5fcf5e18b5412a58463b4e7f15ab5f500c95ead9a
[INFO] running `Command { std: "docker" "start" "-a" "09e56c99531c8399cb1844a5fcf5e18b5412a58463b4e7f15ab5f500c95ead9a", kill_on_drop: false }`
[INFO] [stderr]    Compiling target-lexicon v0.13.2
[INFO] [stderr]    Compiling once_cell v1.21.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling indoc v2.0.6
[INFO] [stderr]     Checking unindent v0.2.4
[INFO] [stderr]    Compiling memoffset v0.9.1
[INFO] [stderr]    Compiling pyo3-build-config v0.24.0
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]    Compiling pyo3-ffi v0.24.0
[INFO] [stderr]    Compiling pyo3-macros-backend v0.24.0
[INFO] [stderr]    Compiling pyo3 v0.24.0
[INFO] [stderr]    Compiling pyo3-macros v0.24.0
[INFO] [stderr]     Checking dstructures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `dstructures` (lib) due to 2 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<lists::linked_list::LinkedList, Infallible>
[INFO] [stdout]   --> src/lists/linked_list.rs:31:42
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn prepend(&self, value: i32) -> LinkedList{
[INFO] [stdout]    |                                          ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/lists/linked_list.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn print(&self) -> String {
[INFO] [stdout]    |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<lists::linked_list::LinkedList, Infallible>
[INFO] [stdout]   --> src/lists/linked_list.rs:31:42
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn prepend(&self, value: i32) -> LinkedList{
[INFO] [stdout]    |                                          ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/lists/linked_list.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn print(&self) -> String {
[INFO] [stdout]    |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dstructures` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "09e56c99531c8399cb1844a5fcf5e18b5412a58463b4e7f15ab5f500c95ead9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09e56c99531c8399cb1844a5fcf5e18b5412a58463b4e7f15ab5f500c95ead9a", kill_on_drop: false }`
[INFO] [stdout] 09e56c99531c8399cb1844a5fcf5e18b5412a58463b4e7f15ab5f500c95ead9a