[INFO] fetching crate stringdex 0.0.2...
[INFO] checking stringdex-0.0.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate stringdex 0.0.2 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate stringdex 0.0.2
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate stringdex 0.0.2
[INFO] tweaked toml for crates.io crate stringdex 0.0.2 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate stringdex 0.0.2 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 crates.io crate stringdex 0.0.2 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 14f61e7ef9cdf0eece496747655744df2581f06174a39479d05eacb47a4d7199
[INFO] running `Command { std: "docker" "start" "-a" "14f61e7ef9cdf0eece496747655744df2581f06174a39479d05eacb47a4d7199", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "14f61e7ef9cdf0eece496747655744df2581f06174a39479d05eacb47a4d7199", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14f61e7ef9cdf0eece496747655744df2581f06174a39479d05eacb47a4d7199", kill_on_drop: false }`
[INFO] [stdout] 14f61e7ef9cdf0eece496747655744df2581f06174a39479d05eacb47a4d7199
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 94c26f93eae90aa36a944875ecbbc2bfd6c21a9315f539fa9f4181cb5bf4aa16
[INFO] running `Command { std: "docker" "start" "-a" "94c26f93eae90aa36a944875ecbbc2bfd6c21a9315f539fa9f4181cb5bf4aa16", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.175
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]     Checking cfg-if v1.0.3
[INFO] [stderr]     Checking regex-syntax v0.8.6
[INFO] [stderr]    Compiling cc v1.2.34
[INFO] [stderr]     Checking log v0.4.27
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]    Compiling mutants v0.0.3
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking serde_json v1.0.143
[INFO] [stderr]     Checking csv-core v0.1.12
[INFO] [stderr]     Checking csv v1.3.1
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]     Checking getrandom v0.2.16
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling psm v0.1.26
[INFO] [stderr]    Compiling stacker v0.1.21
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex-automata v0.4.10
[INFO] [stderr]     Checking stringdex v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `other_node_i` is never read
[INFO] [stdout]    --> src/internals/mod.rs:963:29
[INFO] [stdout]     |
[INFO] [stdout] 963 | ...                   other_node_i += 6;
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u8, Infallible>
[INFO] [stdout]     --> src/internals/mod.rs:1015:25
[INFO] [stdout]      |
[INFO] [stdout] 1015 |             outbuf.push(u8::try_from(data_len).expect("compressed node can only have data < 256") | no_leaves_flag);
[INFO] [stdout]      |                         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `stringdex` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "94c26f93eae90aa36a944875ecbbc2bfd6c21a9315f539fa9f4181cb5bf4aa16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94c26f93eae90aa36a944875ecbbc2bfd6c21a9315f539fa9f4181cb5bf4aa16", kill_on_drop: false }`
[INFO] [stdout] 94c26f93eae90aa36a944875ecbbc2bfd6c21a9315f539fa9f4181cb5bf4aa16