[INFO] fetching crate viffy 0.1.5...
[INFO] testing viffy-0.1.5 against 1.91.0 for beta-1.92-2
[INFO] extracting crate viffy 0.1.5 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate viffy 0.1.5
[INFO] finished tweaking crates.io crate viffy 0.1.5
[INFO] tweaked toml for crates.io crate viffy 0.1.5 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate viffy 0.1.5 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate viffy 0.1.5 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 62d71646c2b83feb136197810abe4d8c3e3dd6eb52f3e2529b5a4a0b3f21d8dd
[INFO] running `Command { std: "docker" "start" "-a" "62d71646c2b83feb136197810abe4d8c3e3dd6eb52f3e2529b5a4a0b3f21d8dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "62d71646c2b83feb136197810abe4d8c3e3dd6eb52f3e2529b5a4a0b3f21d8dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62d71646c2b83feb136197810abe4d8c3e3dd6eb52f3e2529b5a4a0b3f21d8dd", kill_on_drop: false }`
[INFO] [stdout] 62d71646c2b83feb136197810abe4d8c3e3dd6eb52f3e2529b5a4a0b3f21d8dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4efcf62fd935d8a633508381291acaee7b980a603c7d82280dc4e282670dd5e0
[INFO] running `Command { std: "docker" "start" "-a" "4efcf62fd935d8a633508381291acaee7b980a603c7d82280dc4e282670dd5e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]    Compiling rayon v1.10.0
[INFO] [stderr]    Compiling viffy v0.1.5 (/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(associated_type_defaults)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(sync_unsafe_cell)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(allocator_api)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/math.rs:306:2
[INFO] [stdout]     |
[INFO] [stdout] 306 |     unsafe {
[INFO] [stdout]     |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/serializer.rs:235:7
[INFO] [stdout]     |
[INFO] [stdout] 235 |         for i in 0..(len_16 as usize) {
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 235 |         for _i in 0..(len_16 as usize) {
[INFO] [stdout]     |             +
[INFO] [stdout] help: you might have meant to pattern match on the similarly named constant `VECTOR_SIZE`
[INFO] [stdout]     |
[INFO] [stdout] 235 -         for i in 0..(len_16 as usize) {
[INFO] [stdout] 235 +         for vector::VECTOR_SIZE in 0..(len_16 as usize) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/serializer.rs:256:7
[INFO] [stdout]     |
[INFO] [stdout] 256 |         for i in 0..(len_16 as usize) {
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 256 |         for _i in 0..(len_16 as usize) {
[INFO] [stdout]     |             +
[INFO] [stdout] help: you might have meant to pattern match on the similarly named constant `VECTOR_SIZE`
[INFO] [stdout]     |
[INFO] [stdout] 256 -         for i in 0..(len_16 as usize) {
[INFO] [stdout] 256 +         for vector::VECTOR_SIZE in 0..(len_16 as usize) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `viffy` (lib) due to 4 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "4efcf62fd935d8a633508381291acaee7b980a603c7d82280dc4e282670dd5e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4efcf62fd935d8a633508381291acaee7b980a603c7d82280dc4e282670dd5e0", kill_on_drop: false }`
[INFO] [stdout] 4efcf62fd935d8a633508381291acaee7b980a603c7d82280dc4e282670dd5e0