[INFO] fetching crate zcash_client_backend 0.21.0...
[INFO] checking zcash_client_backend-0.21.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate zcash_client_backend 0.21.0 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate zcash_client_backend 0.21.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate zcash_client_backend 0.21.0
[INFO] tweaked toml for crates.io crate zcash_client_backend 0.21.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate zcash_client_backend 0.21.0 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 zcash_client_backend 0.21.0 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 }`
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[INFO] [stdout] 9d5b04ca8d2f4f3338c4cdb5a21b37871efae2ddb3ce46caba5c88b08e64b59d
[INFO] running `Command { std: "docker" "start" "-a" "9d5b04ca8d2f4f3338c4cdb5a21b37871efae2ddb3ce46caba5c88b08e64b59d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d5b04ca8d2f4f3338c4cdb5a21b37871efae2ddb3ce46caba5c88b08e64b59d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d5b04ca8d2f4f3338c4cdb5a21b37871efae2ddb3ce46caba5c88b08e64b59d", kill_on_drop: false }`
[INFO] [stdout] 9d5b04ca8d2f4f3338c4cdb5a21b37871efae2ddb3ce46caba5c88b08e64b59d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] fa25d2517d75031536e0e359bc256e6ee41ba277821d35b0847d6298962e4220
[INFO] running `Command { std: "docker" "start" "-a" "fa25d2517d75031536e0e359bc256e6ee41ba277821d35b0847d6298962e4220", kill_on_drop: false }`
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[INFO] [stdout] error: this type will no longer be must used: Result<(u32, UnifiedSpendingKey), zcash_keys::keys::DerivationError>
[INFO] [stdout]     --> src/data_api/testing.rs:2807:9
[INFO] [stdout]      |
[INFO] [stdout] 2807 | /         UnifiedSpendingKey::from_seed(&self.network, seed.expose_secret(), account)
[INFO] [stdout] 2808 | |             .map(|k| (u32::from(account), k))
[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<UnifiedSpendingKey, zcash_keys::keys::DerivationError>
[INFO] [stdout]     --> src/data_api/testing.rs:2807:9
[INFO] [stdout]      |
[INFO] [stdout] 2807 |         UnifiedSpendingKey::from_seed(&self.network, seed.expose_secret(), account)
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<UnifiedSpendingKey, zcash_keys::keys::DerivationError>
[INFO] [stdout]     --> src/data_api/testing/pool.rs:2624:16
[INFO] [stdout]      |
[INFO] [stdout] 2624 |     let usk1 = UnifiedSpendingKey::from_seed(st.network(), &[1u8; 32], acct1).unwrap();
[INFO] [stdout]      |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<UnifiedSpendingKey, zcash_keys::keys::DerivationError>
[INFO] [stdout]     --> src/scanning.rs:1358:17
[INFO] [stdout]      |
[INFO] [stdout] 1358 |                 UnifiedSpendingKey::from_seed(&network, &[0u8; 32], account).expect("Valid USK");
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<UnifiedSpendingKey, zcash_keys::keys::DerivationError>
[INFO] [stdout]     --> src/scanning.rs:1444:17
[INFO] [stdout]      |
[INFO] [stdout] 1444 |                 UnifiedSpendingKey::from_seed(&network, &[0u8; 32], account).expect("Valid USK");
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<UnifiedSpendingKey, zcash_keys::keys::DerivationError>
[INFO] [stdout]     --> src/scanning.rs:1518:19
[INFO] [stdout]      |
[INFO] [stdout] 1518 |         let usk = UnifiedSpendingKey::from_seed(&network, &[0u8; 32], account).expect("Valid USK");
[INFO] [stdout]      |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `zcash_client_backend` (lib test) due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "fa25d2517d75031536e0e359bc256e6ee41ba277821d35b0847d6298962e4220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa25d2517d75031536e0e359bc256e6ee41ba277821d35b0847d6298962e4220", kill_on_drop: false }`
[INFO] [stdout] fa25d2517d75031536e0e359bc256e6ee41ba277821d35b0847d6298962e4220