[INFO] fetching crate ursa 0.3.7...
[INFO] checking ursa-0.3.7 against try#e251c42c969d6f8dbaae00e1028489c3a29f8789 for pr-94081
[INFO] extracting crate ursa 0.3.7 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ursa 0.3.7 on toolchain e251c42c969d6f8dbaae00e1028489c3a29f8789
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e251c42c969d6f8dbaae00e1028489c3a29f8789" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ursa 0.3.7
[INFO] finished tweaking crates.io crate ursa 0.3.7
[INFO] tweaked toml for crates.io crate ursa 0.3.7 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e251c42c969d6f8dbaae00e1028489c3a29f8789" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e251c42c969d6f8dbaae00e1028489c3a29f8789" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]   Downloaded secp256k1 v0.19.0
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[INFO] running `Command { std: "docker" "start" "-a" "e7c8d98ef851a6cdc28bf23f0214daca3a71966eb3f77f2d4e166cf9c22875ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7c8d98ef851a6cdc28bf23f0214daca3a71966eb3f77f2d4e166cf9c22875ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7c8d98ef851a6cdc28bf23f0214daca3a71966eb3f77f2d4e166cf9c22875ab", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+e251c42c969d6f8dbaae00e1028489c3a29f8789" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "d51590791a0eb24563503986cb9adf34fcbf362d70b341dd7e2b595017cae8f9", kill_on_drop: false }`
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[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/bn/openssl.rs:76:32
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let checks = prime_len.log2() as i32;
[INFO] [stdout]    |                                ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `log2(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(int_log)]` to the crate attributes to enable `failure::core::num::<impl usize>::log2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/bn/openssl.rs:76:32
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let checks = prime_len.log2() as i32;
[INFO] [stdout]    |                                ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `log2(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(int_log)]` to the crate attributes to enable `failure::core::num::<impl usize>::log2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.49s
[INFO] running `Command { std: "docker" "inspect" "d51590791a0eb24563503986cb9adf34fcbf362d70b341dd7e2b595017cae8f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d51590791a0eb24563503986cb9adf34fcbf362d70b341dd7e2b595017cae8f9", kill_on_drop: false }`
[INFO] [stdout] d51590791a0eb24563503986cb9adf34fcbf362d70b341dd7e2b595017cae8f9