[INFO] fetching crate nop-json 2.0.4...
[INFO] testing nop-json-2.0.4 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate nop-json 2.0.4 into /workspace/builds/worker-30/source
[INFO] validating manifest of crates.io crate nop-json 2.0.4 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nop-json 2.0.4
[INFO] finished tweaking crates.io crate nop-json 2.0.4
[INFO] tweaked toml for crates.io crate nop-json 2.0.4 written to /workspace/builds/worker-30/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nop-json-derive v2.0.4
[INFO] [stderr]   Downloaded read_iter v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6652036f6f8fc1c9bda16a60ab08c78aea4eab17692cef466ac4af51a5d4e7c1
[INFO] running `Command { std: "docker" "start" "-a" "6652036f6f8fc1c9bda16a60ab08c78aea4eab17692cef466ac4af51a5d4e7c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6652036f6f8fc1c9bda16a60ab08c78aea4eab17692cef466ac4af51a5d4e7c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6652036f6f8fc1c9bda16a60ab08c78aea4eab17692cef466ac4af51a5d4e7c1", kill_on_drop: false }`
[INFO] [stdout] 6652036f6f8fc1c9bda16a60ab08c78aea4eab17692cef466ac4af51a5d4e7c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 752f2af69a40985489ee2d4813bdb2ca4bf3554008dddbdec7b0c629fa005f66
[INFO] running `Command { std: "docker" "start" "-a" "752f2af69a40985489ee2d4813bdb2ca4bf3554008dddbdec7b0c629fa005f66", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling numtoa v0.2.4
[INFO] [stderr]    Compiling nop-json-derive v2.0.4
[INFO] [stderr]    Compiling nop-json v2.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1150:4
[INFO] [stdout]      |
[INFO] [stdout] 1150 |             &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1150 |             let _ = &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1165:4
[INFO] [stdout]      |
[INFO] [stdout] 1165 |             &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1165 |             let _ = &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1181:4
[INFO] [stdout]      |
[INFO] [stdout] 1181 |             &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1181 |             let _ = &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2022:6
[INFO] [stdout]      |
[INFO] [stdout] 2022 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2022 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2026:6
[INFO] [stdout]      |
[INFO] [stdout] 2026 |             {    &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2026 |             {    let _ = &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2030:6
[INFO] [stdout]      |
[INFO] [stdout] 2030 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2030 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/debug_to_json.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 let _ = &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.37s
[INFO] running `Command { std: "docker" "inspect" "752f2af69a40985489ee2d4813bdb2ca4bf3554008dddbdec7b0c629fa005f66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "752f2af69a40985489ee2d4813bdb2ca4bf3554008dddbdec7b0c629fa005f66", kill_on_drop: false }`
[INFO] [stdout] 752f2af69a40985489ee2d4813bdb2ca4bf3554008dddbdec7b0c629fa005f66
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 705e841604bc70c9afd645029fdceb741469a9fe0f952bf6622a496f4f1c8ce8
[INFO] running `Command { std: "docker" "start" "-a" "705e841604bc70c9afd645029fdceb741469a9fe0f952bf6622a496f4f1c8ce8", kill_on_drop: false }`
[INFO] [stderr]    Compiling read_iter v0.1.2
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1150:4
[INFO] [stdout]      |
[INFO] [stdout] 1150 |             &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1150 |             let _ = &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1165:4
[INFO] [stdout]      |
[INFO] [stdout] 1165 |             &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1165 |             let _ = &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1181:4
[INFO] [stdout]      |
[INFO] [stdout] 1181 |             &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1181 |             let _ = &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2022:6
[INFO] [stdout]      |
[INFO] [stdout] 2022 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2022 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2026:6
[INFO] [stdout]      |
[INFO] [stdout] 2026 |             {    &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2026 |             {    let _ = &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2030:6
[INFO] [stdout]      |
[INFO] [stdout] 2030 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2030 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/debug_to_json.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 let _ = &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling nop-json v2.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1150:4
[INFO] [stdout]      |
[INFO] [stdout] 1150 |             &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1150 |             let _ = &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1165:4
[INFO] [stdout]      |
[INFO] [stdout] 1165 |             &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1165 |             let _ = &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1181:4
[INFO] [stdout]      |
[INFO] [stdout] 1181 |             &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1181 |             let _ = &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2022:6
[INFO] [stdout]      |
[INFO] [stdout] 2022 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2022 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2026:6
[INFO] [stdout]      |
[INFO] [stdout] 2026 |             {    &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2026 |             {    let _ = &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2030:6
[INFO] [stdout]      |
[INFO] [stdout] 2030 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2030 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/debug_to_json.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 let _ = &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.10s
[INFO] running `Command { std: "docker" "inspect" "705e841604bc70c9afd645029fdceb741469a9fe0f952bf6622a496f4f1c8ce8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "705e841604bc70c9afd645029fdceb741469a9fe0f952bf6622a496f4f1c8ce8", kill_on_drop: false }`
[INFO] [stdout] 705e841604bc70c9afd645029fdceb741469a9fe0f952bf6622a496f4f1c8ce8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8c92fd302714f7a415762dee74a261215d6e1eaca564520eee0c0995f1e695bd
[INFO] running `Command { std: "docker" "start" "-a" "8c92fd302714f7a415762dee74a261215d6e1eaca564520eee0c0995f1e695bd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:1150:4
[INFO] [stderr]      |
[INFO] [stderr] 1150 |             &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1150 |             let _ = &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:1165:4
[INFO] [stderr]      |
[INFO] [stderr] 1165 |             &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1165 |             let _ = &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:1181:4
[INFO] [stderr]      |
[INFO] [stderr] 1181 |             &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1181 |             let _ = &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:2022:6
[INFO] [stderr]      |
[INFO] [stderr] 2022 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stderr]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 2022 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stderr]      |                  +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:2026:6
[INFO] [stderr]      |
[INFO] [stderr] 2026 |             {    &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stderr]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 2026 |             {    let _ = &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stderr]      |                  +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:2030:6
[INFO] [stderr]      |
[INFO] [stderr] 2030 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stderr]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 2030 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stderr]      |                  +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/debug_to_json.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 176 |                 &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 176 |                 let _ = &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stderr]     |                 +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `nop-json` (lib) generated 7 warnings
[INFO] [stderr] warning: `nop-json` (lib test) generated 7 warnings (7 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/nop_json-abab7ac94be90054)
[INFO] [stdout] 
[INFO] [stderr]      Running tests/all.rs (/opt/rustwide/target/debug/deps/all-cf59bbecbf506ffa)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 14 tests
[INFO] [stdout] test test_bytes ... ok
[INFO] [stdout] test test_char ... ok
[INFO] [stdout] test test_escape ... ok
[INFO] [stdout] test test_escape_bytes ... ok
[INFO] [stdout] test test_number ... ok
[INFO] [stdout] test test_number_as_string ... ok
[INFO] [stdout] test test_number_to_string ... ok
[INFO] [stdout] test test_object ... ok
[INFO] [stdout] test test_string ... ok
[INFO] [stdout] test test_pipe ... ok
[INFO] [stdout] test test_to_json_string ... ok
[INFO] [stdout] test test_value ... ok
[INFO] [stdout] test test_write ... ok
[INFO] [stdout] test test_value_number_to_string ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests nop-json
[INFO] [stdout] 
[INFO] [stdout] running 40 tests
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1228) - compile ... ok
[INFO] [stdout] test src/lib.rs - (line 37) - compile ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson (line 28) ... ok
[INFO] [stdout] test src/escape.rs - escape::escape (line 12) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson::to_json_string (line 70) ... ok
[INFO] [stdout] test src/lib.rs - (line 29) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson (line 16) ... ok
[INFO] [stdout] test src/lib.rs - (line 108) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 592) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_object_use_buffer (line 2259) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 552) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 524) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 572) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_array (line 2359) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 53) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 669) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 656) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 642) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 614) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 75) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2075) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 738) ... FAILED
[INFO] [stdout] test src/validate_json.rs - validate_json::ValidateJson (line 13) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_object (line 2162) ... FAILED
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson (line 37) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 702) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson::to_json_string (line 63) ... ok
[INFO] [stdout] test src/lib.rs - (line 163) ... ok
[INFO] [stdout] test src/value.rs - value::Value (line 20) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1205) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1211) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1219) ... ok
[INFO] [stdout] test src/value.rs - value::Value (line 31) ... ok
[INFO] [stdout] test src/write_to_json.rs - write_to_json::WriteToJson (line 16) ... ok
[INFO] [stdout] test src/lib.rs - (line 177) ... ok
[INFO] [stdout] test src/lib.rs - (line 95) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2065) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1199) ... ok
[INFO] [stdout] test src/lib.rs - (line 145) ... ok
[INFO] [stdout] test src/lib.rs - (line 133) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 108) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 592) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::Reader<T>::read_object_use_buffer (line 2259) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 552) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 524) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 572) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::Reader<T>::read_array (line 2359) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 53) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 669) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 656) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 642) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 614) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 75) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2075) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 738) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/validate_json.rs - validate_json::ValidateJson (line 13) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::Reader<T>::read_object (line 2162) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 108)
[INFO] [stdout]     src/lib.rs - (line 53)
[INFO] [stdout]     src/lib.rs - (line 75)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_array (line 2359)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2075)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_object (line 2162)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_object_use_buffer (line 2259)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 524)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 552)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 572)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 592)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 614)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 642)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 656)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 669)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 738)
[INFO] [stdout]     src/validate_json.rs - validate_json::ValidateJson (line 13)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 23 passed; 17 failed; 0 ignored; 0 measured; 0 filtered out; finished in 35.69s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "8c92fd302714f7a415762dee74a261215d6e1eaca564520eee0c0995f1e695bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c92fd302714f7a415762dee74a261215d6e1eaca564520eee0c0995f1e695bd", kill_on_drop: false }`
[INFO] [stdout] 8c92fd302714f7a415762dee74a261215d6e1eaca564520eee0c0995f1e695bd