[INFO] fetching crate nop-json 2.0.5...
[INFO] testing nop-json-2.0.5 against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] extracting crate nop-json 2.0.5 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate nop-json 2.0.5 on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nop-json 2.0.5
[INFO] finished tweaking crates.io crate nop-json 2.0.5
[INFO] tweaked toml for crates.io crate nop-json 2.0.5 written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd2e6535fdf8aee336b440de5427c9e769b3e00539f3f088d1004171685582c8
[INFO] running `Command { std: "docker" "start" "-a" "fd2e6535fdf8aee336b440de5427c9e769b3e00539f3f088d1004171685582c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd2e6535fdf8aee336b440de5427c9e769b3e00539f3f088d1004171685582c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd2e6535fdf8aee336b440de5427c9e769b3e00539f3f088d1004171685582c8", kill_on_drop: false }`
[INFO] [stdout] fd2e6535fdf8aee336b440de5427c9e769b3e00539f3f088d1004171685582c8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 986ccc9d34ff22f0f7da38fe2c8107301e88c2382dc463dba035ff0c28c4f975
[INFO] running `Command { std: "docker" "start" "-a" "986ccc9d34ff22f0f7da38fe2c8107301e88c2382dc463dba035ff0c28c4f975", kill_on_drop: false }`
[INFO] [stderr]    Compiling numtoa v0.2.4
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling nop-json-derive v2.0.5
[INFO] [stderr]    Compiling nop-json v2.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1169:4
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             &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] 1169 |             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:1184:4
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             &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] 1184 |             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:1200:4
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             &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] 1200 |             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:2035:6
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    &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] 2035 |             {    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:2039:6
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    &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] 2039 |             {    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:2043:6
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    &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] 2043 |             {    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 9.19s
[INFO] running `Command { std: "docker" "inspect" "986ccc9d34ff22f0f7da38fe2c8107301e88c2382dc463dba035ff0c28c4f975", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "986ccc9d34ff22f0f7da38fe2c8107301e88c2382dc463dba035ff0c28c4f975", kill_on_drop: false }`
[INFO] [stdout] 986ccc9d34ff22f0f7da38fe2c8107301e88c2382dc463dba035ff0c28c4f975
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ba8588b3d01c4b2d48073a78ab0487fc632f0e85ad97fa5101b5b01bd4a83c7
[INFO] running `Command { std: "docker" "start" "-a" "4ba8588b3d01c4b2d48073a78ab0487fc632f0e85ad97fa5101b5b01bd4a83c7", 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:1169:4
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             &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] 1169 |             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:1184:4
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             &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] 1184 |             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:1200:4
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             &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] 1200 |             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:2035:6
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    &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] 2035 |             {    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:2039:6
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    &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] 2039 |             {    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:2043:6
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    &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] 2043 |             {    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 v2.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1169:4
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             &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] 1169 |             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:1184:4
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             &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] 1184 |             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:1200:4
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             &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] 1200 |             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:2035:6
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    &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] 2035 |             {    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:2039:6
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    &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] 2039 |             {    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:2043:6
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    &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] 2043 |             {    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 1.54s
[INFO] running `Command { std: "docker" "inspect" "4ba8588b3d01c4b2d48073a78ab0487fc632f0e85ad97fa5101b5b01bd4a83c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ba8588b3d01c4b2d48073a78ab0487fc632f0e85ad97fa5101b5b01bd4a83c7", kill_on_drop: false }`
[INFO] [stdout] 4ba8588b3d01c4b2d48073a78ab0487fc632f0e85ad97fa5101b5b01bd4a83c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 95286a5606930b11c806c21b1486a6ca0936c6813f16317d1523bdd599e208d1
[INFO] running `Command { std: "docker" "start" "-a" "95286a5606930b11c806c21b1486a6ca0936c6813f16317d1523bdd599e208d1", kill_on_drop: false }`
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/nop_json.rs:1169:4
[INFO] [stderr]      |
[INFO] [stderr] 1169 |             &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] 1169 |             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:1184:4
[INFO] [stderr]      |
[INFO] [stderr] 1184 |             &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] 1184 |             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:1200:4
[INFO] [stderr]      |
[INFO] [stderr] 1200 |             &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] 1200 |             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:2035:6
[INFO] [stderr]      |
[INFO] [stderr] 2035 |             {    &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] 2035 |             {    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:2039:6
[INFO] [stderr]      |
[INFO] [stderr] 2039 |             {    &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] 2039 |             {    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:2043:6
[INFO] [stderr]      |
[INFO] [stderr] 2043 |             {    &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] 2043 |             {    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 0.05s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/nop_json-cbca5bbede7cb5e4)
[INFO] [stdout] 
[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] [stderr]      Running tests/all.rs (/opt/rustwide/target/debug/deps/all-3557d91e3ba80b7d)
[INFO] [stdout] 
[INFO] [stdout] running 15 tests
[INFO] [stdout] test test_escape ... ok
[INFO] [stdout] test test_bytes ... ok
[INFO] [stdout] test test_write ... ok
[INFO] [stdout] test test_number_to_string ... ok
[INFO] [stdout] test test_to_json_string ... ok
[INFO] [stdout] test test_pipe ... ok
[INFO] [stdout] test test_value_is ... ok
[INFO] [stdout] test test_string ... ok
[INFO] [stdout] test test_char ... ok
[INFO] [stdout] test test_value_number_to_string ... ok
[INFO] [stdout] test test_escape_bytes ... ok
[INFO] [stdout] test test_object ... ok
[INFO] [stdout] test test_number_as_string ... ok
[INFO] [stdout] test test_number ... ok
[INFO] [stderr]    Doc-tests nop-json
[INFO] [stdout] test test_value ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 15 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 40 tests
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1247) - compile ... ok
[INFO] [stdout] test src/lib.rs - (line 37) - compile ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 721) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson (line 37) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson (line 28) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 571) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 543) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 611) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 688) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 108) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 591) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 675) ... FAILED
[INFO] [stdout] test src/validate_json.rs - validate_json::ValidateJson (line 13) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 633) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 661) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_object_use_buffer (line 2272) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 53) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_object (line 2175) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 75) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_array (line 2372) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2088) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::TryFromJson (line 757) ... FAILED
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1230) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson (line 16) ... ok
[INFO] [stdout] test src/lib.rs - (line 29) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1238) ... ok
[INFO] [stdout] test src/value.rs - value::Value (line 31) ... 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 1224) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson::to_json_string (line 63) ... ok
[INFO] [stdout] test src/escape.rs - escape::escape (line 12) ... ok
[INFO] [stdout] test src/lib.rs - (line 145) ... ok
[INFO] [stdout] test src/write_to_json.rs - write_to_json::WriteToJson (line 16) ... ok
[INFO] [stdout] test src/debug_to_json.rs - debug_to_json::DebugToJson::to_json_string (line 70) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::new (line 1218) ... ok
[INFO] [stdout] test src/lib.rs - (line 133) ... ok
[INFO] [stdout] test src/lib.rs - (line 95) ... ok
[INFO] [stdout] test src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2078) ... ok
[INFO] [stdout] test src/lib.rs - (line 177) ... ok
[INFO] [stdout] test src/lib.rs - (line 163) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 571) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 543) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 611) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 688) stdout ----
[INFO] [stdout] Couldn't compile the test.
[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 591) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 675) 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::TryFromJson (line 633) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 661) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::Reader<T>::read_object_use_buffer (line 2272) 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::Reader<T>::read_object (line 2175) 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_array (line 2372) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2088) stdout ----
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/nop_json.rs - nop_json::TryFromJson (line 757) 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 2372)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_blob (line 2088)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_object (line 2175)
[INFO] [stdout]     src/nop_json.rs - nop_json::Reader<T>::read_object_use_buffer (line 2272)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 543)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 571)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 591)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 611)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 633)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 661)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 675)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 688)
[INFO] [stdout]     src/nop_json.rs - nop_json::TryFromJson (line 757)
[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 11.43s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "95286a5606930b11c806c21b1486a6ca0936c6813f16317d1523bdd599e208d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95286a5606930b11c806c21b1486a6ca0936c6813f16317d1523bdd599e208d1", kill_on_drop: false }`
[INFO] [stdout] 95286a5606930b11c806c21b1486a6ca0936c6813f16317d1523bdd599e208d1