[INFO] fetching crate jsonfmt 0.4.1...
[INFO] checking jsonfmt-0.4.1 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] extracting crate jsonfmt 0.4.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate jsonfmt 0.4.1 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate jsonfmt 0.4.1
[INFO] finished tweaking crates.io crate jsonfmt 0.4.1
[INFO] tweaked toml for crates.io crate jsonfmt 0.4.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate jsonfmt 0.4.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pico-args v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d38b4caed09cae4cb969bbc3903988c0eece08728bc271f7542190ff012d6f5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0d38b4caed09cae4cb969bbc3903988c0eece08728bc271f7542190ff012d6f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d38b4caed09cae4cb969bbc3903988c0eece08728bc271f7542190ff012d6f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d38b4caed09cae4cb969bbc3903988c0eece08728bc271f7542190ff012d6f5", kill_on_drop: false }`
[INFO] [stdout] 0d38b4caed09cae4cb969bbc3903988c0eece08728bc271f7542190ff012d6f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d51930812caa45b71cd7ac768f313653f2fdee0b70ca530ab2b80a413a96d1dc
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d51930812caa45b71cd7ac768f313653f2fdee0b70ca530ab2b80a413a96d1dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.102
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]     Checking pico-args v0.3.0
[INFO] [stderr]    Compiling indexmap v1.3.0
[INFO] [stderr]     Checking serde_json v1.0.41
[INFO] [stderr]     Checking jsonfmt v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: allow(dead_code) incompatible with previous forbid
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(forbidden_lint_groups)]` on by default
[INFO] [stdout]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]   = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:37:22
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 37 |         output_file: args.opt_value_from_str("-o")?,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:39:15
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 39 |         free: args.free()?,
[INFO] [stdout]    |               ^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: allow(dead_code) incompatible with previous forbid
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]   = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:37:22
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 37 |         output_file: args.opt_value_from_str("-o")?,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(forbidden_lint_groups)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:37:22
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 37 |         output_file: args.opt_value_from_str("-o")?,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:39:15
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 39 |         free: args.free()?,
[INFO] [stdout]    |               ^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #81670 <https://github.com/rust-lang/rust/issues/81670>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.38s
[INFO] running `Command { std: "docker" "inspect" "d51930812caa45b71cd7ac768f313653f2fdee0b70ca530ab2b80a413a96d1dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d51930812caa45b71cd7ac768f313653f2fdee0b70ca530ab2b80a413a96d1dc", kill_on_drop: false }`
[INFO] [stdout] d51930812caa45b71cd7ac768f313653f2fdee0b70ca530ab2b80a413a96d1dc