[INFO] fetching crate json_io 0.3.0...
[INFO] checking json_io-0.3.0 against try#b2f80f6008cdafc35b4472bd46afa16cc6b0cd63 for pr-79470
[INFO] extracting crate json_io 0.3.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate json_io 0.3.0 on toolchain b2f80f6008cdafc35b4472bd46afa16cc6b0cd63
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate json_io 0.3.0
[INFO] finished tweaking crates.io crate json_io 0.3.0
[INFO] tweaked toml for crates.io crate json_io 0.3.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded find_folder v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 27bb89aa1bb6a9853ebc0dcd263dd72a310bfe2282ce6e353872b72fd3efc17a
[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" "27bb89aa1bb6a9853ebc0dcd263dd72a310bfe2282ce6e353872b72fd3efc17a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "27bb89aa1bb6a9853ebc0dcd263dd72a310bfe2282ce6e353872b72fd3efc17a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27bb89aa1bb6a9853ebc0dcd263dd72a310bfe2282ce6e353872b72fd3efc17a", kill_on_drop: false }`
[INFO] [stdout] 27bb89aa1bb6a9853ebc0dcd263dd72a310bfe2282ce6e353872b72fd3efc17a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91f203f8042008448ebd7a602ed534e728824dec0a9bb7332f2ab3451d92dcf9
[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" "91f203f8042008448ebd7a602ed534e728824dec0a9bb7332f2ab3451d92dcf9", kill_on_drop: false }`
[INFO] [stderr]     Checking dtoa v0.4.6
[INFO] [stderr]     Checking itoa v0.3.4
[INFO] [stderr]     Checking serde v0.9.15
[INFO] [stderr]     Checking find_folder v0.3.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking serde_json v0.9.10
[INFO] [stderr]     Checking json_io v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:89:21
[INFO] [stdout]    |
[INFO] [stdout] 89 |                     try!(std::fs::File::open(&path.with_extension("json"))),
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |         try!(std::io::Read::read_to_end(&mut file, &mut contents));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:95:24
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let json_str = try!(std::str::from_utf8(&contents[..]));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:96:20
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let t: T = try!(serde_json::from_str(&json_str));
[INFO] [stdout]    |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let json_string = try!(serde_json::to_string(&t));
[INFO] [stdout]     |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:109:24
[INFO] [stdout]     |
[INFO] [stdout] 109 |         let mut file = try!(std::fs::File::create(&path.with_extension("json")));
[INFO] [stdout]     |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         try!(std::io::Write::write_all(&mut file, json_string.as_bytes()));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:89:21
[INFO] [stdout]    |
[INFO] [stdout] 89 |                     try!(std::fs::File::open(&path.with_extension("json"))),
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |         try!(std::io::Read::read_to_end(&mut file, &mut contents));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:95:24
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let json_str = try!(std::str::from_utf8(&contents[..]));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:96:20
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let t: T = try!(serde_json::from_str(&json_str));
[INFO] [stdout]    |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let json_string = try!(serde_json::to_string(&t));
[INFO] [stdout]     |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:109:24
[INFO] [stdout]     |
[INFO] [stdout] 109 |         let mut file = try!(std::fs::File::create(&path.with_extension("json")));
[INFO] [stdout]     |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         try!(std::io::Write::write_all(&mut file, json_string.as_bytes()));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:50:39
[INFO] [stdout]    |
[INFO] [stdout] 50 |                 Error::IO(ref err) => std::error::Error::description(err),
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:51:41
[INFO] [stdout]    |
[INFO] [stdout] 51 |                 Error::Utf8(ref err) => std::error::Error::description(err),
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:52:41
[INFO] [stdout]    |
[INFO] [stdout] 52 |                 Error::Json(ref err) => std::error::Error::description(err),
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:50:39
[INFO] [stdout]    |
[INFO] [stdout] 50 |                 Error::IO(ref err) => std::error::Error::description(err),
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:51:41
[INFO] [stdout]    |
[INFO] [stdout] 51 |                 Error::Utf8(ref err) => std::error::Error::description(err),
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/lib.rs:52:41
[INFO] [stdout]    |
[INFO] [stdout] 52 |                 Error::Json(ref err) => std::error::Error::description(err),
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.79s
[INFO] running `Command { std: "docker" "inspect" "91f203f8042008448ebd7a602ed534e728824dec0a9bb7332f2ab3451d92dcf9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91f203f8042008448ebd7a602ed534e728824dec0a9bb7332f2ab3451d92dcf9", kill_on_drop: false }`
[INFO] [stdout] 91f203f8042008448ebd7a602ed534e728824dec0a9bb7332f2ab3451d92dcf9