[INFO] fetching crate gumdrop 0.8.1...
[INFO] checking gumdrop-0.8.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate gumdrop 0.8.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate gumdrop 0.8.1
[INFO] finished tweaking crates.io crate gumdrop 0.8.1
[INFO] tweaked toml for crates.io crate gumdrop 0.8.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate gumdrop 0.8.1 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate gumdrop 0.8.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 320ee75c8bf743cc6097aeca42a7b126bb1f0475cecc7f4359f82a44737a881c
[INFO] running `Command { std: "docker" "start" "-a" "320ee75c8bf743cc6097aeca42a7b126bb1f0475cecc7f4359f82a44737a881c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "320ee75c8bf743cc6097aeca42a7b126bb1f0475cecc7f4359f82a44737a881c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "320ee75c8bf743cc6097aeca42a7b126bb1f0475cecc7f4359f82a44737a881c", kill_on_drop: false }`
[INFO] [stdout] 320ee75c8bf743cc6097aeca42a7b126bb1f0475cecc7f4359f82a44737a881c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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 -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c9d6f44e7223fd0fbb781ef7dd4edfd4b04558ef5001fedc0da20bed2925bf8d
[INFO] running `Command { std: "docker" "start" "-a" "c9d6f44e7223fd0fbb781ef7dd4edfd4b04558ef5001fedc0da20bed2925bf8d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking assert_matches v1.3.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling gumdrop_derive v0.8.1
[INFO] [stderr]     Checking gumdrop v0.8.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> examples/commands.rs:38:17
[INFO] [stdout]    |
[INFO] [stdout] 38 | #[derive(Debug, Options)]
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> examples/commands.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 49 | #[derive(Debug, Options)]
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gumdrop` (example "commands") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> examples/options.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 | #[derive(Debug, Options)]
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gumdrop` (example "options") due to 1 previous error
[INFO] [stdout] warning: struct `Opts` is never constructed
[INFO] [stdout]   --> tests/options.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     struct Opts {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Cmd` is never used
[INFO] [stdout]   --> tests/options.rs:56:10
[INFO] [stdout]    |
[INFO] [stdout] 56 |     enum Cmd {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FooOpts` is never constructed
[INFO] [stdout]   --> tests/options.rs:62:12
[INFO] [stdout]    |
[INFO] [stdout] 62 |     struct FooOpts {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BarOpts` is never constructed
[INFO] [stdout]   --> tests/options.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 |     struct BarOpts {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> tests/options.rs:41:14
[INFO] [stdout]    |
[INFO] [stdout] 41 |     #[derive(Options)]
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> tests/options.rs:61:14
[INFO] [stdout]    |
[INFO] [stdout] 61 |     #[derive(Options)]
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> tests/options.rs:68:14
[INFO] [stdout]    |
[INFO] [stdout] 68 |     #[derive(Options)]
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:100:21
[INFO] [stdout]     |
[INFO] [stdout] 100 |     #[derive(Debug, Options)]
[INFO] [stdout]     |                     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:105:21
[INFO] [stdout]     |
[INFO] [stdout] 105 |     #[derive(Debug, Options)]
[INFO] [stdout]     |                     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:314:14
[INFO] [stdout]     |
[INFO] [stdout] 314 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:355:14
[INFO] [stdout]     |
[INFO] [stdout] 355 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:398:14
[INFO] [stdout]     |
[INFO] [stdout] 398 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:488:14
[INFO] [stdout]     |
[INFO] [stdout] 488 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:523:14
[INFO] [stdout]     |
[INFO] [stdout] 523 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:562:14
[INFO] [stdout]     |
[INFO] [stdout] 562 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:591:14
[INFO] [stdout]     |
[INFO] [stdout] 591 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:936:14
[INFO] [stdout]     |
[INFO] [stdout] 936 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> tests/options.rs:943:14
[INFO] [stdout]     |
[INFO] [stdout] 943 |     #[derive(Options)]
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]     --> tests/options.rs:1082:14
[INFO] [stdout]      |
[INFO] [stdout] 1082 |     #[derive(Options)]
[INFO] [stdout]      |              ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the derive macro `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gumdrop` (test "options") due to 15 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "c9d6f44e7223fd0fbb781ef7dd4edfd4b04558ef5001fedc0da20bed2925bf8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9d6f44e7223fd0fbb781ef7dd4edfd4b04558ef5001fedc0da20bed2925bf8d", kill_on_drop: false }`
[INFO] [stdout] c9d6f44e7223fd0fbb781ef7dd4edfd4b04558ef5001fedc0da20bed2925bf8d
