[INFO] fetching crate coercible_errors 0.1.4...
[INFO] checking coercible_errors-0.1.4 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate coercible_errors 0.1.4 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate coercible_errors 0.1.4
[INFO] finished tweaking crates.io crate coercible_errors 0.1.4
[INFO] tweaked toml for crates.io crate coercible_errors 0.1.4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate coercible_errors 0.1.4 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 13 packages to latest compatible versions
[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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] ff958d3c714a2a757ebbde651f50e79acce62b6d9d2ce7faa82b8fadb03fcfe8
[INFO] running `Command { std: "docker" "start" "-a" "ff958d3c714a2a757ebbde651f50e79acce62b6d9d2ce7faa82b8fadb03fcfe8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff958d3c714a2a757ebbde651f50e79acce62b6d9d2ce7faa82b8fadb03fcfe8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff958d3c714a2a757ebbde651f50e79acce62b6d9d2ce7faa82b8fadb03fcfe8", kill_on_drop: false }`
[INFO] [stdout] ff958d3c714a2a757ebbde651f50e79acce62b6d9d2ce7faa82b8fadb03fcfe8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 9b98abbc467d114c61381ab81205473d624be38eeb495aac2e3babb12b27cf6a
[INFO] running `Command { std: "docker" "start" "-a" "9b98abbc467d114c61381ab81205473d624be38eeb495aac2e3babb12b27cf6a", kill_on_drop: false }`
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]     Checking adler2 v2.0.1
[INFO] [stderr]     Checking gimli v0.32.3
[INFO] [stderr]     Checking memchr v2.7.6
[INFO] [stderr]     Checking rustc-demangle v0.1.26
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]     Checking miniz_oxide v0.8.9
[INFO] [stderr]     Checking addr2line v0.25.1
[INFO] [stderr]     Checking backtrace v0.3.76
[INFO] [stderr]     Checking coercible_errors v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `has_error_description_deprecated`
[INFO] [stdout]   --> src/test.rs:2:5
[INFO] [stdout]    |
[INFO] [stdout]  2 | /     error_chain! {
[INFO] [stdout]  3 | |         errors {
[INFO] [stdout]  4 | |             Producer {
[INFO] [stdout]  5 | |                 description("error occuredn in producer"),
[INFO] [stdout] ...  |
[INFO] [stdout] 11 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = help: expected names are: `docsrs`, `feature`, and `test` and 31 more
[INFO] [stdout]    = note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `impl_error_chain_processed` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the macro `impl_error_chain_processed` may come from an old version of the `error_chain` crate, try updating your dependency with `cargo update -p error_chain`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `impl_error_chain_processed` which comes from the expansion of the macro `error_chain` (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<u16, Never>
[INFO] [stdout]   --> src/test.rs:33:54
[INFO] [stdout]    |
[INFO] [stdout] 33 |       fn produce(&self) -> StdResult<u16, Self::Error> {
[INFO] [stdout]    |  ______________________________________________________^
[INFO] [stdout] 34 | |         Ok(*self)
[INFO] [stdout] 35 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u16, Never>
[INFO] [stdout]   --> src/test.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Ok(*self)
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u16, Never>
[INFO] [stdout]    --> src/test.rs:134:29
[INFO] [stdout]     |
[INFO] [stdout] 134 |     let _r: OkResult<u16> = 42_u16.produce();
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u16, Never>
[INFO] [stdout]    --> src/test.rs:150:29
[INFO] [stdout]     |
[INFO] [stdout] 150 |     let _r: OkResult<u16> = PMax(42_u16, 1_u16).produce();
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u16, Never>
[INFO] [stdout]    --> src/test.rs:190:29
[INFO] [stdout]     |
[INFO] [stdout] 190 |     let r1: OkResult<u16> = PMax(42_u16, 1_u16).produce();
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u16, Never>
[INFO] [stdout]    --> src/test.rs:195:13
[INFO] [stdout]     |
[INFO] [stdout] 195 |     assert!(r1.unwrap() == 42);
[INFO] [stdout]     |             ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `coercible_errors` (lib test) due to 6 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "9b98abbc467d114c61381ab81205473d624be38eeb495aac2e3babb12b27cf6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b98abbc467d114c61381ab81205473d624be38eeb495aac2e3babb12b27cf6a", kill_on_drop: false }`
[INFO] [stdout] 9b98abbc467d114c61381ab81205473d624be38eeb495aac2e3babb12b27cf6a
