[INFO] fetching crate synonym 0.1.6...
[INFO] checking synonym-0.1.6 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate synonym 0.1.6 into /workspace/builds/worker-0-tc2/source
[INFO] removed /workspace/builds/worker-0-tc2/source/rust-toolchain
[INFO] started tweaking crates.io crate synonym 0.1.6
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate synonym 0.1.6
[INFO] tweaked toml for crates.io crate synonym 0.1.6 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate synonym 0.1.6 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 33 packages to latest compatible versions
[INFO] [stderr]       Adding darling v0.20.11 (available: v0.21.3)
[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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] b4bbe82159b9133b05ffcf752be39c3107cdebe7b10b3e37737eac954f3d75ec
[INFO] running `Command { std: "docker" "start" "-a" "b4bbe82159b9133b05ffcf752be39c3107cdebe7b10b3e37737eac954f3d75ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4bbe82159b9133b05ffcf752be39c3107cdebe7b10b3e37737eac954f3d75ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4bbe82159b9133b05ffcf752be39c3107cdebe7b10b3e37737eac954f3d75ec", kill_on_drop: false }`
[INFO] [stdout] b4bbe82159b9133b05ffcf752be39c3107cdebe7b10b3e37737eac954f3d75ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 62a4fe419460713b9ff871feee05ceb12316f5bb9a354a97b53edfba36e95951
[INFO] running `Command { std: "docker" "start" "-a" "62a4fe419460713b9ff871feee05ceb12316f5bb9a354a97b53edfba36e95951", kill_on_drop: false }`
[INFO] [stderr]    Compiling quote v1.0.42
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]     Checking darling_core v0.20.11
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling darling_macro v0.20.11
[INFO] [stderr]     Checking darling v0.20.11
[INFO] [stderr]     Checking synonym v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 72 |     s.parse().unwrap()
[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: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:78:53
[INFO] [stdout]    |
[INFO] [stdout] 78 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]    |  _____________________________________________________^
[INFO] [stdout] 79 | |         match s.to_lowercase().as_str() {
[INFO] [stdout] 80 | |             "opaque" => Ok(DisplayKind::Opaque),
[INFO] [stdout] 81 | |             "transparent" => Ok(DisplayKind::Transparent),
[INFO] [stdout] ...  |
[INFO] [stdout] 88 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 | /         match s.to_lowercase().as_str() {
[INFO] [stdout] 80 | |             "opaque" => Ok(DisplayKind::Opaque),
[INFO] [stdout] 81 | |             "transparent" => Ok(DisplayKind::Transparent),
[INFO] [stdout] 82 | |             "uppercase" => Ok(DisplayKind::UpperCase),
[INFO] [stdout] ...  |
[INFO] [stdout] 86 | |             _ => Ok(DisplayKind::Custom(s.to_string())),
[INFO] [stdout] 87 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:80:25
[INFO] [stdout]    |
[INFO] [stdout] 80 |             "opaque" => Ok(DisplayKind::Opaque),
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:81:30
[INFO] [stdout]    |
[INFO] [stdout] 81 |             "transparent" => Ok(DisplayKind::Transparent),
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:82:28
[INFO] [stdout]    |
[INFO] [stdout] 82 |             "uppercase" => Ok(DisplayKind::UpperCase),
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:83:28
[INFO] [stdout]    |
[INFO] [stdout] 83 |             "lowercase" => Ok(DisplayKind::LowerCase),
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:84:54
[INFO] [stdout]    |
[INFO] [stdout] 84 |             "opaquelowercase" | "lowercaseopaque" => Ok(DisplayKind::OpaqueLowerCase),
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:85:54
[INFO] [stdout]    |
[INFO] [stdout] 85 |             "opaqueuppercase" | "uppercaseopaque" => Ok(DisplayKind::OpaqueUpperCase),
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:86:18
[INFO] [stdout]    |
[INFO] [stdout] 86 |             _ => Ok(DisplayKind::Custom(s.to_string())),
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `synonym` (lib) due to 10 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<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 72 |     s.parse().unwrap()
[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: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:78:53
[INFO] [stdout]    |
[INFO] [stdout] 78 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]    |  _____________________________________________________^
[INFO] [stdout] 79 | |         match s.to_lowercase().as_str() {
[INFO] [stdout] 80 | |             "opaque" => Ok(DisplayKind::Opaque),
[INFO] [stdout] 81 | |             "transparent" => Ok(DisplayKind::Transparent),
[INFO] [stdout] ...  |
[INFO] [stdout] 88 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 | /         match s.to_lowercase().as_str() {
[INFO] [stdout] 80 | |             "opaque" => Ok(DisplayKind::Opaque),
[INFO] [stdout] 81 | |             "transparent" => Ok(DisplayKind::Transparent),
[INFO] [stdout] 82 | |             "uppercase" => Ok(DisplayKind::UpperCase),
[INFO] [stdout] ...  |
[INFO] [stdout] 86 | |             _ => Ok(DisplayKind::Custom(s.to_string())),
[INFO] [stdout] 87 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:80:25
[INFO] [stdout]    |
[INFO] [stdout] 80 |             "opaque" => Ok(DisplayKind::Opaque),
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:81:30
[INFO] [stdout]    |
[INFO] [stdout] 81 |             "transparent" => Ok(DisplayKind::Transparent),
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:82:28
[INFO] [stdout]    |
[INFO] [stdout] 82 |             "uppercase" => Ok(DisplayKind::UpperCase),
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:83:28
[INFO] [stdout]    |
[INFO] [stdout] 83 |             "lowercase" => Ok(DisplayKind::LowerCase),
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:84:54
[INFO] [stdout]    |
[INFO] [stdout] 84 |             "opaquelowercase" | "lowercaseopaque" => Ok(DisplayKind::OpaqueLowerCase),
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:85:54
[INFO] [stdout]    |
[INFO] [stdout] 85 |             "opaqueuppercase" | "uppercaseopaque" => Ok(DisplayKind::OpaqueUpperCase),
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DisplayKind, Infallible>
[INFO] [stdout]   --> src/attrs.rs:86:18
[INFO] [stdout]    |
[INFO] [stdout] 86 |             _ => Ok(DisplayKind::Custom(s.to_string())),
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `synonym` (lib) due to 10 previous errors
[INFO] running `Command { std: "docker" "inspect" "62a4fe419460713b9ff871feee05ceb12316f5bb9a354a97b53edfba36e95951", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62a4fe419460713b9ff871feee05ceb12316f5bb9a354a97b53edfba36e95951", kill_on_drop: false }`
[INFO] [stdout] 62a4fe419460713b9ff871feee05ceb12316f5bb9a354a97b53edfba36e95951
