[INFO] fetching crate usbd-serial 0.2.2...
[INFO] checking usbd-serial-0.2.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate usbd-serial 0.2.2 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate usbd-serial 0.2.2
[INFO] finished tweaking crates.io crate usbd-serial 0.2.2
[INFO] tweaked toml for crates.io crate usbd-serial 0.2.2 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate usbd-serial 0.2.2 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 11 packages to latest compatible versions
[INFO] [stderr]       Adding embedded-hal v0.2.7 (available: v1.0.0)
[INFO] [stderr]       Adding embedded-io v0.6.1 (available: v0.7.1)
[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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 27a5597cb505cf0bc6f86113a90275bfaff4bdecb22ae3ee3d1ed97bc1b9c39c
[INFO] running `Command { std: "docker" "start" "-a" "27a5597cb505cf0bc6f86113a90275bfaff4bdecb22ae3ee3d1ed97bc1b9c39c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "27a5597cb505cf0bc6f86113a90275bfaff4bdecb22ae3ee3d1ed97bc1b9c39c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27a5597cb505cf0bc6f86113a90275bfaff4bdecb22ae3ee3d1ed97bc1b9c39c", kill_on_drop: false }`
[INFO] [stdout] 27a5597cb505cf0bc6f86113a90275bfaff4bdecb22ae3ee3d1ed97bc1b9c39c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 5ccaf5d8001277d31e7cec495b8526d2443b23da1ba81e021f6a7a37107228d1
[INFO] running `Command { std: "docker" "start" "-a" "5ccaf5d8001277d31e7cec495b8526d2443b23da1ba81e021f6a7a37107228d1", kill_on_drop: false }`
[INFO] [stderr]    Compiling portable-atomic v1.11.1
[INFO] [stderr]     Checking nb v1.1.0
[INFO] [stderr]     Checking embedded-io v0.6.1
[INFO] [stderr]     Checking heapless v0.8.0
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking usb-device v0.3.2
[INFO] [stderr]     Checking usbd-serial v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:175:9
[INFO] [stdout]     |
[INFO] [stdout] 175 | /         b.read(3, |data| {
[INFO] [stdout] 176 | |             assert_eq!(data, &DATA[0..3]);
[INFO] [stdout] 177 | |             Ok::<usize, Infallible>(3)
[INFO] [stdout] 178 | |         })
[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<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:175:26
[INFO] [stdout]     |
[INFO] [stdout] 175 |           b.read(3, |data| {
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 176 | |             assert_eq!(data, &DATA[0..3]);
[INFO] [stdout] 177 | |             Ok::<usize, Infallible>(3)
[INFO] [stdout] 178 | |         })
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:177:13
[INFO] [stdout]     |
[INFO] [stdout] 177 |             Ok::<usize, Infallible>(3)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:180:9
[INFO] [stdout]     |
[INFO] [stdout] 180 | /         b.read(1, |data| {
[INFO] [stdout] 181 | |             assert_eq!(data, &DATA[3..4]);
[INFO] [stdout] 182 | |             Ok::<usize, Infallible>(1)
[INFO] [stdout] 183 | |         })
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:180:26
[INFO] [stdout]     |
[INFO] [stdout] 180 |           b.read(1, |data| {
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 181 | |             assert_eq!(data, &DATA[3..4]);
[INFO] [stdout] 182 | |             Ok::<usize, Infallible>(1)
[INFO] [stdout] 183 | |         })
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |             Ok::<usize, Infallible>(1)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:185:9
[INFO] [stdout]     |
[INFO] [stdout] 185 | /         b.read(1, |data| {
[INFO] [stdout] 186 | |             assert_eq!(data, &[]);
[INFO] [stdout] 187 | |             Ok::<usize, Infallible>(1)
[INFO] [stdout] 188 | |         })
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:185:26
[INFO] [stdout]     |
[INFO] [stdout] 185 |           b.read(1, |data| {
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 186 | |             assert_eq!(data, &[]);
[INFO] [stdout] 187 | |             Ok::<usize, Infallible>(1)
[INFO] [stdout] 188 | |         })
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:187:13
[INFO] [stdout]     |
[INFO] [stdout] 187 |             Ok::<usize, Infallible>(1)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:208:9
[INFO] [stdout]     |
[INFO] [stdout] 208 | /         b.read(2, |data| {
[INFO] [stdout] 209 | |             assert_eq!(data, &DATA[0..2]);
[INFO] [stdout] 210 | |             Ok::<usize, Infallible>(2)
[INFO] [stdout] 211 | |         })
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:208:26
[INFO] [stdout]     |
[INFO] [stdout] 208 |           b.read(2, |data| {
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 209 | |             assert_eq!(data, &DATA[0..2]);
[INFO] [stdout] 210 | |             Ok::<usize, Infallible>(2)
[INFO] [stdout] 211 | |         })
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:210:13
[INFO] [stdout]     |
[INFO] [stdout] 210 |             Ok::<usize, Infallible>(2)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 | /         b.read(5, |data| {
[INFO] [stdout] 216 | |             assert_eq!(data, &DATA[2..7]);
[INFO] [stdout] 217 | |             Ok::<usize, Infallible>(5)
[INFO] [stdout] 218 | |         })
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:215:26
[INFO] [stdout]     |
[INFO] [stdout] 215 |           b.read(5, |data| {
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 216 | |             assert_eq!(data, &DATA[2..7]);
[INFO] [stdout] 217 | |             Ok::<usize, Infallible>(5)
[INFO] [stdout] 218 | |         })
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/buffer.rs:217:13
[INFO] [stdout]     |
[INFO] [stdout] 217 |             Ok::<usize, Infallible>(5)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `usbd-serial` (lib test) due to 15 previous errors
[INFO] running `Command { std: "docker" "inspect" "5ccaf5d8001277d31e7cec495b8526d2443b23da1ba81e021f6a7a37107228d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ccaf5d8001277d31e7cec495b8526d2443b23da1ba81e021f6a7a37107228d1", kill_on_drop: false }`
[INFO] [stdout] 5ccaf5d8001277d31e7cec495b8526d2443b23da1ba81e021f6a7a37107228d1
