[INFO] fetching crate jsonml 0.4.2...
[INFO] checking jsonml-0.4.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate jsonml 0.4.2 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate jsonml 0.4.2
[INFO] finished tweaking crates.io crate jsonml 0.4.2
[INFO] tweaked toml for crates.io crate jsonml 0.4.2 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate jsonml 0.4.2 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 15 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-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] 8c064e8308699a78d2bb2417dffee1e51383f2d597b6c2642c3f2702fa566918
[INFO] running `Command { std: "docker" "start" "-a" "8c064e8308699a78d2bb2417dffee1e51383f2d597b6c2642c3f2702fa566918", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c064e8308699a78d2bb2417dffee1e51383f2d597b6c2642c3f2702fa566918", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c064e8308699a78d2bb2417dffee1e51383f2d597b6c2642c3f2702fa566918", kill_on_drop: false }`
[INFO] [stdout] 8c064e8308699a78d2bb2417dffee1e51383f2d597b6c2642c3f2702fa566918
[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] cd792a29cde11e7ff28d0a9f63ae060c624bccb7d9f454756e93936b570e6f05
[INFO] running `Command { std: "docker" "start" "-a" "cd792a29cde11e7ff28d0a9f63ae060c624bccb7d9f454756e93936b570e6f05", kill_on_drop: false }`
[INFO] [stderr]     Checking html-escape v0.2.13
[INFO] [stderr]     Checking serde_test v1.0.177
[INFO] [stderr]     Checking jsonml v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<Element, Void>
[INFO] [stdout]    --> src/lib.rs:168:53
[INFO] [stdout]     |
[INFO] [stdout] 168 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]     |  _____________________________________________________^
[INFO] [stdout] 169 | |         Ok(Element::String(s.to_string()))
[INFO] [stdout] 170 | |     }
[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<Element, Void>
[INFO] [stdout]    --> src/lib.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |         Ok(Element::String(s.to_string()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Element, Void>
[INFO] [stdout]    --> src/lib.rs:168:53
[INFO] [stdout]     |
[INFO] [stdout] 168 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]     |  _____________________________________________________^
[INFO] [stdout] 169 | |         Ok(Element::String(s.to_string()))
[INFO] [stdout] 170 | |     }
[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<Element, Void>
[INFO] [stdout]    --> src/lib.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |         Ok(Element::String(s.to_string()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `jsonml` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `jsonml` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "cd792a29cde11e7ff28d0a9f63ae060c624bccb7d9f454756e93936b570e6f05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd792a29cde11e7ff28d0a9f63ae060c624bccb7d9f454756e93936b570e6f05", kill_on_drop: false }`
[INFO] [stdout] cd792a29cde11e7ff28d0a9f63ae060c624bccb7d9f454756e93936b570e6f05