[INFO] fetching crate mathml 0.4.4...
[INFO] checking mathml-0.4.4 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate mathml 0.4.4 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate mathml 0.4.4
[INFO] finished tweaking crates.io crate mathml 0.4.4
[INFO] tweaked toml for crates.io crate mathml 0.4.4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mathml 0.4.4 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] [stderr]       Adding approx v0.3.2 (available: v0.5.1)
[INFO] [stderr]       Adding roxmltree v0.10.1 (available: v0.21.1)
[INFO] [stderr]       Adding serde_plain v0.3.0 (available: v1.0.2)
[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] 07ad674d28b5305a66e61f9e3fe3af0e9cf3348eaa42f00c4522e6b26314df9e
[INFO] running `Command { std: "docker" "start" "-a" "07ad674d28b5305a66e61f9e3fe3af0e9cf3348eaa42f00c4522e6b26314df9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07ad674d28b5305a66e61f9e3fe3af0e9cf3348eaa42f00c4522e6b26314df9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07ad674d28b5305a66e61f9e3fe3af0e9cf3348eaa42f00c4522e6b26314df9e", kill_on_drop: false }`
[INFO] [stdout] 07ad674d28b5305a66e61f9e3fe3af0e9cf3348eaa42f00c4522e6b26314df9e
[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] 84c50249ff35beaa919ee712b96a9b5c2a761a056c35791bd3e8d62dc0bee669
[INFO] running `Command { std: "docker" "start" "-a" "84c50249ff35beaa919ee712b96a9b5c2a761a056c35791bd3e8d62dc0bee669", kill_on_drop: false }`
[INFO] [stderr]     Checking xmlparser v0.13.6
[INFO] [stderr]     Checking serde_plain v0.3.0
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking roxmltree v0.10.1
[INFO] [stderr]     Checking mathml v0.4.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]    --> src/numbers.rs:106:55
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let encoding = node.attribute("encoding").map(|p| p.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<std::string::String, Infallible>
[INFO] [stdout]    --> src/numbers.rs:107:66
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let definition_url = node.attribute("definitionUrl").map(|p| p.parse().unwrap());
[INFO] [stdout]     |                                                                  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mathml` (lib test) 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<std::string::String, Infallible>
[INFO] [stdout]    --> src/numbers.rs:106:55
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let encoding = node.attribute("encoding").map(|p| p.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<std::string::String, Infallible>
[INFO] [stdout]    --> src/numbers.rs:107:66
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let definition_url = node.attribute("definitionUrl").map(|p| p.parse().unwrap());
[INFO] [stdout]     |                                                                  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mathml` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "84c50249ff35beaa919ee712b96a9b5c2a761a056c35791bd3e8d62dc0bee669", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84c50249ff35beaa919ee712b96a9b5c2a761a056c35791bd3e8d62dc0bee669", kill_on_drop: false }`
[INFO] [stdout] 84c50249ff35beaa919ee712b96a9b5c2a761a056c35791bd3e8d62dc0bee669
