[INFO] fetching crate derive_generic_visitor 1.0.0...
[INFO] checking derive_generic_visitor-1.0.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate derive_generic_visitor 1.0.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate derive_generic_visitor 1.0.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate derive_generic_visitor 1.0.0
[INFO] tweaked toml for crates.io crate derive_generic_visitor 1.0.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate derive_generic_visitor 1.0.0 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] crate crates.io crate derive_generic_visitor 1.0.0 already has a lockfile, it will not be regenerated
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 8f543c6981ddf0f04349f01c4d5750e55172a77523d54b7a4112e8f32fc31718
[INFO] running `Command { std: "docker" "start" "-a" "8f543c6981ddf0f04349f01c4d5750e55172a77523d54b7a4112e8f32fc31718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f543c6981ddf0f04349f01c4d5750e55172a77523d54b7a4112e8f32fc31718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f543c6981ddf0f04349f01c4d5750e55172a77523d54b7a4112e8f32fc31718", kill_on_drop: false }`
[INFO] [stdout] 8f543c6981ddf0f04349f01c4d5750e55172a77523d54b7a4112e8f32fc31718
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 49119f11092307bbb9febee9c7d4afee853912616292ee498ae0b650cd86fff8
[INFO] running `Command { std: "docker" "start" "-a" "49119f11092307bbb9febee9c7d4afee853912616292ee498ae0b650cd86fff8", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.90
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling convert_case v0.6.0
[INFO] [stderr]    Compiling itertools v0.13.0
[INFO] [stderr]    Compiling darling_core v0.20.10
[INFO] [stderr]    Compiling darling_macro v0.20.10
[INFO] [stderr]    Compiling darling v0.20.10
[INFO] [stderr]    Compiling derive_generic_visitor_macros v1.0.0
[INFO] [stderr]     Checking derive_generic_visitor v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: derive_generic_visitor::ControlFlow<derive_generic_visitor::Infallible, test_derive::SumVisitor>
[INFO] [stdout]   --> tests/simple.rs:43:15
[INFO] [stdout]    |
[INFO] [stdout] 43 |       let sum = (SumVisitor { sum: 0 })
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 44 | |         .visit_by_val(&foo)
[INFO] [stdout]    | |___________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `derive_generic_visitor` (test "simple") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "49119f11092307bbb9febee9c7d4afee853912616292ee498ae0b650cd86fff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49119f11092307bbb9febee9c7d4afee853912616292ee498ae0b650cd86fff8", kill_on_drop: false }`
[INFO] [stdout] 49119f11092307bbb9febee9c7d4afee853912616292ee498ae0b650cd86fff8