[INFO] cloning repository https://github.com/jackgerrits/reductionml
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jackgerrits/reductionml" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjackgerrits%2Freductionml", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 09929f3d2bc94ecfb6ef707cd04136aec91aa467
[INFO] checking jackgerrits/reductionml against try#94382f34384023f3d2062a34ccf0bb6b4d44a75a for mutual-coercion
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjackgerrits%2Freductionml" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jackgerrits/reductionml
[INFO] finished tweaking git repo https://github.com/jackgerrits/reductionml
[INFO] tweaked toml for git repo https://github.com/jackgerrits/reductionml written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jackgerrits/reductionml on toolchain 94382f34384023f3d2062a34ccf0bb6b4d44a75a
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[INFO] crate git repo https://github.com/jackgerrits/reductionml 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" "+94382f34384023f3d2062a34ccf0bb6b4d44a75a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stdout] error[E0308]: `?` operator has incompatible types
[INFO] [stdout]    --> reductionml-core/src/reduction.rs:289:1
[INFO] [stdout]     |
[INFO] [stdout] 289 | #[typetag::serde(tag = "type")]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected trait `ReductionImpl + Send`, found trait `ReductionImpl`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `?` operator cannot convert from `Box<dyn ReductionImpl + Send>` to `Box<dyn ReductionImpl>`
[INFO] [stdout]     = note: expected struct `Box<dyn ReductionImpl>`
[INFO] [stdout]                found struct `Box<dyn ReductionImpl + Send>`
[INFO] [stdout]     = note: this error originates in the attribute macro `typetag::serde` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `reductionml-core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0308]: `?` operator has incompatible types
[INFO] [stdout]    --> reductionml-core/src/reduction.rs:289:1
[INFO] [stdout]     |
[INFO] [stdout] 289 | #[typetag::serde(tag = "type")]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected trait `reduction::ReductionImpl + Send`, found trait `reduction::ReductionImpl`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `?` operator cannot convert from `Box<dyn reduction::ReductionImpl + Send>` to `Box<dyn reduction::ReductionImpl>`
[INFO] [stdout]     = note: expected struct `Box<dyn reduction::ReductionImpl>`
[INFO] [stdout]                found struct `Box<dyn reduction::ReductionImpl + Send>`
[INFO] [stdout]     = note: this error originates in the attribute macro `typetag::serde` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `reductionml-core` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "8d485fd26143283b9665e9928057ad23bf0e76e255a8cc99e1681ed99a846cb4", kill_on_drop: false }`
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