[INFO] fetching crate evcxr_jupyter 0.8.1...
[INFO] checking evcxr_jupyter-0.8.1 against try#4a23c45c7893f1416456144e3883cc48ea91722e for pr-82322
[INFO] extracting crate evcxr_jupyter 0.8.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate evcxr_jupyter 0.8.1 on toolchain 4a23c45c7893f1416456144e3883cc48ea91722e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate evcxr_jupyter 0.8.1
[INFO] finished tweaking crates.io crate evcxr_jupyter 0.8.1
[INFO] tweaked toml for crates.io crate evcxr_jupyter 0.8.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate evcxr_jupyter 0.8.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded metadeps v1.1.2
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 912e7658aee0673d81313cb1fbc7513d7048d2c158571739b324aeb30e692d0b
[INFO] running `Command { std: "docker" "start" "-a" "912e7658aee0673d81313cb1fbc7513d7048d2c158571739b324aeb30e692d0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "912e7658aee0673d81313cb1fbc7513d7048d2c158571739b324aeb30e692d0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "912e7658aee0673d81313cb1fbc7513d7048d2c158571739b324aeb30e692d0b", kill_on_drop: false }`
[INFO] [stdout] 912e7658aee0673d81313cb1fbc7513d7048d2c158571739b324aeb30e692d0b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "-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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b0e37923d3013755db7e83c9f6736b0a776763264a16b583d893f02a839d2dd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8b0e37923d3013755db7e83c9f6736b0a776763264a16b583d893f02a839d2dd", kill_on_drop: false }`
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[INFO] [stderr]     Checking ra_ap_assists v0.0.37
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[INFO] [stdout] error[E0277]: the `?` operator can only be used in a closure that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ra_ap_assists-0.0.37/src/handlers/inline_local_variable.rs:75:17
[INFO] [stdout]     |
[INFO] [stdout] 73  |           .map(|&FileReference { range, .. }| {
[INFO] [stdout]     |  ______________-
[INFO] [stdout] 74  | |             let usage_node =
[INFO] [stdout] 75  | |                 ctx.covering_node_for_range(range).ancestors().find_map(ast::PathExpr::cast)?;
[INFO] [stdout]     | |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a closure that returns `std::result::Result<bool, _>`
[INFO] [stdout] 76  | |             let usage_parent_option = usage_node.syntax().parent().and_then(ast::Expr::cast);
[INFO] [stdout] ...   |
[INFO] [stdout] 106 | |             ))
[INFO] [stdout] 107 | |         })
[INFO] [stdout]     | |_________- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<!>>` is not implemented for `std::result::Result<bool, _>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ra_ap_assists-0.0.37/src/handlers/inline_local_variable.rs:69:26
[INFO] [stdout]     |
[INFO] [stdout] 32  |  / pub(crate) fn inline_local_variable(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
[INFO] [stdout] 33  |  |     let let_stmt = ctx.find_node_at_offset::<ast::LetStmt>()?;
[INFO] [stdout] 34  |  |     let bind_pat = match let_stmt.pat()? {
[INFO] [stdout] 35  |  |         ast::Pat::IdentPat(pat) => pat,
[INFO] [stdout] ...    |
[INFO] [stdout] 69  |  |     let wrap_in_parens = usages
[INFO] [stdout]     |  |__________________________^
[INFO] [stdout] 70  | ||         .references
[INFO] [stdout] 71  | ||         .values()
[INFO] [stdout] 72  | ||         .flatten()
[INFO] [stdout] ...   ||
[INFO] [stdout] 107 | ||         })
[INFO] [stdout] 108 | ||         .collect::<Result<Vec<_>, _>>()?;
[INFO] [stdout]     | ||________________________________________^ cannot use the `?` operator in a function that returns `std::option::Option<()>`
[INFO] [stdout] ...    |
[INFO] [stdout] 133 |  |     )
[INFO] [stdout] 134 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::result::Result<!, _>>` is not implemented for `std::option::Option<()>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ra_ap_assists`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "8b0e37923d3013755db7e83c9f6736b0a776763264a16b583d893f02a839d2dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b0e37923d3013755db7e83c9f6736b0a776763264a16b583d893f02a839d2dd", kill_on_drop: false }`
[INFO] [stdout] 8b0e37923d3013755db7e83c9f6736b0a776763264a16b583d893f02a839d2dd