[INFO] fetching crate goff 0.1.0...
[INFO] checking goff-0.1.0 against try#4a23c45c7893f1416456144e3883cc48ea91722e for pr-82322
[INFO] extracting crate goff 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate goff 0.1.0 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 goff 0.1.0
[INFO] finished tweaking crates.io crate goff 0.1.0
[INFO] tweaked toml for crates.io crate goff 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 821b467726b37786d9db204e14c0df7861df6ff0184cc747e82669d762d75524
[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" "821b467726b37786d9db204e14c0df7861df6ff0184cc747e82669d762d75524", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "821b467726b37786d9db204e14c0df7861df6ff0184cc747e82669d762d75524", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "821b467726b37786d9db204e14c0df7861df6ff0184cc747e82669d762d75524", kill_on_drop: false }`
[INFO] [stdout] 821b467726b37786d9db204e14c0df7861df6ff0184cc747e82669d762d75524
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 14580fcaef56f443feec6d31bcb0cda00f6a6815720d7569c0edb5af0be019d3
[INFO] running `Command { std: "docker" "start" "-a" "14580fcaef56f443feec6d31bcb0cda00f6a6815720d7569c0edb5af0be019d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling serde_derive v1.0.123
[INFO] [stderr]     Checking serde v1.0.123
[INFO] [stderr]     Checking goff v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:41:18
[INFO] [stdout]    |
[INFO] [stdout] 38 | /   fn next_char(&mut self) -> Result<char>
[INFO] [stdout] 39 | |   {
[INFO] [stdout] 40 | |     let ch = self.peek_char()?;
[INFO] [stdout] 41 | |     self.input = self.input.get(ch.len_utf8()..)?;
[INFO] [stdout]    | |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<char, error::Error>`
[INFO] [stdout] 42 | |     Ok(ch)
[INFO] [stdout] 43 | |   }
[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<char, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:50:20
[INFO] [stdout]    |
[INFO] [stdout] 47 | /   fn parse_bool(&mut self) -> Result<bool>
[INFO] [stdout] 48 | |   {
[INFO] [stdout] 49 | |     if self.input.starts_with("yes") {
[INFO] [stdout] 50 | |       self.input = self.input.get("yes".len()..)?;
[INFO] [stdout]    | |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<bool, error::Error>`
[INFO] [stdout] ...  |
[INFO] [stdout] 57 | |     }
[INFO] [stdout] 58 | |   }
[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, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:53:20
[INFO] [stdout]    |
[INFO] [stdout] 47 | /   fn parse_bool(&mut self) -> Result<bool>
[INFO] [stdout] 48 | |   {
[INFO] [stdout] 49 | |     if self.input.starts_with("yes") {
[INFO] [stdout] 50 | |       self.input = self.input.get("yes".len()..)?;
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |       self.input = self.input.get("no".len()..)?;
[INFO] [stdout]    | |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<bool, error::Error>`
[INFO] [stdout] ...  |
[INFO] [stdout] 57 | |     }
[INFO] [stdout] 58 | |   }
[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, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:74:24
[INFO] [stdout]    |
[INFO] [stdout] 61 | /   fn parse_unsigned<T>(&mut self) -> Result<T>
[INFO] [stdout] 62 | |     where T: AddAssign<T> + MulAssign<T> + From<u8>,
[INFO] [stdout] 63 | |   {
[INFO] [stdout] 64 | |     let mut int = match self.next_char()? {
[INFO] [stdout] ...  |
[INFO] [stdout] 74 | |           self.input = self.input.get(1..)?;
[INFO] [stdout]    | |                        ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<T, error::Error>`
[INFO] [stdout] ...  |
[INFO] [stdout] 82 | |     }
[INFO] [stdout] 83 | |   }
[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<T, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/serialize.rs:107:22
[INFO] [stdout]     |
[INFO] [stdout] 89  | /   fn parse_signed<T>(&mut self) -> Result<T>
[INFO] [stdout] 90  | |     where T: Neg<Output = T> + AddAssign<T> + MulAssign<T> + From<i8>,
[INFO] [stdout] 91  | |   {
[INFO] [stdout] 92  | |     let is_negative = self.peek_char()? == '-';
[INFO] [stdout] ...   |
[INFO] [stdout] 107 | |         self.input = self.input.get(1..)?;
[INFO] [stdout]     | |                      ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<T, error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 116 | |     }
[INFO] [stdout] 117 | |   }
[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<T, error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 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 `goff`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:41:18
[INFO] [stdout]    |
[INFO] [stdout] 38 | /   fn next_char(&mut self) -> Result<char>
[INFO] [stdout] 39 | |   {
[INFO] [stdout] 40 | |     let ch = self.peek_char()?;
[INFO] [stdout] 41 | |     self.input = self.input.get(ch.len_utf8()..)?;
[INFO] [stdout]    | |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<char, error::Error>`
[INFO] [stdout] 42 | |     Ok(ch)
[INFO] [stdout] 43 | |   }
[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<char, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:50:20
[INFO] [stdout]    |
[INFO] [stdout] 47 | /   fn parse_bool(&mut self) -> Result<bool>
[INFO] [stdout] 48 | |   {
[INFO] [stdout] 49 | |     if self.input.starts_with("yes") {
[INFO] [stdout] 50 | |       self.input = self.input.get("yes".len()..)?;
[INFO] [stdout]    | |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<bool, error::Error>`
[INFO] [stdout] ...  |
[INFO] [stdout] 57 | |     }
[INFO] [stdout] 58 | |   }
[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, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:53:20
[INFO] [stdout]    |
[INFO] [stdout] 47 | /   fn parse_bool(&mut self) -> Result<bool>
[INFO] [stdout] 48 | |   {
[INFO] [stdout] 49 | |     if self.input.starts_with("yes") {
[INFO] [stdout] 50 | |       self.input = self.input.get("yes".len()..)?;
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |       self.input = self.input.get("no".len()..)?;
[INFO] [stdout]    | |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<bool, error::Error>`
[INFO] [stdout] ...  |
[INFO] [stdout] 57 | |     }
[INFO] [stdout] 58 | |   }
[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, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/serialize.rs:74:24
[INFO] [stdout]    |
[INFO] [stdout] 61 | /   fn parse_unsigned<T>(&mut self) -> Result<T>
[INFO] [stdout] 62 | |     where T: AddAssign<T> + MulAssign<T> + From<u8>,
[INFO] [stdout] 63 | |   {
[INFO] [stdout] 64 | |     let mut int = match self.next_char()? {
[INFO] [stdout] ...  |
[INFO] [stdout] 74 | |           self.input = self.input.get(1..)?;
[INFO] [stdout]    | |                        ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<T, error::Error>`
[INFO] [stdout] ...  |
[INFO] [stdout] 82 | |     }
[INFO] [stdout] 83 | |   }
[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<T, error::Error>`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a method that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/serialize.rs:107:22
[INFO] [stdout]     |
[INFO] [stdout] 89  | /   fn parse_signed<T>(&mut self) -> Result<T>
[INFO] [stdout] 90  | |     where T: Neg<Output = T> + AddAssign<T> + MulAssign<T> + From<i8>,
[INFO] [stdout] 91  | |   {
[INFO] [stdout] 92  | |     let is_negative = self.peek_char()? == '-';
[INFO] [stdout] ...   |
[INFO] [stdout] 107 | |         self.input = self.input.get(1..)?;
[INFO] [stdout]     | |                      ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `std::result::Result<T, error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 116 | |     }
[INFO] [stdout] 117 | |   }
[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<T, error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "14580fcaef56f443feec6d31bcb0cda00f6a6815720d7569c0edb5af0be019d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14580fcaef56f443feec6d31bcb0cda00f6a6815720d7569c0edb5af0be019d3", kill_on_drop: false }`
[INFO] [stdout] 14580fcaef56f443feec6d31bcb0cda00f6a6815720d7569c0edb5af0be019d3