[INFO] fetching crate ley 0.0.5...
[INFO] checking ley-0.0.5 against try#4a23c45c7893f1416456144e3883cc48ea91722e for pr-82322
[INFO] extracting crate ley 0.0.5 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate ley 0.0.5 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 ley 0.0.5
[INFO] finished tweaking crates.io crate ley 0.0.5
[INFO] tweaked toml for crates.io crate ley 0.0.5 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate ley 0.0.5 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]     Blocking waiting for file lock on package cache
[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] [stdout] ff41ca1415a46cfd718b2705efc89075e75ed5252b3215e74d68d5bb7981c36d
[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" "ff41ca1415a46cfd718b2705efc89075e75ed5252b3215e74d68d5bb7981c36d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff41ca1415a46cfd718b2705efc89075e75ed5252b3215e74d68d5bb7981c36d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff41ca1415a46cfd718b2705efc89075e75ed5252b3215e74d68d5bb7981c36d", kill_on_drop: false }`
[INFO] [stdout] ff41ca1415a46cfd718b2705efc89075e75ed5252b3215e74d68d5bb7981c36d
[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] 06972044f9f364edf8358aa9a83f9699d1f8c13604e50545ee8e98ceef422e3a
[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" "06972044f9f364edf8358aa9a83f9699d1f8c13604e50545ee8e98ceef422e3a", kill_on_drop: false }`
[INFO] [stderr]     Checking ley v0.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `collections::VecDeque`
[INFO] [stdout]  --> src/main.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{collections::VecDeque, env, fs::{File, read_dir}, io::{Read, Write}, path::Path};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/fmt.rs:1:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::Display, fs::File, io::{self, Write}, path::PathBuf};
[INFO] [stdout]   |                                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/fmt.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::catch`
[INFO] [stdout]  --> src/fmt.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use super::catch;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `collections::VecDeque`
[INFO] [stdout]  --> src/main.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{collections::VecDeque, env, fs::{File, read_dir}, io::{Read, Write}, path::Path};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/fmt.rs:1:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::Display, fs::File, io::{self, Write}, path::PathBuf};
[INFO] [stdout]   |                                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/fmt.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::catch`
[INFO] [stdout]  --> src/fmt.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use super::catch;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[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/ley.rs:137:15
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout]     | |               ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:140:37
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] 139 | |                 let name = String::<'a>::parse(token_stream);
[INFO] [stdout] 140 | |                 let comment = match token_stream.next()? {
[INFO] [stdout]     | |                                     ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:145:34
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 145 | |                 let kind = match token_stream.next()? {
[INFO] [stdout]     | |                                  ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:147:29
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 147 | |                         if *token_stream.next()? != Token::OpenBrace {
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:137:15
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout]     | |               ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:160:24
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 160 | |                 while *token_stream.peek()? != CloseBrace {
[INFO] [stdout]     | |                        ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:140:37
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] 139 | |                 let name = String::<'a>::parse(token_stream);
[INFO] [stdout] 140 | |                 let comment = match token_stream.next()? {
[INFO] [stdout]     | |                                     ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:145:34
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 145 | |                 let kind = match token_stream.next()? {
[INFO] [stdout]     | |                                  ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:147:29
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 147 | |                         if *token_stream.next()? != Token::OpenBrace {
[INFO] [stdout]     | |                             ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[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/ley.rs:160:24
[INFO] [stdout]     |
[INFO] [stdout] 135 | /     pub fn parse(token_stream: &mut TokenIter<'a, '_, '_>) -> Result<Self, ParseError<'a>> {
[INFO] [stdout] 136 | |         use Token::*;
[INFO] [stdout] 137 | |         match token_stream.next()? {
[INFO] [stdout] 138 | |             Exclamation => {
[INFO] [stdout] ...   |
[INFO] [stdout] 160 | |                 while *token_stream.peek()? != CloseBrace {
[INFO] [stdout]     | |                        ^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a method that returns `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout] ...   |
[INFO] [stdout] 182 | |         }
[INFO] [stdout] 183 | |     }
[INFO] [stdout]     | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<ley::LeyLine<'_>, ParseError<'_>>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ley`
[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: aborting due to 5 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "06972044f9f364edf8358aa9a83f9699d1f8c13604e50545ee8e98ceef422e3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06972044f9f364edf8358aa9a83f9699d1f8c13604e50545ee8e98ceef422e3a", kill_on_drop: false }`
[INFO] [stdout] 06972044f9f364edf8358aa9a83f9699d1f8c13604e50545ee8e98ceef422e3a