[INFO] fetching crate rs-smtp 1.0.1...
[INFO] checking rs-smtp-1.0.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate rs-smtp 1.0.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate rs-smtp 1.0.1 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rs-smtp 1.0.1
[INFO] finished tweaking crates.io crate rs-smtp 1.0.1
[INFO] tweaked toml for crates.io crate rs-smtp 1.0.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 96 packages
[INFO] [stderr]       Adding base64 v0.21.7 (latest: v0.22.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding ring v0.16.20 (latest: v0.17.8)
[INFO] [stderr]       Adding rustls v0.20.9 (latest: v0.23.4)
[INFO] [stderr]       Adding spin v0.5.2 (latest: v0.9.8)
[INFO] [stderr]       Adding tokio-rustls v0.23.4 (latest: v0.26.0)
[INFO] [stderr]       Adding untrusted v0.7.1 (latest: v0.9.0)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f329ef6657ce72c8258ca5dced3887eef42980d4a2f2868945a57ae99c20db43
[INFO] running `Command { std: "docker" "start" "-a" "f329ef6657ce72c8258ca5dced3887eef42980d4a2f2868945a57ae99c20db43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f329ef6657ce72c8258ca5dced3887eef42980d4a2f2868945a57ae99c20db43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f329ef6657ce72c8258ca5dced3887eef42980d4a2f2868945a57ae99c20db43", kill_on_drop: false }`
[INFO] [stdout] f329ef6657ce72c8258ca5dced3887eef42980d4a2f2868945a57ae99c20db43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6a753762224a5678e053d289823d2ef30d96360c07009c8f8b30dd983085d2e4
[INFO] running `Command { std: "docker" "start" "-a" "6a753762224a5678e053d289823d2ef30d96360c07009c8f8b30dd983085d2e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking ring v0.16.20
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking rustls v0.20.9
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]    Compiling async-trait v0.1.79
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking thiserror v1.0.58
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking tokio-rustls v0.23.4
[INFO] [stderr]     Checking rs-smtp v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `future::Future`
[INFO] [stdout]  --> src/data.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{pin::Pin, future::Future, task::Poll, io::{ErrorKind, Error}};
[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/data.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::io::{self, AsyncRead, AsyncBufReadExt, AsyncBufRead, BufReader};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `future::Future`
[INFO] [stdout]  --> src/data.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{pin::Pin, future::Future, task::Poll, io::{ErrorKind, Error}};
[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/data.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::io::{self, AsyncRead, AsyncBufReadExt, AsyncBufRead, BufReader};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `enhanced_code` is never read
[INFO] [stdout]  --> src/data.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct SMTPError {
[INFO] [stdout]   |            --------- field in this struct
[INFO] [stdout] 8 |     code: u16,
[INFO] [stdout] 9 |     enhanced_code: EnhancedCode,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `err_data_too_large`, `err_auth_required`, `err_auth_unsupported`, `error`, and `is_temporary` are never used
[INFO] [stdout]   --> src/data.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl SMTPError {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 35 |     pub fn err_data_too_large() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn err_auth_required() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     pub fn err_auth_unsupported() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 59 |     pub fn error(&self) -> String {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 |     fn is_temporary(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ERR_TOO_LONG_LINE` is never used
[INFO] [stdout]  --> src/lengthlimit_reader.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | const ERR_TOO_LONG_LINE: &str = "smtp: too long a line in input stream";
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LineLimitReader` is never constructed
[INFO] [stdout]  --> src/lengthlimit_reader.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct LineLimitReader<R: AsyncRead> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `read` are never used
[INFO] [stdout]   --> src/lengthlimit_reader.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<R: AsyncRead + Unpin> LineLimitReader<R> {
[INFO] [stdout]    | --------------------------------------------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(r: R, line_limit: usize) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     async fn read(&mut self, b: &mut [u8]) -> Result<usize> {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `enhanced_code` is never read
[INFO] [stdout]  --> src/data.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct SMTPError {
[INFO] [stdout]   |            --------- field in this struct
[INFO] [stdout] 8 |     code: u16,
[INFO] [stdout] 9 |     enhanced_code: EnhancedCode,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `err_data_too_large`, `err_auth_required`, `err_auth_unsupported`, `error`, and `is_temporary` are never used
[INFO] [stdout]   --> src/data.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl SMTPError {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 35 |     pub fn err_data_too_large() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn err_auth_required() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     pub fn err_auth_unsupported() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 59 |     pub fn error(&self) -> String {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 |     fn is_temporary(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ERR_TOO_LONG_LINE` is never used
[INFO] [stdout]  --> src/lengthlimit_reader.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | const ERR_TOO_LONG_LINE: &str = "smtp: too long a line in input stream";
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LineLimitReader` is never constructed
[INFO] [stdout]  --> src/lengthlimit_reader.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct LineLimitReader<R: AsyncRead> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `read` are never used
[INFO] [stdout]   --> src/lengthlimit_reader.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<R: AsyncRead + Unpin> LineLimitReader<R> {
[INFO] [stdout]    | --------------------------------------------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(r: R, line_limit: usize) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     async fn read(&mut self, b: &mut [u8]) -> Result<usize> {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.25s
[INFO] running `Command { std: "docker" "inspect" "6a753762224a5678e053d289823d2ef30d96360c07009c8f8b30dd983085d2e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a753762224a5678e053d289823d2ef30d96360c07009c8f8b30dd983085d2e4", kill_on_drop: false }`
[INFO] [stdout] 6a753762224a5678e053d289823d2ef30d96360c07009c8f8b30dd983085d2e4