[INFO] fetching crate widestring 1.2.1...
[INFO] checking widestring-1.2.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate widestring 1.2.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate widestring 1.2.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate widestring 1.2.1
[INFO] tweaked toml for crates.io crate widestring 1.2.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate widestring 1.2.1 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate widestring 1.2.1 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2d25abf0fdf87d4e0f616f513f3d5f2ba62144d34776e99a8f5c94d5666ada3a
[INFO] running `Command { std: "docker" "start" "-a" "2d25abf0fdf87d4e0f616f513f3d5f2ba62144d34776e99a8f5c94d5666ada3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d25abf0fdf87d4e0f616f513f3d5f2ba62144d34776e99a8f5c94d5666ada3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d25abf0fdf87d4e0f616f513f3d5f2ba62144d34776e99a8f5c94d5666ada3a", kill_on_drop: false }`
[INFO] [stdout] 2d25abf0fdf87d4e0f616f513f3d5f2ba62144d34776e99a8f5c94d5666ada3a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73ba940ef3930ed8708498c5cc14a90d52a94e881ca87868bdc0fe4c9bf9a877
[INFO] running `Command { std: "docker" "start" "-a" "73ba940ef3930ed8708498c5cc14a90d52a94e881ca87868bdc0fe4c9bf9a877", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]    Compiling anyhow v1.0.81
[INFO] [stderr]    Compiling windows_x86_64_gnu v0.52.6
[INFO] [stderr]    Compiling log v0.4.21
[INFO] [stderr]     Checking widestring v1.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking aho-corasick v0.7.20
[INFO] [stderr]     Checking windows-targets v0.52.6
[INFO] [stderr]     Checking windows-sys v0.59.0
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking regex v1.7.3
[INFO] [stdout] error: this type will no longer be must used: Result<U16String, Infallible>
[INFO] [stdout]     --> src/ustring.rs:738:61
[INFO] [stdout]      |
[INFO] [stdout]  738 |               fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]      |  _____________________________________________________________^
[INFO] [stdout]  739 | |                 Ok(Self::from_str(s))
[INFO] [stdout]  740 | |             }
[INFO] [stdout]      | |_____________^
[INFO] [stdout] ...
[INFO] [stdout]  915 | / ustring_common_impl! {
[INFO] [stdout]  916 | |     /// An owned, mutable 16-bit wide string with undefined encoding.
[INFO] [stdout]  917 | |     ///
[INFO] [stdout]  918 | |     /// The string slice of a [`U16String`] is [`U16Str`].
[INFO] [stdout] ...    |
[INFO] [stdout] 1039 | |     fn into_boxed_ustr() -> {}
[INFO] [stdout] 1040 | | }
[INFO] [stdout]      | |_- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]      = note: this error originates in the macro `ustring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<U16String, Infallible>
[INFO] [stdout]     --> src/ustring.rs:739:17
[INFO] [stdout]      |
[INFO] [stdout]  739 |                   Ok(Self::from_str(s))
[INFO] [stdout]      |                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  915 | / ustring_common_impl! {
[INFO] [stdout]  916 | |     /// An owned, mutable 16-bit wide string with undefined encoding.
[INFO] [stdout]  917 | |     ///
[INFO] [stdout]  918 | |     /// The string slice of a [`U16String`] is [`U16Str`].
[INFO] [stdout] ...    |
[INFO] [stdout] 1039 | |     fn into_boxed_ustr() -> {}
[INFO] [stdout] 1040 | | }
[INFO] [stdout]      | |_- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the macro `ustring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<U32String, Infallible>
[INFO] [stdout]     --> src/ustring.rs:738:61
[INFO] [stdout]      |
[INFO] [stdout]  738 |               fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]      |  _____________________________________________________________^
[INFO] [stdout]  739 | |                 Ok(Self::from_str(s))
[INFO] [stdout]  740 | |             }
[INFO] [stdout]      | |_____________^
[INFO] [stdout] ...
[INFO] [stdout] 1042 | / ustring_common_impl! {
[INFO] [stdout] 1043 | |     /// An owned, mutable 32-bit wide string with undefined encoding.
[INFO] [stdout] 1044 | |     ///
[INFO] [stdout] 1045 | |     /// The string slice of a [`U32String`] is [`U32Str`].
[INFO] [stdout] ...    |
[INFO] [stdout] 1166 | |     fn into_boxed_ustr() -> {}
[INFO] [stdout] 1167 | | }
[INFO] [stdout]      | |_- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the macro `ustring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<U32String, Infallible>
[INFO] [stdout]     --> src/ustring.rs:739:17
[INFO] [stdout]      |
[INFO] [stdout]  739 |                   Ok(Self::from_str(s))
[INFO] [stdout]      |                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1042 | / ustring_common_impl! {
[INFO] [stdout] 1043 | |     /// An owned, mutable 32-bit wide string with undefined encoding.
[INFO] [stdout] 1044 | |     ///
[INFO] [stdout] 1045 | |     /// The string slice of a [`U32String`] is [`U32Str`].
[INFO] [stdout] ...    |
[INFO] [stdout] 1166 | |     fn into_boxed_ustr() -> {}
[INFO] [stdout] 1167 | | }
[INFO] [stdout]      | |_- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the macro `ustring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Utf16String, Infallible>
[INFO] [stdout]    --> src/utfstring.rs:608:61
[INFO] [stdout]     |
[INFO] [stdout] 608 |               fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]     |  _____________________________________________________________^
[INFO] [stdout] 609 | |                 Ok($utfstring::from_str(s))
[INFO] [stdout] 610 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] ...
[INFO] [stdout] 892 | / utfstring_common_impl! {
[INFO] [stdout] 893 | |     /// A UTF-16 encoded, growable owned string.
[INFO] [stdout] 894 | |     ///
[INFO] [stdout] 895 | |     /// [`Utf16String`] is a version of [`String`] that uses UTF-16 encoding instead of UTF-8
[INFO] [stdout] ...   |
[INFO] [stdout] 998 | |     fn as_mut_vec() -> {}
[INFO] [stdout] 999 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `utfstring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Utf16String, Infallible>
[INFO] [stdout]    --> src/utfstring.rs:609:17
[INFO] [stdout]     |
[INFO] [stdout] 609 |                   Ok($utfstring::from_str(s))
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 892 | / utfstring_common_impl! {
[INFO] [stdout] 893 | |     /// A UTF-16 encoded, growable owned string.
[INFO] [stdout] 894 | |     ///
[INFO] [stdout] 895 | |     /// [`Utf16String`] is a version of [`String`] that uses UTF-16 encoding instead of UTF-8
[INFO] [stdout] ...   |
[INFO] [stdout] 998 | |     fn as_mut_vec() -> {}
[INFO] [stdout] 999 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `utfstring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Utf32String, Infallible>
[INFO] [stdout]     --> src/utfstring.rs:608:61
[INFO] [stdout]      |
[INFO] [stdout]  608 |               fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]      |  _____________________________________________________________^
[INFO] [stdout]  609 | |                 Ok($utfstring::from_str(s))
[INFO] [stdout]  610 | |             }
[INFO] [stdout]      | |_____________^
[INFO] [stdout] ...
[INFO] [stdout] 1001 | / utfstring_common_impl! {
[INFO] [stdout] 1002 | |     /// A UTF-32 encoded, growable owned string.
[INFO] [stdout] 1003 | |     ///
[INFO] [stdout] 1004 | |     /// [`Utf32String`] is a version of [`String`] that uses UTF-32 encoding instead of UTF-8
[INFO] [stdout] ...    |
[INFO] [stdout] 1108 | |     fn as_mut_vec() -> {}
[INFO] [stdout] 1109 | | }
[INFO] [stdout]      | |_- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the macro `utfstring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Utf32String, Infallible>
[INFO] [stdout]     --> src/utfstring.rs:609:17
[INFO] [stdout]      |
[INFO] [stdout]  609 |                   Ok($utfstring::from_str(s))
[INFO] [stdout]      |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1001 | / utfstring_common_impl! {
[INFO] [stdout] 1002 | |     /// A UTF-32 encoded, growable owned string.
[INFO] [stdout] 1003 | |     ///
[INFO] [stdout] 1004 | |     /// [`Utf32String`] is a version of [`String`] that uses UTF-32 encoding instead of UTF-8
[INFO] [stdout] ...    |
[INFO] [stdout] 1108 | |     fn as_mut_vec() -> {}
[INFO] [stdout] 1109 | | }
[INFO] [stdout]      | |_- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the macro `utfstring_common_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `widestring` (lib) due to 8 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "73ba940ef3930ed8708498c5cc14a90d52a94e881ca87868bdc0fe4c9bf9a877", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73ba940ef3930ed8708498c5cc14a90d52a94e881ca87868bdc0fe4c9bf9a877", kill_on_drop: false }`
[INFO] [stdout] 73ba940ef3930ed8708498c5cc14a90d52a94e881ca87868bdc0fe4c9bf9a877
