[INFO] cloning repository https://github.com/alishx31/student-record
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alishx31/student-record" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falishx31%2Fstudent-record", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falishx31%2Fstudent-record'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0af2f2d4b9aeda4dceb22ebcce6d6600d9c02e12
[INFO] checking alishx31/student-record against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falishx31%2Fstudent-record" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/alishx31/student-record
[INFO] finished tweaking git repo https://github.com/alishx31/student-record
[INFO] tweaked toml for git repo https://github.com/alishx31/student-record written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/alishx31/student-record 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 git repo https://github.com/alishx31/student-record 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 2bcdbfec7bbe8ea03052abcdd499b255c0e63751cbb8bfd56df193d17e1a6e1e
[INFO] running `Command { std: "docker" "start" "-a" "2bcdbfec7bbe8ea03052abcdd499b255c0e63751cbb8bfd56df193d17e1a6e1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2bcdbfec7bbe8ea03052abcdd499b255c0e63751cbb8bfd56df193d17e1a6e1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bcdbfec7bbe8ea03052abcdd499b255c0e63751cbb8bfd56df193d17e1a6e1e", kill_on_drop: false }`
[INFO] [stdout] 2bcdbfec7bbe8ea03052abcdd499b255c0e63751cbb8bfd56df193d17e1a6e1e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] cd5f4007fa4a3e299fd5a215a543a52b5dab26c4d40f6bce1d179a68d87c303d
[INFO] running `Command { std: "docker" "start" "-a" "cd5f4007fa4a3e299fd5a215a543a52b5dab26c4d40f6bce1d179a68d87c303d", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking regex-syntax v0.6.22
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking aho-corasick v0.7.15
[INFO] [stderr]     Checking regex v1.4.3
[INFO] [stderr]     Checking scan_fmt v0.2.5
[INFO] [stderr]     Checking student v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]   --> src/main.rs:58:10
[INFO] [stdout]    |
[INFO] [stdout] 58 |     while(running){
[INFO] [stdout]    |          ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 58 -     while(running){
[INFO] [stdout] 58 +     while running {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]   --> src/main.rs:58:10
[INFO] [stdout]    |
[INFO] [stdout] 58 |     while(running){
[INFO] [stdout]    |          ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 58 -     while(running){
[INFO] [stdout] 58 +     while running {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[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 `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[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 `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let name =scanln_fmt!("{}",String);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (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<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/student.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let grade =scanln_fmt!("{}",String);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::scan_fmt_help` which comes from the expansion of the macro `scanln_fmt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `student` (bin "student" test) due to 8 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `student` (bin "student") due to 8 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "cd5f4007fa4a3e299fd5a215a543a52b5dab26c4d40f6bce1d179a68d87c303d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd5f4007fa4a3e299fd5a215a543a52b5dab26c4d40f6bce1d179a68d87c303d", kill_on_drop: false }`
[INFO] [stdout] cd5f4007fa4a3e299fd5a215a543a52b5dab26c4d40f6bce1d179a68d87c303d