[INFO] cloning repository https://github.com/shubhamdixit863/rustsessions
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shubhamdixit863/rustsessions" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshubhamdixit863%2Frustsessions", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshubhamdixit863%2Frustsessions'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 20fa2232e6098795755d8f6cded0400107e38191
[INFO] checking shubhamdixit863/rustsessions 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%2Fshubhamdixit863%2Frustsessions" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shubhamdixit863/rustsessions
[INFO] finished tweaking git repo https://github.com/shubhamdixit863/rustsessions
[INFO] tweaked toml for git repo https://github.com/shubhamdixit863/rustsessions written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shubhamdixit863/rustsessions 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/shubhamdixit863/rustsessions 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking shubhamdixit863/rustsessions 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%2Fshubhamdixit863%2Frustsessions" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shubhamdixit863/rustsessions
[INFO] finished tweaking git repo https://github.com/shubhamdixit863/rustsessions
[INFO] tweaked toml for git repo https://github.com/shubhamdixit863/rustsessions written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shubhamdixit863/rustsessions 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/shubhamdixit863/rustsessions 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 08569c05db9339794fef2b777baccc17a392d86ded21394a74182070557b4bad
[INFO] running `Command { std: "docker" "start" "-a" "08569c05db9339794fef2b777baccc17a392d86ded21394a74182070557b4bad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08569c05db9339794fef2b777baccc17a392d86ded21394a74182070557b4bad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08569c05db9339794fef2b777baccc17a392d86ded21394a74182070557b4bad", kill_on_drop: false }`
[INFO] [stdout] 08569c05db9339794fef2b777baccc17a392d86ded21394a74182070557b4bad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 6739e0d492f28bee028402d650ca069f7e19cfd6e95d79e6db49cfe4598addfc
[INFO] running `Command { std: "docker" "start" "-a" "6739e0d492f28bee028402d650ca069f7e19cfd6e95d79e6db49cfe4598addfc", kill_on_drop: false }`
[INFO] [stderr]     Checking rustsessions v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Debug`, `Display`, and `Formatter`
[INFO] [stdout]  --> src/main.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display, Formatter};
[INFO] [stdout]   |                ^^^^^  ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Debug`, `Display`, and `Formatter`
[INFO] [stdout]  --> src/main.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display, Formatter};
[INFO] [stdout]   |                ^^^^^  ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:116:10
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ----^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ----^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/main.rs:116:10
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mv2`
[INFO] [stdout]    --> src/main.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 132 |     let mv2=& mut v;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_mv2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/main.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:152:9
[INFO] [stdout]     |
[INFO] [stdout] 152 |     let a="hello";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let b="hello2";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:116:10
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ----^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ----^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/main.rs:116:10
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mv2`
[INFO] [stdout]    --> src/main.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 132 |     let mv2=& mut v;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_mv2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/main.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let  mut v =vec![1,2,2,3,4];
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:152:9
[INFO] [stdout]     |
[INFO] [stdout] 152 |     let a="hello";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let b="hello2";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]    --> src/main.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn foo()->String{
[INFO] [stdout]     |    ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `modify_vec` is never used
[INFO] [stdout]    --> src/main.rs:178:4
[INFO] [stdout]     |
[INFO] [stdout] 178 | fn modify_vec(v:& mut Vec<i32>){
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `modify_str` is never used
[INFO] [stdout]    --> src/main.rs:182:4
[INFO] [stdout]     |
[INFO] [stdout] 182 | fn modify_str(v:&String){  // here we are passing the borrowed value
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]    --> src/main.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn foo()->String{
[INFO] [stdout]     |    ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `modify_vec` is never used
[INFO] [stdout]    --> src/main.rs:178:4
[INFO] [stdout]     |
[INFO] [stdout] 178 | fn modify_vec(v:& mut Vec<i32>){
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `modify_str` is never used
[INFO] [stdout]    --> src/main.rs:182:4
[INFO] [stdout]     |
[INFO] [stdout] 182 | fn modify_str(v:&String){  // here we are passing the borrowed value
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "6739e0d492f28bee028402d650ca069f7e19cfd6e95d79e6db49cfe4598addfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6739e0d492f28bee028402d650ca069f7e19cfd6e95d79e6db49cfe4598addfc", kill_on_drop: false }`
[INFO] [stdout] 6739e0d492f28bee028402d650ca069f7e19cfd6e95d79e6db49cfe4598addfc
