[INFO] cloning repository https://github.com/brianjiang2200/grade_tracker
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/brianjiang2200/grade_tracker" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianjiang2200%2Fgrade_tracker", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianjiang2200%2Fgrade_tracker'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7add867383501a4a8f1bd572c551973c1702e09b
[INFO] testing brianjiang2200/grade_tracker against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianjiang2200%2Fgrade_tracker" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/brianjiang2200/grade_tracker on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/brianjiang2200/grade_tracker
[INFO] finished tweaking git repo https://github.com/brianjiang2200/grade_tracker
[INFO] tweaked toml for git repo https://github.com/brianjiang2200/grade_tracker written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/brianjiang2200/grade_tracker already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 076eaddb9d06d35ffd686afee93eaa7e7a54b2a9d0fb060f3636a82b0152e3b1
[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" "076eaddb9d06d35ffd686afee93eaa7e7a54b2a9d0fb060f3636a82b0152e3b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "076eaddb9d06d35ffd686afee93eaa7e7a54b2a9d0fb060f3636a82b0152e3b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "076eaddb9d06d35ffd686afee93eaa7e7a54b2a9d0fb060f3636a82b0152e3b1", kill_on_drop: false }`
[INFO] [stdout] 076eaddb9d06d35ffd686afee93eaa7e7a54b2a9d0fb060f3636a82b0152e3b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8fe8281eaf9d36edb736ab02bbcbcda09ddc18c06442d7f116d5b42798cb24ce
[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" "8fe8281eaf9d36edb736ab02bbcbcda09ddc18c06442d7f116d5b42798cb24ce", kill_on_drop: false }`
[INFO] [stderr]    Compiling json v0.12.0
[INFO] [stderr]    Compiling serde_derive v1.0.103
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling serde_json v1.0.44
[INFO] [stderr]    Compiling grade_tracker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]   --> src/courses.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 | use serde::{Serialize, Deserialize}; 
[INFO] [stdout]    |             ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Summative`
[INFO] [stdout]   --> src/courses.rs:23:31
[INFO] [stdout]    |
[INFO] [stdout] 23 | use crate::jsondata::{Course, Summative}; 
[INFO] [stdout]    |                               ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]   --> src/summative.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::fs::File;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]   --> src/summative.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 | use serde::{Serialize, Deserialize}; 
[INFO] [stdout]    |             ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/courses.rs:41:62
[INFO] [stdout]    |
[INFO] [stdout] 41 |             Err(why) => panic!("couldn't create {}: {}", display, why.description()),
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/courses.rs:54:65
[INFO] [stdout]    |
[INFO] [stdout] 54 |             Err(why) => panic!("Couldn't write to {}: {}.", display, why.description()), 
[INFO] [stdout]    |                                                                          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/summative.rs:91:82
[INFO] [stdout]    |
[INFO] [stdout] 91 |                 Err(why) => panic!("Could not write summative information to file...{}", why.description()), 
[INFO] [stdout]    |                                                                                              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/summative.rs:175:83
[INFO] [stdout]     |
[INFO] [stdout] 175 |                     Err(why) => panic!("Could not write summative information to file...{}", why.description()),
[INFO] [stdout]     |                                                                                                  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/summative.rs:258:83
[INFO] [stdout]     |
[INFO] [stdout] 258 |                     Err(why) => panic!("Could not write summative information to file...{}", why.description()),
[INFO] [stdout]     |                                                                                                  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index` is never read
[INFO] [stdout]    --> src/summative.rs:126:7
[INFO] [stdout]     |
[INFO] [stdout] 126 |         let mut index = 0; 
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index` is never read
[INFO] [stdout]    --> src/summative.rs:214:7
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut index = 0; 
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index` is never read
[INFO] [stdout]    --> src/summative.rs:350:7
[INFO] [stdout]     |
[INFO] [stdout] 350 |         let mut index = 0; 
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.01s
[INFO] running `Command { std: "docker" "inspect" "8fe8281eaf9d36edb736ab02bbcbcda09ddc18c06442d7f116d5b42798cb24ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fe8281eaf9d36edb736ab02bbcbcda09ddc18c06442d7f116d5b42798cb24ce", kill_on_drop: false }`
[INFO] [stdout] 8fe8281eaf9d36edb736ab02bbcbcda09ddc18c06442d7f116d5b42798cb24ce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ea9367494ed47282e3007755bc1b8fb06f74c49e443fff9ece11d36cd79d499
[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" "2ea9367494ed47282e3007755bc1b8fb06f74c49e443fff9ece11d36cd79d499", kill_on_drop: false }`
[INFO] [stderr]    Compiling grade_tracker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]   --> src/courses.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 | use serde::{Serialize, Deserialize}; 
[INFO] [stdout]    |             ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Summative`
[INFO] [stdout]   --> src/courses.rs:23:31
[INFO] [stdout]    |
[INFO] [stdout] 23 | use crate::jsondata::{Course, Summative}; 
[INFO] [stdout]    |                               ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]   --> src/summative.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::fs::File;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]   --> src/summative.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 | use serde::{Serialize, Deserialize}; 
[INFO] [stdout]    |             ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/courses.rs:41:62
[INFO] [stdout]    |
[INFO] [stdout] 41 |             Err(why) => panic!("couldn't create {}: {}", display, why.description()),
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/courses.rs:54:65
[INFO] [stdout]    |
[INFO] [stdout] 54 |             Err(why) => panic!("Couldn't write to {}: {}.", display, why.description()), 
[INFO] [stdout]    |                                                                          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/summative.rs:91:82
[INFO] [stdout]    |
[INFO] [stdout] 91 |                 Err(why) => panic!("Could not write summative information to file...{}", why.description()), 
[INFO] [stdout]    |                                                                                              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/summative.rs:175:83
[INFO] [stdout]     |
[INFO] [stdout] 175 |                     Err(why) => panic!("Could not write summative information to file...{}", why.description()),
[INFO] [stdout]     |                                                                                                  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/summative.rs:258:83
[INFO] [stdout]     |
[INFO] [stdout] 258 |                     Err(why) => panic!("Could not write summative information to file...{}", why.description()),
[INFO] [stdout]     |                                                                                                  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index` is never read
[INFO] [stdout]    --> src/summative.rs:126:7
[INFO] [stdout]     |
[INFO] [stdout] 126 |         let mut index = 0; 
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index` is never read
[INFO] [stdout]    --> src/summative.rs:214:7
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut index = 0; 
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index` is never read
[INFO] [stdout]    --> src/summative.rs:350:7
[INFO] [stdout]     |
[INFO] [stdout] 350 |         let mut index = 0; 
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.64s
[INFO] running `Command { std: "docker" "inspect" "2ea9367494ed47282e3007755bc1b8fb06f74c49e443fff9ece11d36cd79d499", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ea9367494ed47282e3007755bc1b8fb06f74c49e443fff9ece11d36cd79d499", kill_on_drop: false }`
[INFO] [stdout] 2ea9367494ed47282e3007755bc1b8fb06f74c49e443fff9ece11d36cd79d499
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 70e4a4e7f13b086d4879fc7c61f94e38f115fcb87ae7e533a926b278a52b5638
[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" "70e4a4e7f13b086d4879fc7c61f94e38f115fcb87ae7e533a926b278a52b5638", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stderr]   --> src/courses.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 | use serde::{Serialize, Deserialize}; 
[INFO] [stderr]    |             ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Summative`
[INFO] [stderr]   --> src/courses.rs:23:31
[INFO] [stderr]    |
[INFO] [stderr] 23 | use crate::jsondata::{Course, Summative}; 
[INFO] [stderr]    |                               ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]   --> src/summative.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use std::fs::File;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stderr]   --> src/summative.rs:21:13
[INFO] [stderr]    |
[INFO] [stderr] 21 | use serde::{Serialize, Deserialize}; 
[INFO] [stderr]    |             ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/courses.rs:41:62
[INFO] [stderr]    |
[INFO] [stderr] 41 |             Err(why) => panic!("couldn't create {}: {}", display, why.description()),
[INFO] [stderr]    |                                                                       ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/courses.rs:54:65
[INFO] [stderr]    |
[INFO] [stderr] 54 |             Err(why) => panic!("Couldn't write to {}: {}.", display, why.description()), 
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/summative.rs:91:82
[INFO] [stderr]    |
[INFO] [stderr] 91 |                 Err(why) => panic!("Could not write summative information to file...{}", why.description()), 
[INFO] [stderr]    |                                                                                              ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]    --> src/summative.rs:175:83
[INFO] [stderr]     |
[INFO] [stderr] 175 |                     Err(why) => panic!("Could not write summative information to file...{}", why.description()),
[INFO] [stderr]     |                                                                                                  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]    --> src/summative.rs:258:83
[INFO] [stderr]     |
[INFO] [stderr] 258 |                     Err(why) => panic!("Could not write summative information to file...{}", why.description()),
[INFO] [stderr]     |                                                                                                  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `index` is never read
[INFO] [stderr]    --> src/summative.rs:126:7
[INFO] [stderr]     |
[INFO] [stderr] 126 |         let mut index = 0; 
[INFO] [stderr]     |             ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `index` is never read
[INFO] [stderr]    --> src/summative.rs:214:7
[INFO] [stderr]     |
[INFO] [stderr] 214 |         let mut index = 0; 
[INFO] [stderr]     |             ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `index` is never read
[INFO] [stderr]    --> src/summative.rs:350:7
[INFO] [stderr]     |
[INFO] [stderr] 350 |         let mut index = 0; 
[INFO] [stderr]     |             ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.14s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/grade_tracker-69a1c1c54bdbb5f9
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "70e4a4e7f13b086d4879fc7c61f94e38f115fcb87ae7e533a926b278a52b5638", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70e4a4e7f13b086d4879fc7c61f94e38f115fcb87ae7e533a926b278a52b5638", kill_on_drop: false }`
[INFO] [stdout] 70e4a4e7f13b086d4879fc7c61f94e38f115fcb87ae7e533a926b278a52b5638
