[INFO] cloning repository https://github.com/AndreyElagin/maybe-db
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AndreyElagin/maybe-db" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAndreyElagin%2Fmaybe-db", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAndreyElagin%2Fmaybe-db'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c990cbbbee1cbad68cd31ceefbe7ecba723c07b2
[INFO] checking AndreyElagin/maybe-db against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAndreyElagin%2Fmaybe-db" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AndreyElagin/maybe-db on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AndreyElagin/maybe-db
[INFO] finished tweaking git repo https://github.com/AndreyElagin/maybe-db
[INFO] tweaked toml for git repo https://github.com/AndreyElagin/maybe-db written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/AndreyElagin/maybe-db already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd922b526eec96238abff550da904b1486f5e5fe6dafdce92c3ea9c9f5ba4fca
[INFO] running `Command { std: "docker" "start" "-a" "bd922b526eec96238abff550da904b1486f5e5fe6dafdce92c3ea9c9f5ba4fca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd922b526eec96238abff550da904b1486f5e5fe6dafdce92c3ea9c9f5ba4fca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd922b526eec96238abff550da904b1486f5e5fe6dafdce92c3ea9c9f5ba4fca", kill_on_drop: false }`
[INFO] [stdout] bd922b526eec96238abff550da904b1486f5e5fe6dafdce92c3ea9c9f5ba4fca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58aed38a2543e5f003124b9550062d386286175ca8950b308bd40bb8c2d39148
[INFO] running `Command { std: "docker" "start" "-a" "58aed38a2543e5f003124b9550062d386286175ca8950b308bd40bb8c2d39148", kill_on_drop: false }`
[INFO] [stderr]     Checking maybe-db v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:100:17
[INFO] [stdout]     |
[INFO] [stdout] 99  |                 todo!("doesn't work");
[INFO] [stdout]     |                 ---------------------- any code following this expression is unreachable
[INFO] [stdout] 100 |                 uname.push(self.username[i])
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 106 |                 todo!("doesn't work");
[INFO] [stdout]     |                 ---------------------- any code following this expression is unreachable
[INFO] [stdout] 107 |                 email.push(self.email[i])
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let mut uname = String::from("");
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut email = String::from("");
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ID_SIZE`
[INFO] [stdout]   --> src/main.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | const ID_SIZE: u32 = 4;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ID_OFFSET`
[INFO] [stdout]   --> src/main.rs:55:1
[INFO] [stdout]    |
[INFO] [stdout] 55 | const ID_OFFSET: u32 = 0;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `USERNAME_OFFSET`
[INFO] [stdout]   --> src/main.rs:56:1
[INFO] [stdout]    |
[INFO] [stdout] 56 | const USERNAME_OFFSET: u32 = ID_OFFSET + ID_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EMAIL_OFFSET`
[INFO] [stdout]   --> src/main.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 | const EMAIL_OFFSET: u32 = USERNAME_OFFSET + USERNAME_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ROW_SIZE`
[INFO] [stdout]   --> src/main.rs:58:1
[INFO] [stdout]    |
[INFO] [stdout] 58 | const ROW_SIZE: u32 = ID_SIZE + USERNAME_SIZE + EMAIL_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `PAGE_SIZE`
[INFO] [stdout]   --> src/main.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | const PAGE_SIZE: u32 = 4096;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `TABLE_MAX_PAGES`
[INFO] [stdout]   --> src/main.rs:61:1
[INFO] [stdout]    |
[INFO] [stdout] 61 | const TABLE_MAX_PAGES: u32 = 100;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ROWS_PER_PAGE`
[INFO] [stdout]   --> src/main.rs:62:1
[INFO] [stdout]    |
[INFO] [stdout] 62 | const ROWS_PER_PAGE: u32 = PAGE_SIZE / ROW_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `TABLE_MAX_ROWS`
[INFO] [stdout]   --> src/main.rs:63:1
[INFO] [stdout]    |
[INFO] [stdout] 63 | const TABLE_MAX_ROWS: u32 = ROWS_PER_PAGE * TABLE_MAX_PAGES;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Success`
[INFO] [stdout]   --> src/main.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     Success,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `SyntaxError`
[INFO] [stdout]   --> src/main.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |     SyntaxError,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:100:17
[INFO] [stdout]     |
[INFO] [stdout] 99  |                 todo!("doesn't work");
[INFO] [stdout]     |                 ---------------------- any code following this expression is unreachable
[INFO] [stdout] 100 |                 uname.push(self.username[i])
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 106 |                 todo!("doesn't work");
[INFO] [stdout]     |                 ---------------------- any code following this expression is unreachable
[INFO] [stdout] 107 |                 email.push(self.email[i])
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let mut uname = String::from("");
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut email = String::from("");
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ID_SIZE`
[INFO] [stdout]   --> src/main.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | const ID_SIZE: u32 = 4;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ID_OFFSET`
[INFO] [stdout]   --> src/main.rs:55:1
[INFO] [stdout]    |
[INFO] [stdout] 55 | const ID_OFFSET: u32 = 0;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `USERNAME_OFFSET`
[INFO] [stdout]   --> src/main.rs:56:1
[INFO] [stdout]    |
[INFO] [stdout] 56 | const USERNAME_OFFSET: u32 = ID_OFFSET + ID_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EMAIL_OFFSET`
[INFO] [stdout]   --> src/main.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 | const EMAIL_OFFSET: u32 = USERNAME_OFFSET + USERNAME_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ROW_SIZE`
[INFO] [stdout]   --> src/main.rs:58:1
[INFO] [stdout]    |
[INFO] [stdout] 58 | const ROW_SIZE: u32 = ID_SIZE + USERNAME_SIZE + EMAIL_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `PAGE_SIZE`
[INFO] [stdout]   --> src/main.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | const PAGE_SIZE: u32 = 4096;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `TABLE_MAX_PAGES`
[INFO] [stdout]   --> src/main.rs:61:1
[INFO] [stdout]    |
[INFO] [stdout] 61 | const TABLE_MAX_PAGES: u32 = 100;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ROWS_PER_PAGE`
[INFO] [stdout]   --> src/main.rs:62:1
[INFO] [stdout]    |
[INFO] [stdout] 62 | const ROWS_PER_PAGE: u32 = PAGE_SIZE / ROW_SIZE;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `TABLE_MAX_ROWS`
[INFO] [stdout]   --> src/main.rs:63:1
[INFO] [stdout]    |
[INFO] [stdout] 63 | const TABLE_MAX_ROWS: u32 = ROWS_PER_PAGE * TABLE_MAX_PAGES;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Success`
[INFO] [stdout]   --> src/main.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     Success,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `SyntaxError`
[INFO] [stdout]   --> src/main.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |     SyntaxError,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "58aed38a2543e5f003124b9550062d386286175ca8950b308bd40bb8c2d39148", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58aed38a2543e5f003124b9550062d386286175ca8950b308bd40bb8c2d39148", kill_on_drop: false }`
[INFO] [stdout] 58aed38a2543e5f003124b9550062d386286175ca8950b308bd40bb8c2d39148