[INFO] cloning repository https://github.com/aadilshabier/memory_fs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aadilshabier/memory_fs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faadilshabier%2Fmemory_fs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faadilshabier%2Fmemory_fs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 263402b4a2afc8bbe59474c1872cad1e5fa3b457
[INFO] testing aadilshabier/memory_fs against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faadilshabier%2Fmemory_fs" "/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/aadilshabier/memory_fs
[INFO] finished tweaking git repo https://github.com/aadilshabier/memory_fs
[INFO] tweaked toml for git repo https://github.com/aadilshabier/memory_fs written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/aadilshabier/memory_fs on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/aadilshabier/memory_fs 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" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3fa352d24271c85e3de4fdd63037dd360b865291af56c88a1cbe81b9d99bfb02
[INFO] running `Command { std: "docker" "start" "-a" "3fa352d24271c85e3de4fdd63037dd360b865291af56c88a1cbe81b9d99bfb02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fa352d24271c85e3de4fdd63037dd360b865291af56c88a1cbe81b9d99bfb02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fa352d24271c85e3de4fdd63037dd360b865291af56c88a1cbe81b9d99bfb02", kill_on_drop: false }`
[INFO] [stdout] 3fa352d24271c85e3de4fdd63037dd360b865291af56c88a1cbe81b9d99bfb02
[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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91a678d01c2a6830d98e76159e07920c623bd45585fe355f9c7b932f2c02ffc2
[INFO] running `Command { std: "docker" "start" "-a" "91a678d01c2a6830d98e76159e07920c623bd45585fe355f9c7b932f2c02ffc2", kill_on_drop: false }`
[INFO] [stderr]    Compiling memory_fs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:303:26
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:303:40
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:307:26
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:307:40
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `E` is never constructed
[INFO] [stdout]   --> src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct E;
[INFO] [stdout]    |        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | mod lib;
[INFO] [stdout]   | ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: lib.rs is the root of this crate's library target
[INFO] [stdout]   = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]   = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:303:26
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:303:40
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:307:26
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:307:40
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `FileType` is never used
[INFO] [stdout]  --> src/lib.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum FileType {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `E` is never constructed
[INFO] [stdout]   --> src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct E;
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `file_exists`, `file_type`, `read`, `cat`, `mv`, and `cp` are never used
[INFO] [stdout]    --> src/lib.rs:54:12
[INFO] [stdout]     |
[INFO] [stdout]  45 | impl Directory {
[INFO] [stdout]     | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  54 |     pub fn file_exists(&self, filename: &str) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  85 |     pub fn file_type(&self, filename: &str) -> Option<FileType> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 235 |     pub fn read(&self, filename: &str) -> Result<Vec<u8>, Error> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 261 |     pub fn cat(&mut self, filename: &str, contents: &[u8]) -> Result<(), Error> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |            ^^
[INFO] [stdout] ...
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `Command { std: "docker" "inspect" "91a678d01c2a6830d98e76159e07920c623bd45585fe355f9c7b932f2c02ffc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91a678d01c2a6830d98e76159e07920c623bd45585fe355f9c7b932f2c02ffc2", kill_on_drop: false }`
[INFO] [stdout] 91a678d01c2a6830d98e76159e07920c623bd45585fe355f9c7b932f2c02ffc2
[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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c3bb5765b251e453c2d629a50350992904e3fea11adc5f65a595b9950d177e4
[INFO] running `Command { std: "docker" "start" "-a" "2c3bb5765b251e453c2d629a50350992904e3fea11adc5f65a595b9950d177e4", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:303:26
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:303:40
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:307:26
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:307:40
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `E` is never constructed
[INFO] [stdout]   --> src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct E;
[INFO] [stdout]    |        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling memory_fs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | mod lib;
[INFO] [stdout]   | ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: lib.rs is the root of this crate's library target
[INFO] [stdout]   = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]   = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:307:26
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:307:40
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:303:26
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:303:40
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `E` is never constructed
[INFO] [stdout]   --> src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct E;
[INFO] [stdout]    |        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:303:26
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:303:40
[INFO] [stdout]     |
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]    --> src/lib.rs:307:26
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:307:40
[INFO] [stdout]     |
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `FileType` is never used
[INFO] [stdout]  --> src/lib.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum FileType {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `E` is never constructed
[INFO] [stdout]   --> src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct E;
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `file_exists`, `file_type`, `read`, `cat`, `mv`, and `cp` are never used
[INFO] [stdout]    --> src/lib.rs:54:12
[INFO] [stdout]     |
[INFO] [stdout]  45 | impl Directory {
[INFO] [stdout]     | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  54 |     pub fn file_exists(&self, filename: &str) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  85 |     pub fn file_type(&self, filename: &str) -> Option<FileType> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 235 |     pub fn read(&self, filename: &str) -> Result<Vec<u8>, Error> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 261 |     pub fn cat(&mut self, filename: &str, contents: &[u8]) -> Result<(), Error> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |            ^^
[INFO] [stdout] ...
[INFO] [stdout] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "2c3bb5765b251e453c2d629a50350992904e3fea11adc5f65a595b9950d177e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c3bb5765b251e453c2d629a50350992904e3fea11adc5f65a595b9950d177e4", kill_on_drop: false }`
[INFO] [stdout] 2c3bb5765b251e453c2d629a50350992904e3fea11adc5f65a595b9950d177e4
[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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7d7b2856a520072ce8af00c962b55b5d2c79ae8298564e503ce63b7d7a232ef0
[INFO] running `Command { std: "docker" "start" "-a" "7d7b2856a520072ce8af00c962b55b5d2c79ae8298564e503ce63b7d7a232ef0", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `source`
[INFO] [stderr]    --> src/lib.rs:303:26
[INFO] [stderr]     |
[INFO] [stderr] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dest`
[INFO] [stderr]    --> src/lib.rs:303:40
[INFO] [stderr]     |
[INFO] [stderr] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `source`
[INFO] [stderr]    --> src/lib.rs:307:26
[INFO] [stderr]     |
[INFO] [stderr] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dest`
[INFO] [stderr]    --> src/lib.rs:307:40
[INFO] [stderr]     |
[INFO] [stderr] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stderr] 
[INFO] [stderr] warning: struct `E` is never constructed
[INFO] [stderr]   --> src/lib.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | struct E;
[INFO] [stderr]    |        ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `memory_fs` (lib) generated 5 warnings
[INFO] [stderr] warning: found module declaration for lib.rs
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | mod lib;
[INFO] [stderr]   | ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: lib.rs is the root of this crate's library target
[INFO] [stderr]   = help: to refer to it from other targets, use the library's name as the path
[INFO] [stderr]   = note: `#[warn(special_module_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum `FileType` is never used
[INFO] [stderr]  --> src/lib.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub enum FileType {
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `E` is never constructed
[INFO] [stderr]   --> src/lib.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | struct E;
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `file_exists`, `file_type`, `read`, `cat`, `mv`, and `cp` are never used
[INFO] [stderr]    --> src/lib.rs:54:12
[INFO] [stderr]     |
[INFO] [stderr]  45 | impl Directory {
[INFO] [stderr]     | -------------- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr]  54 |     pub fn file_exists(&self, filename: &str) -> bool {
[INFO] [stderr]     |            ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  85 |     pub fn file_type(&self, filename: &str) -> Option<FileType> {
[INFO] [stderr]     |            ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 235 |     pub fn read(&self, filename: &str) -> Result<Vec<u8>, Error> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 261 |     pub fn cat(&mut self, filename: &str, contents: &[u8]) -> Result<(), Error> {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |            ^^
[INFO] [stderr] ...
[INFO] [stderr] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |            ^^
[INFO] [stderr] 
[INFO] [stderr] warning: `memory_fs` (bin "memory_fs" test) generated 8 warnings (4 duplicates)
[INFO] [stderr] warning: unused variable: `source`
[INFO] [stderr]    --> src/lib.rs:307:26
[INFO] [stderr]     |
[INFO] [stderr] 307 |     pub fn cp(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `source`
[INFO] [stderr]    --> src/lib.rs:303:26
[INFO] [stderr]     |
[INFO] [stderr] 303 |     pub fn mv(&mut self, source: &str, dest: &str) -> Result<(), Error> {
[INFO] [stderr]     |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stderr] 
[INFO] [stderr] warning: `memory_fs` (lib test) generated 5 warnings (3 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/memory_fs-013bef685ab537ac)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::test_split_filename_empty ... ok
[INFO] [stdout] test tests::test_split_filename_single2 ... ok
[INFO] [stdout] test tests::test_split_filename_single3 ... ok
[INFO] [stdout] test tests::test_split_filename_single1 ... ok
[INFO] [stdout] test tests::test_split_filename_single4 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/memory_fs-259448bf6d0325f6)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stderr]    Doc-tests memory_fs
[INFO] [stdout] test lib::tests::test_split_filename_empty ... ok
[INFO] [stdout] test lib::tests::test_split_filename_single1 ... ok
[INFO] [stdout] test lib::tests::test_split_filename_single2 ... ok
[INFO] [stdout] test lib::tests::test_split_filename_single3 ... ok
[INFO] [stdout] test lib::tests::test_split_filename_single4 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7d7b2856a520072ce8af00c962b55b5d2c79ae8298564e503ce63b7d7a232ef0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d7b2856a520072ce8af00c962b55b5d2c79ae8298564e503ce63b7d7a232ef0", kill_on_drop: false }`
[INFO] [stdout] 7d7b2856a520072ce8af00c962b55b5d2c79ae8298564e503ce63b7d7a232ef0