[INFO] updating cached repository LachlanHogan/chat-app-management
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/LachlanHogan/chat-app-management
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/LachlanHogan/chat-app-management" "work/ex/clippy-test-run/sources/stable/gh/LachlanHogan/chat-app-management"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/LachlanHogan/chat-app-management'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LachlanHogan/chat-app-management" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/LachlanHogan/chat-app-management"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/LachlanHogan/chat-app-management'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e3f25f8ab9d2d1d22d5d871f84a5649461ec6611
[INFO] sha for GitHub repo LachlanHogan/chat-app-management: e3f25f8ab9d2d1d22d5d871f84a5649461ec6611
[INFO] validating manifest of LachlanHogan/chat-app-management on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of LachlanHogan/chat-app-management on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing LachlanHogan/chat-app-management
[INFO] finished frobbing LachlanHogan/chat-app-management
[INFO] frobbed toml for LachlanHogan/chat-app-management written to work/ex/clippy-test-run/sources/stable/gh/LachlanHogan/chat-app-management/Cargo.toml
[INFO] started frobbing LachlanHogan/chat-app-management
[INFO] finished frobbing LachlanHogan/chat-app-management
[INFO] frobbed toml for LachlanHogan/chat-app-management written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/LachlanHogan/chat-app-management/Cargo.toml
[INFO] crate LachlanHogan/chat-app-management has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting LachlanHogan/chat-app-management against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/LachlanHogan/chat-app-management:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1f44a208e0475cd618e319a2d33d5e6f468394e924e5a7b767808717b366f0c3
[INFO] running `"docker" "start" "-a" "1f44a208e0475cd618e319a2d33d5e6f468394e924e5a7b767808717b366f0c3"`
[INFO] [stderr]     Checking uuid v0.6.3
[INFO] [stderr]     Checking mustache v0.8.2
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]     Checking dotenv v0.9.0
[INFO] [stderr]     Checking hyper v0.11.27
[INFO] [stderr]     Checking nickel v0.10.1
[INFO] [stderr]    Compiling diesel_derives v1.2.0
[INFO] [stderr]     Checking diesel v1.2.2
[INFO] [stderr]     Checking chat-app-management v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: cannot find type `table` in this scope
[INFO] [stderr]    --> <::diesel::macros::table_body macros>:165:33
[INFO] [stderr]     |
[INFO] [stderr] 165 | derive ( Debug , Clone , Copy , QueryId ) ] /// The actual table struct
[INFO] [stderr]     |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(proc_macro_derive_resolution_fallback)] on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `table` in this scope
[INFO] [stderr]    --> <::diesel::macros::table_body macros>:165:33
[INFO] [stderr]     |
[INFO] [stderr] 165 | derive ( Debug , Clone , Copy , QueryId ) ] /// The actual table struct
[INFO] [stderr]     |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `id` in this scope
[INFO] [stderr]  --> <::diesel::macros::__diesel_column macros>:5:33
[INFO] [stderr]   |
[INFO] [stderr] 5 | derive ( Debug , Clone , Copy , QueryId , Default ) ] pub struct $ column_name
[INFO] [stderr]   |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `user_id` in this scope
[INFO] [stderr]  --> <::diesel::macros::__diesel_column macros>:5:33
[INFO] [stderr]   |
[INFO] [stderr] 5 | derive ( Debug , Clone , Copy , QueryId , Default ) ] pub struct $ column_name
[INFO] [stderr]   |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `username` in this scope
[INFO] [stderr]  --> <::diesel::macros::__diesel_column macros>:5:33
[INFO] [stderr]   |
[INFO] [stderr] 5 | derive ( Debug , Clone , Copy , QueryId , Default ) ] pub struct $ column_name
[INFO] [stderr]   |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `User` in this scope
[INFO] [stderr]  --> src/models.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #[derive(Queryable, Serialize, Deserialize)]
[INFO] [stderr]   |          ^^^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `users` in this scope
[INFO] [stderr]   --> src/models.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 | #[derive(Insertable)]
[INFO] [stderr]    |          ^^^^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `NewUser` in this scope
[INFO] [stderr]   --> src/models.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 | #[derive(Insertable)]
[INFO] [stderr]    |          ^^^^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: use of `expect` followed by a function call
[INFO] [stderr]   --> src/user_management.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 |         .expect(&format!("Error connecting to {}", database_url))
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!("Error connecting to {}", database_url))`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::expect_fun_call)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `table` in this scope
[INFO] [stderr]    --> <::diesel::macros::table_body macros>:165:33
[INFO] [stderr]     |
[INFO] [stderr] 165 | derive ( Debug , Clone , Copy , QueryId ) ] /// The actual table struct
[INFO] [stderr]     |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(proc_macro_derive_resolution_fallback)] on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `table` in this scope
[INFO] [stderr]    --> <::diesel::macros::table_body macros>:165:33
[INFO] [stderr]     |
[INFO] [stderr] 165 | derive ( Debug , Clone , Copy , QueryId ) ] /// The actual table struct
[INFO] [stderr]     |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `id` in this scope
[INFO] [stderr]  --> <::diesel::macros::__diesel_column macros>:5:33
[INFO] [stderr]   |
[INFO] [stderr] 5 | derive ( Debug , Clone , Copy , QueryId , Default ) ] pub struct $ column_name
[INFO] [stderr]   |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `user_id` in this scope
[INFO] [stderr]  --> <::diesel::macros::__diesel_column macros>:5:33
[INFO] [stderr]   |
[INFO] [stderr] 5 | derive ( Debug , Clone , Copy , QueryId , Default ) ] pub struct $ column_name
[INFO] [stderr]   |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `username` in this scope
[INFO] [stderr]  --> <::diesel::macros::__diesel_column macros>:5:33
[INFO] [stderr]   |
[INFO] [stderr] 5 | derive ( Debug , Clone , Copy , QueryId , Default ) ] pub struct $ column_name
[INFO] [stderr]   |                                 ^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `User` in this scope
[INFO] [stderr]  --> src/models.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #[derive(Queryable, Serialize, Deserialize)]
[INFO] [stderr]   |          ^^^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `users` in this scope
[INFO] [stderr]   --> src/models.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 | #[derive(Insertable)]
[INFO] [stderr]    |          ^^^^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot find type `NewUser` in this scope
[INFO] [stderr]   --> src/models.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 | #[derive(Insertable)]
[INFO] [stderr]    |          ^^^^^^^^^^ names from parent modules are not accessible without an explicit import
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/user_management.rs:67:34
[INFO] [stderr]    |
[INFO] [stderr] 67 | pub fn add_user(username_string: &String) {
[INFO] [stderr]    |                                  ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:70:9
[INFO] [stderr]    |
[INFO] [stderr] 70 |     let ref uuid = Uuid::new_v4().simple().to_string();
[INFO] [stderr]    |     ----^^^^^^^^--------------------------------------- help: try: `let uuid = &Uuid::new_v4().simple().to_string();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:85:9
[INFO] [stderr]    |
[INFO] [stderr] 85 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/server.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         format!("{}", user_management::get_other_users(id_string).to_string())
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: `to_string()` is enough: `user_management::get_other_users(id_string).to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/server.rs:18:23
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut res = format!("");
[INFO] [stderr]    |                       ^^^^^^^^^^^ help: consider using .to_string(): `"".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: use of `expect` followed by a function call
[INFO] [stderr]   --> src/user_management.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 |         .expect(&format!("Error connecting to {}", database_url))
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!("Error connecting to {}", database_url))`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::expect_fun_call)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/user_management.rs:67:34
[INFO] [stderr]    |
[INFO] [stderr] 67 | pub fn add_user(username_string: &String) {
[INFO] [stderr]    |                                  ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:70:9
[INFO] [stderr]    |
[INFO] [stderr] 70 |     let ref uuid = Uuid::new_v4().simple().to_string();
[INFO] [stderr]    |     ----^^^^^^^^--------------------------------------- help: try: `let uuid = &Uuid::new_v4().simple().to_string();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/user_management.rs:85:9
[INFO] [stderr]    |
[INFO] [stderr] 85 |     let ref connection = get_database_connection();
[INFO] [stderr]    |     ----^^^^^^^^^^^^^^----------------------------- help: try: `let connection = &get_database_connection();`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/server.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         format!("{}", user_management::get_other_users(id_string).to_string())
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: `to_string()` is enough: `user_management::get_other_users(id_string).to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/server.rs:18:23
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut res = format!("");
[INFO] [stderr]    |                       ^^^^^^^^^^^ help: consider using .to_string(): `"".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 57.99s
[INFO] running `"docker" "inspect" "1f44a208e0475cd618e319a2d33d5e6f468394e924e5a7b767808717b366f0c3"`
[INFO] running `"docker" "rm" "-f" "1f44a208e0475cd618e319a2d33d5e6f468394e924e5a7b767808717b366f0c3"`
[INFO] [stdout] 1f44a208e0475cd618e319a2d33d5e6f468394e924e5a7b767808717b366f0c3