Nov 16 20:58:01.583 INFO testing lucke84/playing_around_with_rust against try#2e026d6e5d7621634147ad4c8074f1d964dbb1be for pr-55982
Nov 16 20:58:01.584 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55982/worker-4/try#2e026d6e5d7621634147ad4c8074f1d964dbb1be:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-55982/try#2e026d6e5d7621634147ad4c8074f1d964dbb1be:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +2e026d6e5d7621634147ad4c8074f1d964dbb1be-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 16 20:58:02.049 INFO [stdout] 07ae368d974c5097ad71fded6c6b8f6e2dedb62fc5096d70caaff2c8a11d0325
Nov 16 20:58:02.055 INFO running `"docker" "start" "-a" "07ae368d974c5097ad71fded6c6b8f6e2dedb62fc5096d70caaff2c8a11d0325"`
Nov 16 20:58:03.063 INFO [stderr] usermod: no changes
Nov 16 20:58:03.122 INFO [stderr]    Compiling playing_around_with_rust v0.0.1 (/source)
Nov 16 20:58:03.299 INFO [stderr] warning: unnecessary parentheses around assigned value
Nov 16 20:58:03.299 INFO [stderr]   --> src/main.rs:37:13
Nov 16 20:58:03.299 INFO [stderr]    |
Nov 16 20:58:03.299 INFO [stderr] 37 |     let j = (i = 6);                            // the value of an assignment is an empty tuple: so j has the value (), not 6
Nov 16 20:58:03.299 INFO [stderr]    |             ^^^^^^^ help: remove these parentheses
Nov 16 20:58:03.299 INFO [stderr]    |
Nov 16 20:58:03.299 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Nov 16 20:58:03.299 INFO [stderr] 
Nov 16 20:58:03.311 INFO [stderr] warning: unreachable expression
Nov 16 20:58:03.311 INFO [stderr]    --> src/main.rs:137:5
Nov 16 20:58:03.311 INFO [stderr]     |
Nov 16 20:58:03.311 INFO [stderr] 137 |     x                                           // never executed
Nov 16 20:58:03.311 INFO [stderr]     |     ^
Nov 16 20:58:03.311 INFO [stderr]     |
Nov 16 20:58:03.311 INFO [stderr]     = note: #[warn(unreachable_code)] on by default
Nov 16 20:58:03.311 INFO [stderr] 
Nov 16 20:58:03.311 INFO [stderr] warning: unused variable: `a`
Nov 16 20:58:03.311 INFO [stderr]  --> src/main.rs:7:9
Nov 16 20:58:03.311 INFO [stderr]   |
Nov 16 20:58:03.311 INFO [stderr] 7 |     let a = 1;                                  // type i32 is infered
Nov 16 20:58:03.311 INFO [stderr]   |         ^ help: consider using `_a` instead
Nov 16 20:58:03.311 INFO [stderr]   |
Nov 16 20:58:03.312 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `b`
Nov 16 20:58:03.312 INFO [stderr]  --> src/main.rs:8:9
Nov 16 20:58:03.312 INFO [stderr]   |
Nov 16 20:58:03.312 INFO [stderr] 8 |     let b: i32 = 2;                             // type i32 is explicitly declared
Nov 16 20:58:03.312 INFO [stderr]   |         ^ help: consider using `_b` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `c`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:10:10
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 10 |     let (c, d) = (3, 4);                        // variable bindings of multiple vars at the same time
Nov 16 20:58:03.312 INFO [stderr]    |          ^ help: consider using `_c` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `d`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:10:13
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 10 |     let (c, d) = (3, 4);                        // variable bindings of multiple vars at the same time
Nov 16 20:58:03.312 INFO [stderr]    |             ^ help: consider using `_d` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `e`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:12:9
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 12 |     let e: i32;
Nov 16 20:58:03.312 INFO [stderr]    |         ^ help: consider using `_e` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: variable `f` is assigned to, but never used
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:18:13
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 18 |     let mut f = 5;                              // make variable mutable
Nov 16 20:58:03.312 INFO [stderr]    |             ^
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr]    = note: consider using `_f` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: value assigned to `f` is never read
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:19:5
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 19 |     f = 6;                                      // now I can assign a new value (of the same type!) to this variable
Nov 16 20:58:03.312 INFO [stderr]    |     ^
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `f`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:20:9
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 20 |     let f = "Look, I am text now";              // shadowing, and changing type!
Nov 16 20:58:03.312 INFO [stderr]    |         ^ help: consider using `_f` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: value assigned to `i` is never read
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:36:13
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 36 |     let mut i = 5;
Nov 16 20:58:03.312 INFO [stderr]    |             ^
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `j`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:37:9
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 37 |     let j = (i = 6);                            // the value of an assignment is an empty tuple: so j has the value (), not 6
Nov 16 20:58:03.312 INFO [stderr]    |         ^ help: consider using `_j` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `a_boolean`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:59:9
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 59 |     let a_boolean = true;                         // with inference
Nov 16 20:58:03.312 INFO [stderr]    |         ^^^^^^^^^ help: consider using `_a_boolean` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `another_boolean`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:60:9
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 60 |     let another_boolean: bool = false;            // without inference
Nov 16 20:58:03.312 INFO [stderr]    |         ^^^^^^^^^^^^^^^ help: consider using `_another_boolean` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.312 INFO [stderr] warning: unused variable: `this_is_a_char`
Nov 16 20:58:03.312 INFO [stderr]   --> src/main.rs:63:9
Nov 16 20:58:03.312 INFO [stderr]    |
Nov 16 20:58:03.312 INFO [stderr] 63 |     let this_is_a_char = 'x';                    // delimited by a single quote/tick
Nov 16 20:58:03.312 INFO [stderr]    |         ^^^^^^^^^^^^^^ help: consider using `_this_is_a_char` instead
Nov 16 20:58:03.312 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `two_hearts_char`
Nov 16 20:58:03.313 INFO [stderr]   --> src/main.rs:64:9
Nov 16 20:58:03.313 INFO [stderr]    |
Nov 16 20:58:03.313 INFO [stderr] 64 |     let two_hearts_char = '💕';                   // any unicode char (due to the fact that they are UTF-32, all chars are 4 bytes instead of just 1)
Nov 16 20:58:03.313 INFO [stderr]    |         ^^^^^^^^^^^^^^^ help: consider using `_two_hearts_char` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `an_integer`
Nov 16 20:58:03.313 INFO [stderr]   --> src/main.rs:67:9
Nov 16 20:58:03.313 INFO [stderr]    |
Nov 16 20:58:03.313 INFO [stderr] 67 |     let an_integer = 42;                         // default with inference (type i32 - The 32-bit signed integer type)
Nov 16 20:58:03.313 INFO [stderr]    |         ^^^^^^^^^^ help: consider using `_an_integer` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `a_float`
Nov 16 20:58:03.313 INFO [stderr]   --> src/main.rs:68:9
Nov 16 20:58:03.313 INFO [stderr]    |
Nov 16 20:58:03.313 INFO [stderr] 68 |     let a_float = 1.0;                           // default with inference (type f64 - The 64-bit floating point type)
Nov 16 20:58:03.313 INFO [stderr]    |         ^^^^^^^ help: consider using `_a_float` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `complete_slice`
Nov 16 20:58:03.313 INFO [stderr]   --> src/main.rs:99:9
Nov 16 20:58:03.313 INFO [stderr]    |
Nov 16 20:58:03.313 INFO [stderr] 99 |     let complete_slice = &mutable_array[..];                  // [5, 7, 3, 23, 11]
Nov 16 20:58:03.313 INFO [stderr]    |         ^^^^^^^^^^^^^^ help: consider using `_complete_slice` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `partial_slice`
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:100:9
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 100 |     let partial_slice = &mutable_array[1..3];                 // [7, 4] - from item at index 1 to item at index 3 (excluded)
Nov 16 20:58:03.313 INFO [stderr]     |         ^^^^^^^^^^^^^ help: consider using `_partial_slice` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `from_item_till_end_slice`
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:101:9
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 101 |     let from_item_till_end_slice = &mutable_array[1..];       // [7, 4, 23, 11]
Nov 16 20:58:03.313 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `_from_item_till_end_slice` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `from_beginning_till_item_slice`
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:102:9
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 102 |     let from_beginning_till_item_slice = &mutable_array[..2]; // [5, 7]
Nov 16 20:58:03.313 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `_from_beginning_till_item_slice` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `tuple_one`
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:106:9
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 106 |     let tuple_one = (1, "one");
Nov 16 20:58:03.313 INFO [stderr]     |         ^^^^^^^^^ help: consider using `_tuple_one` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: value assigned to `tuple_xy` is never read
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:110:13
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 110 |     let mut tuple_xy = (0, "zero");
Nov 16 20:58:03.313 INFO [stderr]     |             ^^^^^^^^
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `tuple_second_item`
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:123:9
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 123 |     let tuple_second_item = tuple_xy.1;
Nov 16 20:58:03.313 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^ help: consider using `_tuple_second_item` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.313 INFO [stderr] warning: unused variable: `x`
Nov 16 20:58:03.313 INFO [stderr]    --> src/main.rs:135:22
Nov 16 20:58:03.313 INFO [stderr]     |
Nov 16 20:58:03.313 INFO [stderr] 135 | fn always_return_one(x: i32) -> i32 {
Nov 16 20:58:03.313 INFO [stderr]     |                      ^ help: consider using `_x` instead
Nov 16 20:58:03.313 INFO [stderr] 
Nov 16 20:58:03.319 INFO [stderr] warning: variable does not need to be mutable
Nov 16 20:58:03.319 INFO [stderr]   --> src/main.rs:87:9
Nov 16 20:58:03.319 INFO [stderr]    |
Nov 16 20:58:03.319 INFO [stderr] 87 |     let mut mutable_array = [1.5, 2.3, 3.0]; // type [f64; 3]
Nov 16 20:58:03.319 INFO [stderr]    |         ----^^^^^^^^^^^^^
Nov 16 20:58:03.319 INFO [stderr]    |         |
Nov 16 20:58:03.319 INFO [stderr]    |         help: remove this `mut`
Nov 16 20:58:03.319 INFO [stderr]    |
Nov 16 20:58:03.319 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 16 20:58:03.319 INFO [stderr] 
Nov 16 20:58:03.323 INFO [stderr] warning: function is never used: `diverges`
Nov 16 20:58:03.323 INFO [stderr]    --> src/main.rs:140:1
Nov 16 20:58:03.323 INFO [stderr]     |
Nov 16 20:58:03.323 INFO [stderr] 140 | fn diverges() -> ! {                            // defines the return type as "diverges" using the bang symbol
Nov 16 20:58:03.323 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^
Nov 16 20:58:03.323 INFO [stderr]     |
Nov 16 20:58:03.323 INFO [stderr]     = note: #[warn(dead_code)] on by default
Nov 16 20:58:03.323 INFO [stderr] 
Nov 16 20:58:03.554 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
Nov 16 20:58:03.555 INFO [stderr] su: No module specific data is present
Nov 16 20:58:04.175 INFO running `"docker" "inspect" "07ae368d974c5097ad71fded6c6b8f6e2dedb62fc5096d70caaff2c8a11d0325"`
Nov 16 20:58:04.365 INFO running `"docker" "rm" "-f" "07ae368d974c5097ad71fded6c6b8f6e2dedb62fc5096d70caaff2c8a11d0325"`
Nov 16 20:58:04.647 INFO [stdout] 07ae368d974c5097ad71fded6c6b8f6e2dedb62fc5096d70caaff2c8a11d0325
Nov 16 20:58:04.654 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55982/worker-4/try#2e026d6e5d7621634147ad4c8074f1d964dbb1be:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-55982/try#2e026d6e5d7621634147ad4c8074f1d964dbb1be:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +2e026d6e5d7621634147ad4c8074f1d964dbb1be-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 16 20:58:05.088 INFO [stdout] 8f79eae1095b623e975d60e9d11bfb927c4aa0f78b18169715a20490a10a209d
Nov 16 20:58:05.091 INFO running `"docker" "start" "-a" "8f79eae1095b623e975d60e9d11bfb927c4aa0f78b18169715a20490a10a209d"`
Nov 16 20:58:07.003 INFO [stderr] usermod: no changes
Nov 16 20:58:07.067 INFO [stderr]    Compiling playing_around_with_rust v0.0.1 (/source)
Nov 16 20:58:07.344 INFO [stderr] warning: unnecessary parentheses around assigned value
Nov 16 20:58:07.344 INFO [stderr]   --> src/main.rs:37:13
Nov 16 20:58:07.344 INFO [stderr]    |
Nov 16 20:58:07.344 INFO [stderr] 37 |     let j = (i = 6);                            // the value of an assignment is an empty tuple: so j has the value (), not 6
Nov 16 20:58:07.344 INFO [stderr]    |             ^^^^^^^ help: remove these parentheses
Nov 16 20:58:07.344 INFO [stderr]    |
Nov 16 20:58:07.344 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Nov 16 20:58:07.344 INFO [stderr] 
Nov 16 20:58:07.386 INFO [stderr] warning: unreachable expression
Nov 16 20:58:07.386 INFO [stderr]    --> src/main.rs:137:5
Nov 16 20:58:07.386 INFO [stderr]     |
Nov 16 20:58:07.386 INFO [stderr] 137 |     x                                           // never executed
Nov 16 20:58:07.386 INFO [stderr]     |     ^
Nov 16 20:58:07.386 INFO [stderr]     |
Nov 16 20:58:07.386 INFO [stderr]     = note: #[warn(unreachable_code)] on by default
Nov 16 20:58:07.386 INFO [stderr] 
Nov 16 20:58:07.388 INFO [stderr] warning: unused variable: `a`
Nov 16 20:58:07.388 INFO [stderr]  --> src/main.rs:7:9
Nov 16 20:58:07.388 INFO [stderr]   |
Nov 16 20:58:07.388 INFO [stderr] 7 |     let a = 1;                                  // type i32 is infered
Nov 16 20:58:07.388 INFO [stderr]   |         ^ help: consider using `_a` instead
Nov 16 20:58:07.388 INFO [stderr]   |
Nov 16 20:58:07.388 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Nov 16 20:58:07.389 INFO [stderr] 
Nov 16 20:58:07.389 INFO [stderr] warning: unused variable: `b`
Nov 16 20:58:07.389 INFO [stderr]  --> src/main.rs:8:9
Nov 16 20:58:07.389 INFO [stderr]   |
Nov 16 20:58:07.389 INFO [stderr] 8 |     let b: i32 = 2;                             // type i32 is explicitly declared
Nov 16 20:58:07.389 INFO [stderr]   |         ^ help: consider using `_b` instead
Nov 16 20:58:07.389 INFO [stderr] 
Nov 16 20:58:07.389 INFO [stderr] warning: unused variable: `c`
Nov 16 20:58:07.389 INFO [stderr]   --> src/main.rs:10:10
Nov 16 20:58:07.389 INFO [stderr]    |
Nov 16 20:58:07.389 INFO [stderr] 10 |     let (c, d) = (3, 4);                        // variable bindings of multiple vars at the same time
Nov 16 20:58:07.389 INFO [stderr]    |          ^ help: consider using `_c` instead
Nov 16 20:58:07.389 INFO [stderr] 
Nov 16 20:58:07.389 INFO [stderr] warning: unused variable: `d`
Nov 16 20:58:07.389 INFO [stderr]   --> src/main.rs:10:13
Nov 16 20:58:07.389 INFO [stderr]    |
Nov 16 20:58:07.389 INFO [stderr] 10 |     let (c, d) = (3, 4);                        // variable bindings of multiple vars at the same time
Nov 16 20:58:07.389 INFO [stderr]    |             ^ help: consider using `_d` instead
Nov 16 20:58:07.389 INFO [stderr] 
Nov 16 20:58:07.389 INFO [stderr] warning: unused variable: `e`
Nov 16 20:58:07.389 INFO [stderr]   --> src/main.rs:12:9
Nov 16 20:58:07.389 INFO [stderr]    |
Nov 16 20:58:07.389 INFO [stderr] 12 |     let e: i32;
Nov 16 20:58:07.389 INFO [stderr]    |         ^ help: consider using `_e` instead
Nov 16 20:58:07.392 INFO [stderr] 
Nov 16 20:58:07.392 INFO [stderr] warning: variable `f` is assigned to, but never used
Nov 16 20:58:07.392 INFO [stderr]   --> src/main.rs:18:13
Nov 16 20:58:07.392 INFO [stderr]    |
Nov 16 20:58:07.392 INFO [stderr] 18 |     let mut f = 5;                              // make variable mutable
Nov 16 20:58:07.392 INFO [stderr]    |             ^
Nov 16 20:58:07.392 INFO [stderr]    |
Nov 16 20:58:07.392 INFO [stderr]    = note: consider using `_f` instead
Nov 16 20:58:07.392 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: value assigned to `f` is never read
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:19:5
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 19 |     f = 6;                                      // now I can assign a new value (of the same type!) to this variable
Nov 16 20:58:07.395 INFO [stderr]    |     ^
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: unused variable: `f`
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:20:9
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 20 |     let f = "Look, I am text now";              // shadowing, and changing type!
Nov 16 20:58:07.395 INFO [stderr]    |         ^ help: consider using `_f` instead
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: value assigned to `i` is never read
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:36:13
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 36 |     let mut i = 5;
Nov 16 20:58:07.395 INFO [stderr]    |             ^
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: unused variable: `j`
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:37:9
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 37 |     let j = (i = 6);                            // the value of an assignment is an empty tuple: so j has the value (), not 6
Nov 16 20:58:07.395 INFO [stderr]    |         ^ help: consider using `_j` instead
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: unused variable: `a_boolean`
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:59:9
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 59 |     let a_boolean = true;                         // with inference
Nov 16 20:58:07.395 INFO [stderr]    |         ^^^^^^^^^ help: consider using `_a_boolean` instead
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: unused variable: `another_boolean`
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:60:9
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 60 |     let another_boolean: bool = false;            // without inference
Nov 16 20:58:07.395 INFO [stderr]    |         ^^^^^^^^^^^^^^^ help: consider using `_another_boolean` instead
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.395 INFO [stderr] warning: unused variable: `this_is_a_char`
Nov 16 20:58:07.395 INFO [stderr]   --> src/main.rs:63:9
Nov 16 20:58:07.395 INFO [stderr]    |
Nov 16 20:58:07.395 INFO [stderr] 63 |     let this_is_a_char = 'x';                    // delimited by a single quote/tick
Nov 16 20:58:07.395 INFO [stderr]    |         ^^^^^^^^^^^^^^ help: consider using `_this_is_a_char` instead
Nov 16 20:58:07.395 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `two_hearts_char`
Nov 16 20:58:07.396 INFO [stderr]   --> src/main.rs:64:9
Nov 16 20:58:07.396 INFO [stderr]    |
Nov 16 20:58:07.396 INFO [stderr] 64 |     let two_hearts_char = '💕';                   // any unicode char (due to the fact that they are UTF-32, all chars are 4 bytes instead of just 1)
Nov 16 20:58:07.396 INFO [stderr]    |         ^^^^^^^^^^^^^^^ help: consider using `_two_hearts_char` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `an_integer`
Nov 16 20:58:07.396 INFO [stderr]   --> src/main.rs:67:9
Nov 16 20:58:07.396 INFO [stderr]    |
Nov 16 20:58:07.396 INFO [stderr] 67 |     let an_integer = 42;                         // default with inference (type i32 - The 32-bit signed integer type)
Nov 16 20:58:07.396 INFO [stderr]    |         ^^^^^^^^^^ help: consider using `_an_integer` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `a_float`
Nov 16 20:58:07.396 INFO [stderr]   --> src/main.rs:68:9
Nov 16 20:58:07.396 INFO [stderr]    |
Nov 16 20:58:07.396 INFO [stderr] 68 |     let a_float = 1.0;                           // default with inference (type f64 - The 64-bit floating point type)
Nov 16 20:58:07.396 INFO [stderr]    |         ^^^^^^^ help: consider using `_a_float` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `complete_slice`
Nov 16 20:58:07.396 INFO [stderr]   --> src/main.rs:99:9
Nov 16 20:58:07.396 INFO [stderr]    |
Nov 16 20:58:07.396 INFO [stderr] 99 |     let complete_slice = &mutable_array[..];                  // [5, 7, 3, 23, 11]
Nov 16 20:58:07.396 INFO [stderr]    |         ^^^^^^^^^^^^^^ help: consider using `_complete_slice` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `partial_slice`
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:100:9
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 100 |     let partial_slice = &mutable_array[1..3];                 // [7, 4] - from item at index 1 to item at index 3 (excluded)
Nov 16 20:58:07.396 INFO [stderr]     |         ^^^^^^^^^^^^^ help: consider using `_partial_slice` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `from_item_till_end_slice`
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:101:9
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 101 |     let from_item_till_end_slice = &mutable_array[1..];       // [7, 4, 23, 11]
Nov 16 20:58:07.396 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `_from_item_till_end_slice` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `from_beginning_till_item_slice`
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:102:9
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 102 |     let from_beginning_till_item_slice = &mutable_array[..2]; // [5, 7]
Nov 16 20:58:07.396 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `_from_beginning_till_item_slice` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `tuple_one`
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:106:9
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 106 |     let tuple_one = (1, "one");
Nov 16 20:58:07.396 INFO [stderr]     |         ^^^^^^^^^ help: consider using `_tuple_one` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: value assigned to `tuple_xy` is never read
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:110:13
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 110 |     let mut tuple_xy = (0, "zero");
Nov 16 20:58:07.396 INFO [stderr]     |             ^^^^^^^^
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `tuple_second_item`
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:123:9
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 123 |     let tuple_second_item = tuple_xy.1;
Nov 16 20:58:07.396 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^ help: consider using `_tuple_second_item` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.396 INFO [stderr] warning: unused variable: `x`
Nov 16 20:58:07.396 INFO [stderr]    --> src/main.rs:135:22
Nov 16 20:58:07.396 INFO [stderr]     |
Nov 16 20:58:07.396 INFO [stderr] 135 | fn always_return_one(x: i32) -> i32 {
Nov 16 20:58:07.396 INFO [stderr]     |                      ^ help: consider using `_x` instead
Nov 16 20:58:07.396 INFO [stderr] 
Nov 16 20:58:07.402 INFO [stderr] warning: variable does not need to be mutable
Nov 16 20:58:07.402 INFO [stderr]   --> src/main.rs:87:9
Nov 16 20:58:07.402 INFO [stderr]    |
Nov 16 20:58:07.403 INFO [stderr] 87 |     let mut mutable_array = [1.5, 2.3, 3.0]; // type [f64; 3]
Nov 16 20:58:07.403 INFO [stderr]    |         ----^^^^^^^^^^^^^
Nov 16 20:58:07.403 INFO [stderr]    |         |
Nov 16 20:58:07.403 INFO [stderr]    |         help: remove this `mut`
Nov 16 20:58:07.403 INFO [stderr]    |
Nov 16 20:58:07.403 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 16 20:58:07.403 INFO [stderr] 
Nov 16 20:58:07.407 INFO [stderr] warning: function is never used: `diverges`
Nov 16 20:58:07.407 INFO [stderr]    --> src/main.rs:140:1
Nov 16 20:58:07.407 INFO [stderr]     |
Nov 16 20:58:07.407 INFO [stderr] 140 | fn diverges() -> ! {                            // defines the return type as "diverges" using the bang symbol
Nov 16 20:58:07.407 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^
Nov 16 20:58:07.407 INFO [stderr]     |
Nov 16 20:58:07.407 INFO [stderr]     = note: #[warn(dead_code)] on by default
Nov 16 20:58:07.407 INFO [stderr] 
Nov 16 20:58:07.843 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.79s
Nov 16 20:58:07.844 INFO [stderr] su: No module specific data is present
Nov 16 20:58:08.688 INFO running `"docker" "inspect" "8f79eae1095b623e975d60e9d11bfb927c4aa0f78b18169715a20490a10a209d"`
Nov 16 20:58:08.862 INFO running `"docker" "rm" "-f" "8f79eae1095b623e975d60e9d11bfb927c4aa0f78b18169715a20490a10a209d"`
Nov 16 20:58:09.036 INFO [stdout] 8f79eae1095b623e975d60e9d11bfb927c4aa0f78b18169715a20490a10a209d
Nov 16 20:58:09.038 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55982/worker-4/try#2e026d6e5d7621634147ad4c8074f1d964dbb1be:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-55982/try#2e026d6e5d7621634147ad4c8074f1d964dbb1be:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +2e026d6e5d7621634147ad4c8074f1d964dbb1be-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 16 20:58:09.255 INFO [stdout] 65900d148c8e25243bd7881a321d3fe336dcc8feb7b36426f691c38af85cfe36
Nov 16 20:58:09.260 INFO running `"docker" "start" "-a" "65900d148c8e25243bd7881a321d3fe336dcc8feb7b36426f691c38af85cfe36"`
Nov 16 20:58:09.789 INFO [stderr] usermod: no changes
Nov 16 20:58:09.816 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
Nov 16 20:58:09.817 INFO [stderr]      Running /target/debug/deps/playing_around_with_rust-189cb17d87c5b791
Nov 16 20:58:09.818 INFO [stdout] 
Nov 16 20:58:09.818 INFO [stdout] running 0 tests
Nov 16 20:58:09.818 INFO [stdout] 
Nov 16 20:58:09.818 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Nov 16 20:58:09.818 INFO [stdout] 
Nov 16 20:58:09.820 INFO [stderr] su: No module specific data is present
Nov 16 20:58:10.138 INFO running `"docker" "inspect" "65900d148c8e25243bd7881a321d3fe336dcc8feb7b36426f691c38af85cfe36"`
Nov 16 20:58:10.250 INFO running `"docker" "rm" "-f" "65900d148c8e25243bd7881a321d3fe336dcc8feb7b36426f691c38af85cfe36"`
Nov 16 20:58:10.375 INFO [stdout] 65900d148c8e25243bd7881a321d3fe336dcc8feb7b36426f691c38af85cfe36