[INFO] updating cached repository mich101mich/sudoku
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mich101mich/sudoku
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mich101mich/sudoku" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/mich101mich/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/mich101mich/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mich101mich/sudoku" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/mich101mich/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/mich101mich/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 841c7cbb38237c7394db3de6accfe51630b6265c
[INFO] sha for GitHub repo mich101mich/sudoku: 841c7cbb38237c7394db3de6accfe51630b6265c
[INFO] validating manifest of mich101mich/sudoku on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mich101mich/sudoku on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mich101mich/sudoku
[INFO] finished frobbing mich101mich/sudoku
[INFO] frobbed toml for mich101mich/sudoku written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/mich101mich/sudoku/Cargo.toml
[INFO] started frobbing mich101mich/sudoku
[INFO] finished frobbing mich101mich/sudoku
[INFO] frobbed toml for mich101mich/sudoku written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/mich101mich/sudoku/Cargo.toml
[INFO] crate mich101mich/sudoku already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mich101mich/sudoku against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-0/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/mich101mich/sudoku:/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d70845f7c83a9136040ed1f7cc29f5e34269e9476ff53bdce828f3b97c2d3d13
[INFO] running `"docker" "start" "-a" "d70845f7c83a9136040ed1f7cc29f5e34269e9476ff53bdce828f3b97c2d3d13"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling regex v1.1.4
[INFO] [stderr]    Compiling wasm-bindgen v0.2.40
[INFO] [stderr]    Compiling futures v0.1.25
[INFO] [stderr]    Compiling enum_derive v0.1.7
[INFO] [stderr]    Compiling custom_derive v0.1.7
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling env_logger v0.6.1
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.40
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.40
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.40
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.40
[INFO] [stderr]    Compiling js-sys v0.3.17
[INFO] [stderr]     Checking console_error_panic_hook v0.1.6
[INFO] [stderr]    Compiling web-sys v0.3.17
[INFO] [stderr]     Checking wasm-bindgen-futures v0.3.17
[INFO] [stderr]     Checking smithy_types v0.0.2
[INFO] [stderr]    Compiling smd_macro v0.0.2
[INFO] [stderr]     Checking smithy_core v0.0.2
[INFO] [stderr]     Checking smithy v0.0.2
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | /     smd!(
[INFO] [stderr] 27 | |         <div style="margin: 0.5cm">
[INFO] [stderr] 28 | |             Difficulty:
[INFO] [stderr] 29 | |             {if difficulty > 3 {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |         </div>
[INFO] [stderr] 49 | |     )
[INFO] [stderr]    | |_____^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | /     smd!(
[INFO] [stderr] 27 | |         <div style="margin: 0.5cm">
[INFO] [stderr] 28 | |             Difficulty:
[INFO] [stderr] 29 | |             {if difficulty > 3 {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |         </div>
[INFO] [stderr] 49 | |     )
[INFO] [stderr]    | |_____^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error: `X..` range patterns are not supported
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using the maximum value for the type: `rest..MAX`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | /     smd!(
[INFO] [stderr] 27 | |         <div style="margin: 0.5cm">
[INFO] [stderr] 28 | |             Difficulty:
[INFO] [stderr] 29 | |             {if difficulty > 3 {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |         </div>
[INFO] [stderr] 49 | |     )
[INFO] [stderr]    | |_____^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | /     smd!(
[INFO] [stderr] 27 | |         <div style="margin: 0.5cm">
[INFO] [stderr] 28 | |             Difficulty:
[INFO] [stderr] 29 | |             {if difficulty > 3 {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |         </div>
[INFO] [stderr] 49 | |     )
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Rng`, `thread_rng`
[INFO] [stderr]  --> src/lib.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |            ^^^^^^^^^^  ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | /     smd!(
[INFO] [stderr] 27 | |         <div style="margin: 0.5cm">
[INFO] [stderr] 28 | |             Difficulty:
[INFO] [stderr] 29 | |             {if difficulty > 3 {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |         </div>
[INFO] [stderr] 49 | |     )
[INFO] [stderr]    | |_____^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `rest` in this scope
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | /     smd!(
[INFO] [stderr] 27 | |         <div style="margin: 0.5cm">
[INFO] [stderr] 28 | |             Difficulty:
[INFO] [stderr] 29 | |             {if difficulty > 3 {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |         </div>
[INFO] [stderr] 49 | |     )
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stderr]   --> src/lib.rs:46:17
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 smd!({difficulty.to_string()})
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
[INFO] [stderr]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Rng`, `thread_rng`
[INFO] [stderr]  --> src/lib.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |            ^^^^^^^^^^  ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 18 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `sudoku`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 18 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `sudoku`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d70845f7c83a9136040ed1f7cc29f5e34269e9476ff53bdce828f3b97c2d3d13"`
[INFO] running `"docker" "rm" "-f" "d70845f7c83a9136040ed1f7cc29f5e34269e9476ff53bdce828f3b97c2d3d13"`
[INFO] [stdout] d70845f7c83a9136040ed1f7cc29f5e34269e9476ff53bdce828f3b97c2d3d13