[INFO] crate off_blockway 0.0.8 is already in cache
[INFO] extracting crate off_blockway 0.0.8 into work/ex/clippy-test-run/sources/stable/reg/off_blockway/0.0.8
[INFO] extracting crate off_blockway 0.0.8 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/off_blockway/0.0.8
[INFO] validating manifest of off_blockway-0.0.8 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 off_blockway-0.0.8 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 off_blockway-0.0.8
[INFO] finished frobbing off_blockway-0.0.8
[INFO] frobbed toml for off_blockway-0.0.8 written to work/ex/clippy-test-run/sources/stable/reg/off_blockway/0.0.8/Cargo.toml
[INFO] started frobbing off_blockway-0.0.8
[INFO] finished frobbing off_blockway-0.0.8
[INFO] frobbed toml for off_blockway-0.0.8 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/off_blockway/0.0.8/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 off_blockway-0.0.8 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/off_blockway/0.0.8:/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] ac17e74ed7008e8442fa57fe4682da3c4cfca5ae878475796a285d5fa681b033
[INFO] running `"docker" "start" "-a" "ac17e74ed7008e8442fa57fe4682da3c4cfca5ae878475796a285d5fa681b033"`
[INFO] [stderr]     Checking sha3 v0.6.0
[INFO] [stderr]     Checking off_blockway v0.0.8 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/tree.rs:92:13
[INFO] [stderr]    |
[INFO] [stderr] 92 |             value: value
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/block.rs:70:13
[INFO] [stderr]    |
[INFO] [stderr] 70 |             index: index,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `index`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/block.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |             merkle_root: merkle_root,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `merkle_root`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/merkle.rs:163:17
[INFO] [stderr]     |
[INFO] [stderr] 163 |                 nodes: nodes,
[INFO] [stderr]     |                 ^^^^^^^^^^^^ help: replace it with: `nodes`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/proof.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |             value: value,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `value`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/proof.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |             hash: hash,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `hash`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/proof.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             path: path
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `path`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |             uid: uid,
[INFO] [stderr]    |             ^^^^^^^^ help: replace it with: `uid`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |             username: username,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `username`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |             content: content,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ help: replace it with: `content`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |             timestamp: timestamp,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `timestamp`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |             status: status
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `status`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/tree.rs:92:13
[INFO] [stderr]    |
[INFO] [stderr] 92 |             value: value
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/block.rs:70:13
[INFO] [stderr]    |
[INFO] [stderr] 70 |             index: index,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `index`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/block.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |             merkle_root: merkle_root,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `merkle_root`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/merkle.rs:163:17
[INFO] [stderr]     |
[INFO] [stderr] 163 |                 nodes: nodes,
[INFO] [stderr]     |                 ^^^^^^^^^^^^ help: replace it with: `nodes`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/proof.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |             value: value,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `value`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/proof.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |             hash: hash,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `hash`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/proof.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             path: path
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `path`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |             uid: uid,
[INFO] [stderr]    |             ^^^^^^^^ help: replace it with: `uid`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |             username: username,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `username`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |             content: content,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ help: replace it with: `content`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |             timestamp: timestamp,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `timestamp`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/transaction.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |             status: status
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `status`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/block.rs:80:9
[INFO] [stderr]    |
[INFO] [stderr] 80 |         return block;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `block`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/block.rs:92:9
[INFO] [stderr]    |
[INFO] [stderr] 92 |         return block;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `block`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/block.rs:140:13
[INFO] [stderr]     |
[INFO] [stderr] 140 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: Consider removing unnecessary double parentheses
[INFO] [stderr]    --> src/block.rs:140:13
[INFO] [stderr]     |
[INFO] [stderr] 140 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::double_parens)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/merkle.rs:516:13
[INFO] [stderr]     |
[INFO] [stderr] 516 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: Consider removing unnecessary double parentheses
[INFO] [stderr]    --> src/merkle.rs:516:13
[INFO] [stderr]     |
[INFO] [stderr] 516 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/merkle.rs:647:9
[INFO] [stderr]     |
[INFO] [stderr] 647 |         return -1;
[INFO] [stderr]     |         ^^^^^^^^^^ help: remove `return` as shown: `-1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/chain.rs:71:9
[INFO] [stderr]    |
[INFO] [stderr] 71 |         return chain;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `chain`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/chain.rs:120:9
[INFO] [stderr]     |
[INFO] [stderr] 120 |         return self.chain.len();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `self.chain.len()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/chain.rs:171:9
[INFO] [stderr]     |
[INFO] [stderr] 171 |         return false;
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/block.rs:80:9
[INFO] [stderr]    |
[INFO] [stderr] 80 |         return block;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `block`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/block.rs:92:9
[INFO] [stderr]    |
[INFO] [stderr] 92 |         return block;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `block`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/block.rs:140:13
[INFO] [stderr]     |
[INFO] [stderr] 140 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: Consider removing unnecessary double parentheses
[INFO] [stderr]    --> src/block.rs:140:13
[INFO] [stderr]     |
[INFO] [stderr] 140 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::double_parens)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/merkle.rs:516:13
[INFO] [stderr]     |
[INFO] [stderr] 516 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: Consider removing unnecessary double parentheses
[INFO] [stderr]    --> src/merkle.rs:516:13
[INFO] [stderr]     |
[INFO] [stderr] 516 |         Ok( ( json ) )
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/merkle.rs:647:9
[INFO] [stderr]     |
[INFO] [stderr] 647 |         return -1;
[INFO] [stderr]     |         ^^^^^^^^^^ help: remove `return` as shown: `-1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/chain.rs:71:9
[INFO] [stderr]    |
[INFO] [stderr] 71 |         return chain;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `chain`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/chain.rs:120:9
[INFO] [stderr]     |
[INFO] [stderr] 120 |         return self.chain.len();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `self.chain.len()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/chain.rs:171:9
[INFO] [stderr]     |
[INFO] [stderr] 171 |         return false;
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error: useless lint attribute
[INFO] [stderr]  --> src/block.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[allow(dead_code)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![allow(dead_code)]`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[deny(clippy::useless_attribute)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_attribute
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/block.rs:204:48
[INFO] [stderr]     |
[INFO] [stderr] 204 |     pub fn set_previous_hash( &mut self, hash: &String )
[INFO] [stderr]     |                                                ^^^^^^^
[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] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 204 |     pub fn set_previous_hash( &mut self, hash: &str )
[INFO] [stderr]     |                                                ^^^^
[INFO] [stderr] help: change `hash.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 208 |         self.previous_hash = hash.to_string();
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:274:39
[INFO] [stderr]     |
[INFO] [stderr] 274 |                     let current_row = self.map.get( &current_level ).unwrap();
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&current_level]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:312:25
[INFO] [stderr]     |
[INFO] [stderr] 312 |             self.root = self.map.get( &0 ).unwrap()[ 0 ].clone();
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&0]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:403:37
[INFO] [stderr]     |
[INFO] [stderr] 403 |                 let current_nodes = self.map.get( &current_level ).unwrap();
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&current_level]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:627:28
[INFO] [stderr]     |
[INFO] [stderr] 627 |         let target_level = self.map.get( &level ).unwrap();
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&level]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is used to index `target_level`
[INFO] [stderr]    --> src/merkle.rs:629:18
[INFO] [stderr]     |
[INFO] [stderr] 629 |         for i in 0 .. target_level.len()
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 629 |         for (i, <item>) in target_level.iter().enumerate()
[INFO] [stderr]     |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:659:28
[INFO] [stderr]     |
[INFO] [stderr] 659 |         let target_level = self.map.get( &level ).unwrap();
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&level]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is only used to index `target_level`.
[INFO] [stderr]    --> src/merkle.rs:661:18
[INFO] [stderr]     |
[INFO] [stderr] 661 |         for i in 0 .. target_level.len() 
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 661 |         for <item> in &target_level 
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/proof.rs:68:33
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn verify( &self, root: &String ) -> bool
[INFO] [stderr]    |                                 ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/proof.rs:81:20
[INFO] [stderr]    |
[INFO] [stderr] 81 |               hash = match instance
[INFO] [stderr]    |  ____________________^
[INFO] [stderr] 82 | |             {
[INFO] [stderr] 83 | |
[INFO] [stderr] 84 | |                 &Node::Left( ref proof ) => ::hash_util::create_node_hash( proof, &hash ),
[INFO] [stderr] 85 | |                 &Node::Right( ref proof ) => ::hash_util::create_node_hash( &hash, proof ),
[INFO] [stderr] 86 | |                 
[INFO] [stderr] 87 | |             };
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 81 |             hash = match *instance
[INFO] [stderr] 82 |             {
[INFO] [stderr] 83 | 
[INFO] [stderr] 84 |                 Node::Left( ref proof ) => ::hash_util::create_node_hash( proof, &hash ),
[INFO] [stderr] 85 |                 Node::Right( ref proof ) => ::hash_util::create_node_hash( &hash, proof ),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: item `chain::Chain` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/chain.rs:51:1
[INFO] [stderr]     |
[INFO] [stderr] 51  | / impl Chain
[INFO] [stderr] 52  | | {
[INFO] [stderr] 53  | |
[INFO] [stderr] 54  | |     // Constructor for a new chain
[INFO] [stderr] ...   |
[INFO] [stderr] 234 | |     
[INFO] [stderr] 235 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `chain::Chain`
[INFO] [stderr]   --> src/chain.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 | /     pub fn new() -> Chain
[INFO] [stderr] 57 | |     {
[INFO] [stderr] 58 | |
[INFO] [stderr] 59 | |         // Sets the fields to be all empty 
[INFO] [stderr] ...  |
[INFO] [stderr] 72 | |         
[INFO] [stderr] 73 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 38 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]   --> src/chain.rs:94:26
[INFO] [stderr]    |
[INFO] [stderr] 94 |         self.tail_hash = self.chain.get( &key2 ).unwrap().hash().clone();
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.chain[&key2]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/chain.rs:146:35
[INFO] [stderr]     |
[INFO] [stderr] 146 |     pub fn contains( &self, hash: &String ) -> bool
[INFO] [stderr]     |                                   ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `off_blockway`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:100:13
[INFO] [stderr]     |
[INFO] [stderr] 100 |         let value: u8 = 9;
[INFO] [stderr]     |             ^^^^^ help: consider using `_value` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `left_value`
[INFO] [stderr]    --> src/lib.rs:122:13
[INFO] [stderr]     |
[INFO] [stderr] 122 |         let left_value: u8 = 0;
[INFO] [stderr]     |             ^^^^^^^^^^ help: consider using `_left_value` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `right_value`
[INFO] [stderr]    --> src/lib.rs:123:13
[INFO] [stderr]     |
[INFO] [stderr] 123 |         let right_value: u8 = 1;
[INFO] [stderr]     |             ^^^^^^^^^^^ help: consider using `_right_value` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `status`
[INFO] [stderr]    --> src/lib.rs:212:13
[INFO] [stderr]     |
[INFO] [stderr] 212 |         let status = Command::new( "rm" ).args( &[ "-rf", "testing-block.json" ]
[INFO] [stderr]     |             ^^^^^^ help: consider using `_status` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `json_block`
[INFO] [stderr]    --> src/lib.rs:219:13
[INFO] [stderr]     |
[INFO] [stderr] 219 |         let json_block = block::Block::read_and_construct( "testing-block.json" ).expect( "Did not convert json_block" );
[INFO] [stderr]     |             ^^^^^^^^^^ help: consider using `_json_block` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:374:13
[INFO] [stderr]     |
[INFO] [stderr] 374 |         for i in 0 .. 16 
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:423:13
[INFO] [stderr]     |
[INFO] [stderr] 423 |         for i in 0 .. 8 
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:444:13
[INFO] [stderr]     |
[INFO] [stderr] 444 |         for i in 0 .. 8
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:465:13
[INFO] [stderr]     |
[INFO] [stderr] 465 |         for i in 0 .. 8 
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:496:13
[INFO] [stderr]     |
[INFO] [stderr] 496 |         for i in 0 .. 8 
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:529:13
[INFO] [stderr]     |
[INFO] [stderr] 529 |         for i in 0 .. 8
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:569:13
[INFO] [stderr]     |
[INFO] [stderr] 569 |         for i in 0 .. 8
[INFO] [stderr]     |             ^ help: consider using `_i` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `status`
[INFO] [stderr]    --> src/lib.rs:677:13
[INFO] [stderr]     |
[INFO] [stderr] 677 |         let status = Command::new( "rm" ).args( &[ "-rf", "testing-merkle.json" ]
[INFO] [stderr]     |             ^^^^^^ help: consider using `_status` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `json_nodes`
[INFO] [stderr]    --> src/lib.rs:686:13
[INFO] [stderr]     |
[INFO] [stderr] 686 |         let json_nodes = merkle::Merkle::read_and_construct( "testing-merkle.json" ).expect("Did not convert to json_nodes");
[INFO] [stderr]     |             ^^^^^^^^^^ help: consider using `_json_nodes` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `status`
[INFO] [stderr]    --> src/lib.rs:785:13
[INFO] [stderr]     |
[INFO] [stderr] 785 |         let status = Command::new( "rm" ).args( &[ "-rf", "testing-chain.json" ] ).status().expect( "Process failed ");
[INFO] [stderr]     |             ^^^^^^ help: consider using `_status` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d_chain`
[INFO] [stderr]    --> src/lib.rs:798:13
[INFO] [stderr]     |
[INFO] [stderr] 798 |         let d_chain = chain::Chain::read_and_construct( "testing-chain.json" ).expect("Did not convert to d_chain");
[INFO] [stderr]     |             ^^^^^^^ help: consider using `_d_chain` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `status`
[INFO] [stderr]    --> src/lib.rs:909:13
[INFO] [stderr]     |
[INFO] [stderr] 909 |         let status = Command::new( "rm" ).args( &[ "testing-write.json" ] ).status().expect( "Filed to delete the json files" );
[INFO] [stderr]     |             ^^^^^^ help: consider using `_status` instead
[INFO] [stderr] 
[INFO] [stderr] error: useless lint attribute
[INFO] [stderr]  --> src/block.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[allow(dead_code)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![allow(dead_code)]`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[deny(clippy::useless_attribute)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_attribute
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/block.rs:204:48
[INFO] [stderr]     |
[INFO] [stderr] 204 |     pub fn set_previous_hash( &mut self, hash: &String )
[INFO] [stderr]     |                                                ^^^^^^^
[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] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 204 |     pub fn set_previous_hash( &mut self, hash: &str )
[INFO] [stderr]     |                                                ^^^^
[INFO] [stderr] help: change `hash.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 208 |         self.previous_hash = hash.to_string();
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:274:39
[INFO] [stderr]     |
[INFO] [stderr] 274 |                     let current_row = self.map.get( &current_level ).unwrap();
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&current_level]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:312:25
[INFO] [stderr]     |
[INFO] [stderr] 312 |             self.root = self.map.get( &0 ).unwrap()[ 0 ].clone();
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&0]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:403:37
[INFO] [stderr]     |
[INFO] [stderr] 403 |                 let current_nodes = self.map.get( &current_level ).unwrap();
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&current_level]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:627:28
[INFO] [stderr]     |
[INFO] [stderr] 627 |         let target_level = self.map.get( &level ).unwrap();
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&level]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is used to index `target_level`
[INFO] [stderr]    --> src/merkle.rs:629:18
[INFO] [stderr]     |
[INFO] [stderr] 629 |         for i in 0 .. target_level.len()
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 629 |         for (i, <item>) in target_level.iter().enumerate()
[INFO] [stderr]     |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/merkle.rs:659:28
[INFO] [stderr]     |
[INFO] [stderr] 659 |         let target_level = self.map.get( &level ).unwrap();
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.map[&level]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is only used to index `target_level`.
[INFO] [stderr]    --> src/merkle.rs:661:18
[INFO] [stderr]     |
[INFO] [stderr] 661 |         for i in 0 .. target_level.len() 
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 661 |         for <item> in &target_level 
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/proof.rs:68:33
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn verify( &self, root: &String ) -> bool
[INFO] [stderr]    |                                 ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/proof.rs:81:20
[INFO] [stderr]    |
[INFO] [stderr] 81 |               hash = match instance
[INFO] [stderr]    |  ____________________^
[INFO] [stderr] 82 | |             {
[INFO] [stderr] 83 | |
[INFO] [stderr] 84 | |                 &Node::Left( ref proof ) => ::hash_util::create_node_hash( proof, &hash ),
[INFO] [stderr] 85 | |                 &Node::Right( ref proof ) => ::hash_util::create_node_hash( &hash, proof ),
[INFO] [stderr] 86 | |                 
[INFO] [stderr] 87 | |             };
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 81 |             hash = match *instance
[INFO] [stderr] 82 |             {
[INFO] [stderr] 83 | 
[INFO] [stderr] 84 |                 Node::Left( ref proof ) => ::hash_util::create_node_hash( proof, &hash ),
[INFO] [stderr] 85 |                 Node::Right( ref proof ) => ::hash_util::create_node_hash( &hash, proof ),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: item `chain::Chain` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/chain.rs:51:1
[INFO] [stderr]     |
[INFO] [stderr] 51  | / impl Chain
[INFO] [stderr] 52  | | {
[INFO] [stderr] 53  | |
[INFO] [stderr] 54  | |     // Constructor for a new chain
[INFO] [stderr] ...   |
[INFO] [stderr] 234 | |     
[INFO] [stderr] 235 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `chain::Chain`
[INFO] [stderr]   --> src/chain.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 | /     pub fn new() -> Chain
[INFO] [stderr] 57 | |     {
[INFO] [stderr] 58 | |
[INFO] [stderr] 59 | |         // Sets the fields to be all empty 
[INFO] [stderr] ...  |
[INFO] [stderr] 72 | |         
[INFO] [stderr] 73 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 38 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]   --> src/chain.rs:94:26
[INFO] [stderr]    |
[INFO] [stderr] 94 |         self.tail_hash = self.chain.get( &key2 ).unwrap().hash().clone();
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.chain[&key2]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/chain.rs:146:35
[INFO] [stderr]     |
[INFO] [stderr] 146 |     pub fn contains( &self, hash: &String ) -> bool
[INFO] [stderr]     |                                   ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:192:9
[INFO] [stderr]     |
[INFO] [stderr] 192 |         block.write_to( &file_name );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:199:9
[INFO] [stderr]     |
[INFO] [stderr] 199 |         file.read_to_string( &mut json );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:217:9
[INFO] [stderr]     |
[INFO] [stderr] 217 |         block.write_to( "testing-block.json" );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:657:9
[INFO] [stderr]     |
[INFO] [stderr] 657 |         merkle.write_to( &file_name );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:664:9
[INFO] [stderr]     |
[INFO] [stderr] 664 |         file.read_to_string( &mut json );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:684:9
[INFO] [stderr]     |
[INFO] [stderr] 684 |         merkle.write_to( "testing-merkle.json" );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: equality checks against false can be replaced by a negation
[INFO] [stderr]    --> src/lib.rs:746:19
[INFO] [stderr]     |
[INFO] [stderr] 746 |         assert!(  chain.contains( &String::from("9") ) == false );
[INFO] [stderr]     |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try simplifying it as shown: `!chain.contains( &String::from("9") )`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::bool_comparison)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:766:9
[INFO] [stderr]     |
[INFO] [stderr] 766 |         chain.write_to( "testing-chain.json" );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:772:9
[INFO] [stderr]     |
[INFO] [stderr] 772 |         file.read_to_string( &mut string );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:796:9
[INFO] [stderr]     |
[INFO] [stderr] 796 |         chain.write_to( "testing-chain.json" );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:890:9
[INFO] [stderr]     |
[INFO] [stderr] 890 |         transaction.write_to( "testing-write.json" );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:896:9
[INFO] [stderr]     |
[INFO] [stderr] 896 |         file.read_to_string( &mut info );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:921:9
[INFO] [stderr]     |
[INFO] [stderr] 921 |         transaction.write_to( "testing-write.json" );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `off_blockway`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "ac17e74ed7008e8442fa57fe4682da3c4cfca5ae878475796a285d5fa681b033"`
[INFO] running `"docker" "rm" "-f" "ac17e74ed7008e8442fa57fe4682da3c4cfca5ae878475796a285d5fa681b033"`
[INFO] [stdout] ac17e74ed7008e8442fa57fe4682da3c4cfca5ae878475796a285d5fa681b033