[INFO] cloning repository https://github.com/MSghais/flat_contract_mmr
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MSghais/flat_contract_mmr" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMSghais%2Fflat_contract_mmr", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMSghais%2Fflat_contract_mmr'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9f4423595bb66d08851ea004593afdd47a51f0e3
[INFO] checking MSghais/flat_contract_mmr against master#4eb62535fc12dd1a63fd43a4173e224e79313c4d for pr-158816
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMSghais%2Fflat_contract_mmr" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/MSghais/flat_contract_mmr
[INFO] finished tweaking git repo https://github.com/MSghais/flat_contract_mmr
[INFO] tweaked toml for git repo https://github.com/MSghais/flat_contract_mmr written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/MSghais/flat_contract_mmr on toolchain 4eb62535fc12dd1a63fd43a4173e224e79313c4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/MSghais/flat_contract_mmr already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: unused manifest key: dependencies.ink_env.dependencies
[INFO] [stderr] warning: `flat_merkle_mountain_range` (manifest) generated 1 warning
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded scale-info-derive v2.0.0
[INFO] [stderr]   Downloaded parity-scale-codec-derive v3.1.0
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[INFO] [stderr]   Downloaded displaydoc v0.2.3
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[INFO] [stderr]   Downloaded ink_lang_codegen v3.0.0-rc9
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[INFO] [stderr]   Downloaded blake2 v0.9.2
[INFO] [stderr]   Downloaded secp256k1 v0.21.3
[INFO] [stderr]   Downloaded ink_lang_ir v3.0.0-rc9
[INFO] [stderr]   Downloaded syn v1.0.88
[INFO] [stderr]   Downloaded ink_storage v3.0.0-rc9
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[INFO] [stderr]   Downloaded secp256k1-sys v0.4.2
[INFO] [stderr]   Downloaded sha3 v0.10.1
[INFO] [stderr]   Downloaded libc v0.2.120
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f
[INFO] running `Command { std: "docker" "start" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f" "/opt/rustwide/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f" "/opt/rustwide/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: unused manifest key: dependencies.ink_env.dependencies
[INFO] [stderr] warning: `flat_merkle_mountain_range` (manifest) generated 1 warning
[INFO] [stderr]    Compiling syn v1.0.88
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling radium v0.7.0
[INFO] [stderr]    Compiling libc v0.2.120
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]     Checking funty v2.0.0
[INFO] [stderr]     Checking arrayvec v0.7.2
[INFO] [stderr]     Checking byte-slice-cast v1.2.1
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]     Checking block-buffer v0.10.2
[INFO] [stderr]     Checking crypto-common v0.1.3
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking wyz v0.5.0
[INFO] [stderr]     Checking ink_prelude v3.0.0-rc9
[INFO] [stderr]    Compiling safe-proc-macro2 v1.0.36
[INFO] [stderr]     Checking digest v0.10.3
[INFO] [stderr]     Checking keccak v0.1.0
[INFO] [stderr]     Checking arrayref v0.3.6
[INFO] [stderr]     Checking cpufeatures v0.2.1
[INFO] [stderr]     Checking ink_allocator v3.0.0-rc9
[INFO] [stderr]    Compiling paste v1.0.6
[INFO] [stderr]     Checking blake2 v0.10.4
[INFO] [stderr]     Checking sha2 v0.10.2
[INFO] [stderr]     Checking libsecp256k1-core v0.3.0
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking array-init v2.0.0
[INFO] [stderr]     Checking sha3 v0.10.1
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]    Compiling unzip3 v1.0.0
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking blake2 v0.9.2
[INFO] [stderr]     Checking bitvec v1.0.0
[INFO] [stderr]    Compiling generic-array v0.14.5
[INFO] [stderr]    Compiling safe-quote v1.0.15
[INFO] [stderr]     Checking getrandom v0.2.5
[INFO] [stderr]    Compiling secp256k1-sys v0.4.2
[INFO] [stderr]    Compiling safe-regex-compiler v0.2.5
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling safe-regex-macro v0.2.5
[INFO] [stderr]     Checking safe-regex v0.2.5
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]     Checking secp256k1 v0.21.3
[INFO] [stderr]    Compiling libsecp256k1-gen-genmult v0.3.0
[INFO] [stderr]    Compiling libsecp256k1-gen-ecmult v0.3.0
[INFO] [stderr]    Compiling libsecp256k1 v0.7.0
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling impl-serde v0.3.2
[INFO] [stderr]    Compiling ink_lang_ir v3.0.0-rc9
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling impl-trait-for-tuples v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]    Compiling ink_storage_derive v3.0.0-rc9
[INFO] [stderr]    Compiling displaydoc v0.2.3
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling proc-macro-crate v1.1.3
[INFO] [stderr]    Compiling parity-scale-codec-derive v3.1.0
[INFO] [stderr]    Compiling scale-info-derive v2.0.0
[INFO] [stderr]    Compiling parity-scale-codec v3.1.0
[INFO] [stderr]    Compiling ink_lang_codegen v3.0.0-rc9
[INFO] [stderr]    Compiling ink_primitives v3.0.0-rc9
[INFO] [stderr]    Compiling ink_lang_macro v3.0.0-rc9
[INFO] [stderr]    Compiling pink-extension-macro v0.1.3
[INFO] [stderr]     Checking scale-info v2.0.1
[INFO] [stderr]     Checking arber v0.2.0 (/opt/rustwide/workdir/arber)
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]   --> arber/src/error.rs:28:10
[INFO] [stdout]    |
[INFO] [stdout] 28 | #[derive(Display, Debug, PartialEq, Eq, Clone)]
[INFO] [stdout]    |          ^------
[INFO] [stdout]    |          |
[INFO] [stdout]    |          `Display` is not local
[INFO] [stdout]    |          move the `impl` block outside of this constant `_DERIVE_Display_FOR_Error`
[INFO] [stdout] 29 | pub enum Error {
[INFO] [stdout]    |          ----- `Error` is not local
[INFO] [stdout]    |
[INFO] [stdout]    = note: the derive macro `Display` defines the non-local `impl`, and may need to be changed
[INFO] [stdout]    = note: the derive macro `Display` may come from an old version of the `displaydoc` crate, try updating your dependency with `cargo update -p displaydoc`
[INFO] [stdout]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]    = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint
[INFO] [stdout]    = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout]    = note: this warning originates in the derive macro `Display` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ink_metadata v3.0.0-rc9
[INFO] [stderr]     Checking ink_env v3.0.0-rc9
[INFO] [stderr]     Checking ink_storage v3.0.0-rc9
[INFO] [stderr]     Checking ink_eth_compatibility v3.0.0-rc9
[INFO] [stderr]     Checking ink_lang v3.0.0-rc9
[INFO] [stderr]     Checking pink-extension v0.1.5
[INFO] [stderr]     Checking flat_merkle_mountain_range v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition value: `__ink_dylint_Storage`
[INFO] [stdout]   --> lib.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     #[derive(SpreadAllocate)]
[INFO] [stdout] 42 | |     pub struct MerkleFlatContract {
[INFO] [stdout] 43 | |         admin: AccountId,
[INFO] [stdout] 44 | |         attestation_pubkey: Vec<u8>,
[INFO] [stdout] ...  |
[INFO] [stdout] 66 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default`, `ink-as-dependency`, `ink_metadata`, `scale-info`, and `std`
[INFO] [stdout]    = help: consider adding `__ink_dylint_Storage` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `__ink_dylint_Constructor`
[INFO] [stdout]    --> lib.rs:87:9
[INFO] [stdout]     |
[INFO] [stdout]  87 | /         pub fn default() -> Self {
[INFO] [stdout]  88 | |             // Generate a Sr25519 key pair
[INFO] [stdout]  89 | |             let privkey = derive_sr25519_key!(b"gist-attestation-key");
[INFO] [stdout]  90 | |             let pubkey = get_public_key!(&privkey, SigType::Sr25519);
[INFO] [stdout] ...   |
[INFO] [stdout] 107 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `default`, `ink-as-dependency`, `ink_metadata`, `scale-info`, and `std`
[INFO] [stdout]     = help: consider adding `__ink_dylint_Constructor` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `__ink_dylint_Constructor`
[INFO] [stdout]    --> lib.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 | /         pub fn new_mmr() -> Self {
[INFO] [stdout] 113 | |             // Generate a Sr25519 key pair
[INFO] [stdout] 114 | |             let privkey = derive_sr25519_key!(b"gist-attestation-key");
[INFO] [stdout] 115 | |             let pubkey = get_public_key!(&privkey, SigType::Sr25519);
[INFO] [stdout] ...   |
[INFO] [stdout] 137 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `default`, `ink-as-dependency`, `ink_metadata`, `scale-info`, and `std`
[INFO] [stdout]     = help: consider adding `__ink_dylint_Constructor` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Store`
[INFO] [stdout]   --> lib.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         Store,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ink_lang as ink`
[INFO] [stdout]    --> lib.rs:275:13
[INFO] [stdout]     |
[INFO] [stdout] 275 |         use ink_lang as ink;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MerkleProof` and `hash_with_index`
[INFO] [stdout]    --> lib.rs:282:13
[INFO] [stdout]     |
[INFO] [stdout] 282 |             hash_with_index, 
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 283 |             MerkleProof,
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `__ink_dylint_Storage`
[INFO] [stdout]   --> lib.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     #[derive(SpreadAllocate)]
[INFO] [stdout] 42 | |     pub struct MerkleFlatContract {
[INFO] [stdout] 43 | |         admin: AccountId,
[INFO] [stdout] 44 | |         attestation_pubkey: Vec<u8>,
[INFO] [stdout] ...  |
[INFO] [stdout] 66 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `default`, `ink-as-dependency`, `ink_metadata`, `scale-info`, and `std`
[INFO] [stdout]    = help: consider adding `__ink_dylint_Storage` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `__ink_dylint_Constructor`
[INFO] [stdout]    --> lib.rs:87:9
[INFO] [stdout]     |
[INFO] [stdout]  87 | /         pub fn default() -> Self {
[INFO] [stdout]  88 | |             // Generate a Sr25519 key pair
[INFO] [stdout]  89 | |             let privkey = derive_sr25519_key!(b"gist-attestation-key");
[INFO] [stdout]  90 | |             let pubkey = get_public_key!(&privkey, SigType::Sr25519);
[INFO] [stdout] ...   |
[INFO] [stdout] 107 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `default`, `ink-as-dependency`, `ink_metadata`, `scale-info`, and `std`
[INFO] [stdout]     = help: consider adding `__ink_dylint_Constructor` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `__ink_dylint_Constructor`
[INFO] [stdout]    --> lib.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 | /         pub fn new_mmr() -> Self {
[INFO] [stdout] 113 | |             // Generate a Sr25519 key pair
[INFO] [stdout] 114 | |             let privkey = derive_sr25519_key!(b"gist-attestation-key");
[INFO] [stdout] 115 | |             let pubkey = get_public_key!(&privkey, SigType::Sr25519);
[INFO] [stdout] ...   |
[INFO] [stdout] 137 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `default`, `ink-as-dependency`, `ink_metadata`, `scale-info`, and `std`
[INFO] [stdout]     = help: consider adding `__ink_dylint_Constructor` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Store`
[INFO] [stdout]   --> lib.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         Store,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Hashable`
[INFO] [stdout]    --> lib.rs:278:13
[INFO] [stdout]     |
[INFO] [stdout] 278 |             Hashable,
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Store`
[INFO] [stdout]    --> lib.rs:279:13
[INFO] [stdout]     |
[INFO] [stdout] 279 |             Store,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `merkle`
[INFO] [stdout]   --> lib.rs:96:17
[INFO] [stdout]    |
[INFO] [stdout] 96 |             let merkle = MerkleMountainRange::new(0, s);
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_merkle`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> lib.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |             let mut hashes:Vec<String> = Vec::new();
[INFO] [stdout]     |                 ----^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hashes`
[INFO] [stdout]    --> lib.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |             let mut hashes:Vec<String> = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hashes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `merkle`
[INFO] [stdout]    --> lib.rs:122:17
[INFO] [stdout]     |
[INFO] [stdout] 122 |             let merkle = MerkleMountainRange::new(0, s);
[INFO] [stdout]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_merkle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hash_values` is never used
[INFO] [stdout]    --> lib.rs:318:16
[INFO] [stdout]     |
[INFO] [stdout] 318 |         pub fn hash_values() -> Vec<String> {
[INFO] [stdout]     |                ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `merkle`
[INFO] [stdout]   --> lib.rs:96:17
[INFO] [stdout]    |
[INFO] [stdout] 96 |             let merkle = MerkleMountainRange::new(0, s);
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_merkle`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> lib.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |             let mut hashes:Vec<String> = Vec::new();
[INFO] [stdout]     |                 ----^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hashes`
[INFO] [stdout]    --> lib.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |             let mut hashes:Vec<String> = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hashes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `merkle`
[INFO] [stdout]    --> lib.rs:122:17
[INFO] [stdout]     |
[INFO] [stdout] 122 |             let merkle = MerkleMountainRange::new(0, s);
[INFO] [stdout]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_merkle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 31.13s
[INFO] running `Command { std: "docker" "inspect" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f", kill_on_drop: false }`
[INFO] [stdout] 4735fbf67144780114a8a102b295ed851eff36d1d6f4bbe3ea9f3c9a3266106f
