Dec 06 06:51:52.805 INFO testing andybug/rustychain against master#906deae0790bd18681b937fe9a141a3c26cf1855 for pr-56514
Dec 06 06:51:52.805 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-1/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +906deae0790bd18681b937fe9a141a3c26cf1855-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 06 06:51:53.076 INFO [stdout] 52c453a804530f78d26778edb17191eb7092bebbe09e014a88cedfc4d635b24c
Dec 06 06:51:53.078 INFO running `"docker" "start" "-a" "52c453a804530f78d26778edb17191eb7092bebbe09e014a88cedfc4d635b24c"`
Dec 06 06:51:53.733 INFO [stderr] usermod: no changes
Dec 06 06:51:53.802 INFO [stderr]    Compiling typenum v1.9.0
Dec 06 06:51:53.802 INFO [stderr]    Compiling odds v0.2.25
Dec 06 06:51:53.803 INFO [stderr]    Compiling serde v1.0.14
Dec 06 06:51:53.803 INFO [stderr]    Compiling serde_derive v1.0.14
Dec 06 06:51:55.328 INFO [stderr]    Compiling nodrop v0.1.9
Dec 06 06:51:57.895 INFO [stderr]    Compiling generic-array v0.8.3
Dec 06 06:51:58.900 INFO [stderr]    Compiling digest v0.6.2
Dec 06 06:51:58.902 INFO [stderr]    Compiling crypto-mac v0.4.0
Dec 06 06:51:59.206 INFO [stderr]    Compiling blake2 v0.6.1
Dec 06 06:52:03.373 INFO [stderr]    Compiling serde_yaml v0.7.1
Dec 06 06:52:05.452 INFO [stderr]    Compiling rustychain v0.1.0 (/source)
Dec 06 06:52:05.810 INFO [stderr] warning: unused import: `SeqAccess`
Dec 06 06:52:05.810 INFO [stderr]  --> src/blockchain/block.rs:9:70
Dec 06 06:52:05.810 INFO [stderr]   |
Dec 06 06:52:05.810 INFO [stderr] 9 | use self::serde::de::{Visitor, Deserialize, Deserializer, MapAccess, SeqAccess};
Dec 06 06:52:05.810 INFO [stderr]   |                                                                      ^^^^^^^^^
Dec 06 06:52:05.810 INFO [stderr]   |
Dec 06 06:52:05.810 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 06 06:52:05.810 INFO [stderr] 
Dec 06 06:52:05.810 INFO [stderr] warning: unused import: `std::fs`
Dec 06 06:52:05.810 INFO [stderr]  --> src/blockchain/chain.rs:5:5
Dec 06 06:52:05.810 INFO [stderr]   |
Dec 06 06:52:05.810 INFO [stderr] 5 | use std::fs;
Dec 06 06:52:05.810 INFO [stderr]   |     ^^^^^^^
Dec 06 06:52:05.810 INFO [stderr] 
Dec 06 06:52:05.810 INFO [stderr] warning: unused import: `Hash256`
Dec 06 06:52:05.810 INFO [stderr]   --> src/blockchain/chain.rs:14:18
Dec 06 06:52:05.810 INFO [stderr]    |
Dec 06 06:52:05.810 INFO [stderr] 14 | use util::hash::{Hash256, HASH256_BYTES};
Dec 06 06:52:05.810 INFO [stderr]    |                  ^^^^^^^
Dec 06 06:52:05.810 INFO [stderr] 
Dec 06 06:52:05.813 INFO [stderr] warning: unused import: `FromHex`
Dec 06 06:52:05.813 INFO [stderr]  --> src/blockchain/transaction.rs:9:17
Dec 06 06:52:05.813 INFO [stderr]   |
Dec 06 06:52:05.813 INFO [stderr] 9 | use util::hex::{FromHex, ToHex};
Dec 06 06:52:05.813 INFO [stderr]   |                 ^^^^^^^
Dec 06 06:52:05.813 INFO [stderr] 
Dec 06 06:52:05.982 INFO [stderr] warning: unused import: `std::io::prelude`
Dec 06 06:52:05.982 INFO [stderr]  --> src/blockchain/chain.rs:9:5
Dec 06 06:52:05.982 INFO [stderr]   |
Dec 06 06:52:05.982 INFO [stderr] 9 | use std::io::prelude::*;
Dec 06 06:52:05.982 INFO [stderr]   |     ^^^^^^^^^^^^^^^^
Dec 06 06:52:05.982 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: method is never used: `reset`
Dec 06 06:52:06.056 INFO [stderr]   --> src/util/hash.rs:25:5
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr] 25 |     pub fn reset(&mut self) {
Dec 06 06:52:06.056 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 06 06:52:06.056 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: function is never used: `now`
Dec 06 06:52:06.056 INFO [stderr]  --> src/util/time.rs:3:1
Dec 06 06:52:06.056 INFO [stderr]   |
Dec 06 06:52:06.056 INFO [stderr] 3 | pub fn now() -> u64 {
Dec 06 06:52:06.056 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.056 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: method is never used: `new`
Dec 06 06:52:06.056 INFO [stderr]   --> src/blockchain/block.rs:26:5
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr] 26 |     pub fn new() -> Block {
Dec 06 06:52:06.056 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.056 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: method is never used: `set_timestamp`
Dec 06 06:52:06.056 INFO [stderr]   --> src/blockchain/block.rs:36:5
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr] 36 |     pub fn set_timestamp(&mut self, ts: u64) {
Dec 06 06:52:06.056 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.056 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: method is never used: `set_previous`
Dec 06 06:52:06.056 INFO [stderr]   --> src/blockchain/block.rs:40:5
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr] 40 |     pub fn set_previous(&mut self, p: &[u8; HASH256_BYTES]) {
Dec 06 06:52:06.056 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.056 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: method is never used: `add_transaction`
Dec 06 06:52:06.056 INFO [stderr]   --> src/blockchain/block.rs:48:5
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr] 48 |     pub fn add_transaction(&mut self, tx: Transaction) {
Dec 06 06:52:06.056 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.056 INFO [stderr] 
Dec 06 06:52:06.056 INFO [stderr] warning: method is never used: `new`
Dec 06 06:52:06.056 INFO [stderr]   --> src/blockchain/transaction.rs:58:5
Dec 06 06:52:06.056 INFO [stderr]    |
Dec 06 06:52:06.056 INFO [stderr] 58 |     pub fn new() -> Transaction {
Dec 06 06:52:06.056 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.057 INFO [stderr] 
Dec 06 06:52:06.057 INFO [stderr] warning: method is never used: `set_timestamp`
Dec 06 06:52:06.057 INFO [stderr]   --> src/blockchain/transaction.rs:67:5
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr] 67 |     pub fn set_timestamp(&mut self, ts: u64) {
Dec 06 06:52:06.057 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.057 INFO [stderr] 
Dec 06 06:52:06.057 INFO [stderr] warning: method is never used: `add_output`
Dec 06 06:52:06.057 INFO [stderr]   --> src/blockchain/transaction.rs:71:5
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr] 71 |     pub fn add_output(&mut self, amount: u64) {
Dec 06 06:52:06.057 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.057 INFO [stderr] 
Dec 06 06:52:06.057 INFO [stderr] warning: variant `Merkle_root` should have a camel case name such as `MerkleRoot`
Dec 06 06:52:06.057 INFO [stderr]   --> src/blockchain/block.rs:88:52
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr] 88 |         enum Field { Version, Timestamp, Previous, Merkle_root };
Dec 06 06:52:06.057 INFO [stderr]    |                                                    ^^^^^^^^^^^
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr]    = note: #[warn(non_camel_case_types)] on by default
Dec 06 06:52:06.057 INFO [stderr] 
Dec 06 06:52:06.057 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 06 06:52:06.057 INFO [stderr]   --> src/blockchain/chain.rs:83:21
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr] 83 |                     writeln!(&mut io::stderr(), "read_chain: {}", e);
Dec 06 06:52:06.057 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 06 06:52:06.057 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 06 06:52:06.057 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 06 06:52:06.057 INFO [stderr] 
Dec 06 06:52:06.057 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 06 06:52:06.057 INFO [stderr]   --> src/blockchain/transaction.rs:19:9
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr] 19 |         hash.write_all(&self.hash);
Dec 06 06:52:06.057 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:06.057 INFO [stderr]    |
Dec 06 06:52:06.057 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 06 06:52:06.057 INFO [stderr] 
Dec 06 06:52:06.926 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.17s
Dec 06 06:52:06.932 INFO [stderr] su: No module specific data is present
Dec 06 06:52:07.162 INFO running `"docker" "inspect" "52c453a804530f78d26778edb17191eb7092bebbe09e014a88cedfc4d635b24c"`
Dec 06 06:52:07.258 INFO running `"docker" "rm" "-f" "52c453a804530f78d26778edb17191eb7092bebbe09e014a88cedfc4d635b24c"`
Dec 06 06:52:07.380 INFO [stdout] 52c453a804530f78d26778edb17191eb7092bebbe09e014a88cedfc4d635b24c
Dec 06 06:52:07.386 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-1/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +906deae0790bd18681b937fe9a141a3c26cf1855-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 06 06:52:07.552 INFO [stdout] 0baf7c591e8ec3810e28606da526e698f5e66d252f2694678ee93734ec59827b
Dec 06 06:52:07.554 INFO running `"docker" "start" "-a" "0baf7c591e8ec3810e28606da526e698f5e66d252f2694678ee93734ec59827b"`
Dec 06 06:52:07.900 INFO [stderr] usermod: no changes
Dec 06 06:52:07.942 INFO [stderr]    Compiling rustychain v0.1.0 (/source)
Dec 06 06:52:08.308 INFO [stderr] warning: unused import: `SeqAccess`
Dec 06 06:52:08.308 INFO [stderr]  --> src/blockchain/block.rs:9:70
Dec 06 06:52:08.308 INFO [stderr]   |
Dec 06 06:52:08.308 INFO [stderr] 9 | use self::serde::de::{Visitor, Deserialize, Deserializer, MapAccess, SeqAccess};
Dec 06 06:52:08.308 INFO [stderr]   |                                                                      ^^^^^^^^^
Dec 06 06:52:08.308 INFO [stderr]   |
Dec 06 06:52:08.308 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 06 06:52:08.308 INFO [stderr] 
Dec 06 06:52:08.309 INFO [stderr] warning: unused import: `std::fs`
Dec 06 06:52:08.309 INFO [stderr]  --> src/blockchain/chain.rs:5:5
Dec 06 06:52:08.309 INFO [stderr]   |
Dec 06 06:52:08.309 INFO [stderr] 5 | use std::fs;
Dec 06 06:52:08.309 INFO [stderr]   |     ^^^^^^^
Dec 06 06:52:08.309 INFO [stderr] 
Dec 06 06:52:08.309 INFO [stderr] warning: unused import: `Hash256`
Dec 06 06:52:08.310 INFO [stderr]   --> src/blockchain/chain.rs:14:18
Dec 06 06:52:08.310 INFO [stderr]    |
Dec 06 06:52:08.310 INFO [stderr] 14 | use util::hash::{Hash256, HASH256_BYTES};
Dec 06 06:52:08.311 INFO [stderr]    |                  ^^^^^^^
Dec 06 06:52:08.311 INFO [stderr] 
Dec 06 06:52:08.311 INFO [stderr] warning: unused import: `FromHex`
Dec 06 06:52:08.311 INFO [stderr]  --> src/blockchain/transaction.rs:9:17
Dec 06 06:52:08.312 INFO [stderr]   |
Dec 06 06:52:08.312 INFO [stderr] 9 | use util::hex::{FromHex, ToHex};
Dec 06 06:52:08.312 INFO [stderr]   |                 ^^^^^^^
Dec 06 06:52:08.312 INFO [stderr] 
Dec 06 06:52:08.476 INFO [stderr] warning: unused import: `std::io::prelude`
Dec 06 06:52:08.476 INFO [stderr]  --> src/blockchain/chain.rs:9:5
Dec 06 06:52:08.476 INFO [stderr]   |
Dec 06 06:52:08.476 INFO [stderr] 9 | use std::io::prelude::*;
Dec 06 06:52:08.476 INFO [stderr]   |     ^^^^^^^^^^^^^^^^
Dec 06 06:52:08.476 INFO [stderr] 
Dec 06 06:52:08.552 INFO [stderr] warning: method is never used: `reset`
Dec 06 06:52:08.553 INFO [stderr]   --> src/util/hash.rs:25:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 25 |     pub fn reset(&mut self) {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: function is never used: `now`
Dec 06 06:52:08.553 INFO [stderr]  --> src/util/time.rs:3:1
Dec 06 06:52:08.553 INFO [stderr]   |
Dec 06 06:52:08.553 INFO [stderr] 3 | pub fn now() -> u64 {
Dec 06 06:52:08.553 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `new`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/block.rs:26:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 26 |     pub fn new() -> Block {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `set_timestamp`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/block.rs:36:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 36 |     pub fn set_timestamp(&mut self, ts: u64) {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `set_previous`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/block.rs:40:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 40 |     pub fn set_previous(&mut self, p: &[u8; HASH256_BYTES]) {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `add_transaction`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/block.rs:48:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 48 |     pub fn add_transaction(&mut self, tx: Transaction) {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `new`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/transaction.rs:58:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 58 |     pub fn new() -> Transaction {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `set_timestamp`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/transaction.rs:67:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 67 |     pub fn set_timestamp(&mut self, ts: u64) {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: method is never used: `add_output`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/transaction.rs:71:5
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 71 |     pub fn add_output(&mut self, amount: u64) {
Dec 06 06:52:08.553 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: variant `Merkle_root` should have a camel case name such as `MerkleRoot`
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/block.rs:88:52
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 88 |         enum Field { Version, Timestamp, Previous, Merkle_root };
Dec 06 06:52:08.553 INFO [stderr]    |                                                    ^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr]    = note: #[warn(non_camel_case_types)] on by default
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/chain.rs:83:21
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 83 |                     writeln!(&mut io::stderr(), "read_chain: {}", e);
Dec 06 06:52:08.553 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 06 06:52:08.553 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 06 06:52:08.553 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.553 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 06 06:52:08.553 INFO [stderr]   --> src/blockchain/transaction.rs:19:9
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr] 19 |         hash.write_all(&self.hash);
Dec 06 06:52:08.553 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 06:52:08.553 INFO [stderr]    |
Dec 06 06:52:08.553 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 06 06:52:08.553 INFO [stderr] 
Dec 06 06:52:08.873 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
Dec 06 06:52:08.878 INFO [stderr] su: No module specific data is present
Dec 06 06:52:09.104 INFO running `"docker" "inspect" "0baf7c591e8ec3810e28606da526e698f5e66d252f2694678ee93734ec59827b"`
Dec 06 06:52:09.179 INFO running `"docker" "rm" "-f" "0baf7c591e8ec3810e28606da526e698f5e66d252f2694678ee93734ec59827b"`
Dec 06 06:52:09.262 INFO [stdout] 0baf7c591e8ec3810e28606da526e698f5e66d252f2694678ee93734ec59827b
Dec 06 06:52:09.264 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-1/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +906deae0790bd18681b937fe9a141a3c26cf1855-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 06 06:52:09.408 INFO [stdout] 863812e1cc4540cdd89afe7089be7645606103cf7b9bec81e4057f7f141c017a
Dec 06 06:52:09.410 INFO running `"docker" "start" "-a" "863812e1cc4540cdd89afe7089be7645606103cf7b9bec81e4057f7f141c017a"`
Dec 06 06:52:09.768 INFO [stderr] usermod: no changes
Dec 06 06:52:09.820 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
Dec 06 06:52:09.822 INFO [stderr]      Running /target/debug/deps/rustychain-71835872e17a9136
Dec 06 06:52:09.824 INFO [stdout] 
Dec 06 06:52:09.824 INFO [stdout] running 0 tests
Dec 06 06:52:09.824 INFO [stdout] 
Dec 06 06:52:09.824 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 06 06:52:09.824 INFO [stdout] 
Dec 06 06:52:09.826 INFO [stderr] su: No module specific data is present
Dec 06 06:52:10.170 INFO running `"docker" "inspect" "863812e1cc4540cdd89afe7089be7645606103cf7b9bec81e4057f7f141c017a"`
Dec 06 06:52:10.360 INFO running `"docker" "rm" "-f" "863812e1cc4540cdd89afe7089be7645606103cf7b9bec81e4057f7f141c017a"`
Dec 06 06:52:10.507 INFO [stdout] 863812e1cc4540cdd89afe7089be7645606103cf7b9bec81e4057f7f141c017a