[INFO] updating cached repository matteocam/pay-to-sudoku-attack
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/matteocam/pay-to-sudoku-attack
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/matteocam/pay-to-sudoku-attack" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/matteocam/pay-to-sudoku-attack"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/matteocam/pay-to-sudoku-attack'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/matteocam/pay-to-sudoku-attack" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/matteocam/pay-to-sudoku-attack"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/matteocam/pay-to-sudoku-attack'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cfc072fcdc17e10916185308edbdd232be808ad4
[INFO] sha for GitHub repo matteocam/pay-to-sudoku-attack: cfc072fcdc17e10916185308edbdd232be808ad4
[INFO] validating manifest of matteocam/pay-to-sudoku-attack on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of matteocam/pay-to-sudoku-attack on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing matteocam/pay-to-sudoku-attack
[INFO] finished frobbing matteocam/pay-to-sudoku-attack
[INFO] frobbed toml for matteocam/pay-to-sudoku-attack written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/matteocam/pay-to-sudoku-attack/Cargo.toml
[INFO] started frobbing matteocam/pay-to-sudoku-attack
[INFO] finished frobbing matteocam/pay-to-sudoku-attack
[INFO] frobbed toml for matteocam/pay-to-sudoku-attack written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/matteocam/pay-to-sudoku-attack/Cargo.toml
[INFO] crate matteocam/pay-to-sudoku-attack already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking matteocam/pay-to-sudoku-attack against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-0/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/matteocam/pay-to-sudoku-attack:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c2b50c07477eb4aacb9b089cc88a7f0375dbdad95e5aece69557d5c84a57d4ec
[INFO] running `"docker" "start" "-a" "c2b50c07477eb4aacb9b089cc88a7f0375dbdad95e5aece69557d5c84a57d4ec"`
[INFO] [stderr]     Checking thread-scoped v1.0.1
[INFO] [stderr]     Checking fixedbitset v0.1.6
[INFO] [stderr]     Checking whiteread v0.2.0
[INFO] [stderr]     Checking hex v0.1.0
[INFO] [stderr]     Checking num_cpus v0.2.13
[INFO] [stderr]     Checking num-complex v0.1.37
[INFO] [stderr]    Compiling miniz-sys v0.1.9
[INFO] [stderr]    Compiling bzip2-sys v0.1.5
[INFO] [stderr]     Checking num-bigint v0.1.37
[INFO] [stderr]     Checking uuid v0.1.18
[INFO] [stderr]     Checking solicit v0.4.4
[INFO] [stderr]     Checking url v0.2.38
[INFO] [stderr]     Checking num-rational v0.1.36
[INFO] [stderr]     Checking flate2 v0.2.19
[INFO] [stderr]     Checking bzip2 v0.2.4
[INFO] [stderr]     Checking cookie v0.1.21
[INFO] [stderr]     Checking num v0.1.37
[INFO] [stderr]     Checking serde v0.6.15
[INFO] [stderr]     Checking mime v0.1.3
[INFO] [stderr]     Checking strason v0.3.4
[INFO] [stderr]     Checking bincode v0.4.1
[INFO] [stderr]     Checking hyper v0.6.16
[INFO] [stderr]     Checking jsonrpc v0.7.6
[INFO] [stderr]     Checking pay-to-sudoku v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/main.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[macro_use] extern crate jsonrpc;
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Read`, `Write`, `self`
[INFO] [stderr]   --> src/main.rs:18:15
[INFO] [stderr]    |
[INFO] [stderr] 18 | use std::io::{self, Read, Write};
[INFO] [stderr]    |               ^^^^  ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `FromHex`
[INFO] [stderr]   --> src/main.rs:25:18
[INFO] [stderr]    |
[INFO] [stderr] 25 | use hex::{ToHex, FromHex};
[INFO] [stderr]    |                  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:54:32
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let closure: &mut &mut for<'a> FnMut(&'a [u8], &'a [i8]) = mem::transmute(cb);
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [i8])`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:66:32
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let closure: &mut &mut for<'a> FnMut(&'a [i8], &'a [i8]) = mem::transmute(cb);
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [i8], &'a [i8])`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:73:22
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:97:22
[INFO] [stderr]    |
[INFO] [stderr] 97 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ffi.rs:111:22
[INFO] [stderr]     |
[INFO] [stderr] 111 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde`
[INFO] [stderr]  --> src/bitcoin.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use serde;
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ToHex`
[INFO] [stderr]  --> src/bitcoin.rs:8:11
[INFO] [stderr]   |
[INFO] [stderr] 8 | use hex::{ToHex, FromHex};
[INFO] [stderr]   |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/main.rs:311:28
[INFO] [stderr]     |
[INFO] [stderr] 311 |                         if (rx.lock().unwrap().try_recv().is_ok()) {
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/main.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[macro_use] extern crate jsonrpc;
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Read`, `Write`, `self`
[INFO] [stderr]   --> src/main.rs:18:15
[INFO] [stderr]    |
[INFO] [stderr] 18 | use std::io::{self, Read, Write};
[INFO] [stderr]    |               ^^^^  ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `FromHex`
[INFO] [stderr]   --> src/main.rs:25:18
[INFO] [stderr]    |
[INFO] [stderr] 25 | use hex::{ToHex, FromHex};
[INFO] [stderr]    |                  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:54:32
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let closure: &mut &mut for<'a> FnMut(&'a [u8], &'a [i8]) = mem::transmute(cb);
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [i8])`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:66:32
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let closure: &mut &mut for<'a> FnMut(&'a [i8], &'a [i8]) = mem::transmute(cb);
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [i8], &'a [i8])`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:73:22
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ffi.rs:97:22
[INFO] [stderr]    |
[INFO] [stderr] 97 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ffi.rs:111:22
[INFO] [stderr]     |
[INFO] [stderr] 111 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde`
[INFO] [stderr]  --> src/bitcoin.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use serde;
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ToHex`
[INFO] [stderr]  --> src/bitcoin.rs:8:11
[INFO] [stderr]   |
[INFO] [stderr] 8 | use hex::{ToHex, FromHex};
[INFO] [stderr]   |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/main.rs:311:28
[INFO] [stderr]     |
[INFO] [stderr] 311 |                         if (rx.lock().unwrap().try_recv().is_ok()) {
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `encrypted_solution`
[INFO] [stderr]    --> src/main.rs:179:16
[INFO] [stderr]     |
[INFO] [stderr] 179 |               |encrypted_solution, proof| {}));
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_encrypted_solution`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `proof`
[INFO] [stderr]    --> src/main.rs:179:36
[INFO] [stderr]     |
[INFO] [stderr] 179 |               |encrypted_solution, proof| {}));
[INFO] [stderr]     |                                    ^^^^^ help: consider prefixing with an underscore: `_proof`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/main.rs:352:13
[INFO] [stderr]     |
[INFO] [stderr] 352 |     fn from(a: bincode::serde::SerializeError) -> ProtoError {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/main.rs:358:13
[INFO] [stderr]     |
[INFO] [stderr] 358 |     fn from(a: bincode::serde::DeserializeError) -> ProtoError {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dimension`
[INFO] [stderr]   --> src/sudoku.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn new(dimension: usize) -> Possible {
[INFO] [stderr]    |            ^^^^^^^^^ help: consider prefixing with an underscore: `_dimension`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `undo`
[INFO] [stderr]    --> src/sudoku.rs:218:21
[INFO] [stderr]     |
[INFO] [stderr] 218 |                 let undo = cell.set(candidate);
[INFO] [stderr]     |                     ^^^^ help: consider prefixing with an underscore: `_undo`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]   --> src/bitcoin.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let res = client.send_request(&request).unwrap();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]    --> src/bitcoin.rs:146:9
[INFO] [stderr]     |
[INFO] [stderr] 146 |     let res = client.send_request(&request).unwrap();
[INFO] [stderr]     |         ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]    --> src/bitcoin.rs:181:9
[INFO] [stderr]     |
[INFO] [stderr] 181 |     let res = client.send_request(&request).unwrap();
[INFO] [stderr]     |         ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:201:9
[INFO] [stderr]     |
[INFO] [stderr] 201 |     let mut h_of_key: Vec<u8> = try!(deserialize_from(stream, Infinite));
[INFO] [stderr]     |         ----^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:324:13
[INFO] [stderr]     |
[INFO] [stderr] 324 |         let mut txid;
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] warning: unused variable: `encrypted_solution`
[INFO] [stderr]    --> src/main.rs:179:16
[INFO] [stderr]     |
[INFO] [stderr] 179 |               |encrypted_solution, proof| {}));
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_encrypted_solution`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `proof`
[INFO] [stderr]    --> src/main.rs:179:36
[INFO] [stderr]     |
[INFO] [stderr] 179 |               |encrypted_solution, proof| {}));
[INFO] [stderr]     |                                    ^^^^^ help: consider prefixing with an underscore: `_proof`
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:325:13
[INFO] [stderr]     |
[INFO] [stderr] 325 |         let mut vout;
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/main.rs:352:13
[INFO] [stderr]     |
[INFO] [stderr] 352 |     fn from(a: bincode::serde::SerializeError) -> ProtoError {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/main.rs:358:13
[INFO] [stderr]     |
[INFO] [stderr] 358 |     fn from(a: bincode::serde::DeserializeError) -> ProtoError {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dimension`
[INFO] [stderr]   --> src/sudoku.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn new(dimension: usize) -> Possible {
[INFO] [stderr]    |            ^^^^^^^^^ help: consider prefixing with an underscore: `_dimension`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `undo`
[INFO] [stderr]    --> src/sudoku.rs:218:21
[INFO] [stderr]     |
[INFO] [stderr] 218 |                 let undo = cell.set(candidate);
[INFO] [stderr]     |                     ^^^^ help: consider prefixing with an underscore: `_undo`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]   --> src/bitcoin.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let res = client.send_request(&request).unwrap();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]    --> src/bitcoin.rs:146:9
[INFO] [stderr]     |
[INFO] [stderr] 146 |     let res = client.send_request(&request).unwrap();
[INFO] [stderr]     |         ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]    --> src/bitcoin.rs:181:9
[INFO] [stderr]     |
[INFO] [stderr] 181 |     let res = client.send_request(&request).unwrap();
[INFO] [stderr]     |         ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/sudoku.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |         let mut grid = Sudoku::new(n);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:201:9
[INFO] [stderr]     |
[INFO] [stderr] 201 |     let mut h_of_key: Vec<u8> = try!(deserialize_from(stream, Infinite));
[INFO] [stderr]     |         ----^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:324:13
[INFO] [stderr]     |
[INFO] [stderr] 324 |         let mut txid;
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:325:13
[INFO] [stderr]     |
[INFO] [stderr] 325 |         let mut vout;
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/sudoku.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |         let mut grid = Sudoku::new(n);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print`
[INFO] [stderr]    --> src/sudoku.rs:164:5
[INFO] [stderr]     |
[INFO] [stderr] 164 |     pub fn print(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_sudoku_from_stdin`
[INFO] [stderr]   --> src/util.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | pub fn get_sudoku_from_stdin(dimension: usize) -> Vec<u8> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:117:9
[INFO] [stderr]     |
[INFO] [stderr] 117 |         handle_server(&mut stream, &ctx, n, &mut rpc);
[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/main.rs:141:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |                     handle_client(&mut stream, &ctx, n, &mut rpc);
[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/main.rs:276:9
[INFO] [stderr]     |
[INFO] [stderr] 276 |         serialize_into(stream, &proof, Infinite);
[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/main.rs:277:9
[INFO] [stderr]     |
[INFO] [stderr] 277 |         serialize_into(stream, &encrypted_solution, Infinite);
[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/main.rs:278:9
[INFO] [stderr]     |
[INFO] [stderr] 278 |         serialize_into(stream, &h_of_key, Infinite);
[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/main.rs:289:9
[INFO] [stderr]     |
[INFO] [stderr] 289 |         serialize_into(stream, &solving_pubkey, Infinite);
[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/main.rs:318:17
[INFO] [stderr]     |
[INFO] [stderr] 318 |                 tx.send(());
[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/sudoku.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |         grid.solve(&mut rng);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 |         -> *const Keypair;
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:25:27
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn gen_proof(keypair: *const Keypair, h: *mut c_void,
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:30:40
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn malicious_snark_verify(keypair: *const Keypair,
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:38:40
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn prove_malicious_verify(keypair: *const Keypair, h: *mut c_void,
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/util.rs:64:17
[INFO] [stderr]    |
[INFO] [stderr] 64 |                 decoder.finish();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print`
[INFO] [stderr]    --> src/sudoku.rs:164:5
[INFO] [stderr]     |
[INFO] [stderr] 164 |     pub fn print(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_sudoku_from_stdin`
[INFO] [stderr]   --> src/util.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | pub fn get_sudoku_from_stdin(dimension: usize) -> Vec<u8> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:117:9
[INFO] [stderr]     |
[INFO] [stderr] 117 |         handle_server(&mut stream, &ctx, n, &mut rpc);
[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/main.rs:141:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |                     handle_client(&mut stream, &ctx, n, &mut rpc);
[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/main.rs:276:9
[INFO] [stderr]     |
[INFO] [stderr] 276 |         serialize_into(stream, &proof, Infinite);
[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/main.rs:277:9
[INFO] [stderr]     |
[INFO] [stderr] 277 |         serialize_into(stream, &encrypted_solution, Infinite);
[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/main.rs:278:9
[INFO] [stderr]     |
[INFO] [stderr] 278 |         serialize_into(stream, &h_of_key, Infinite);
[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/main.rs:289:9
[INFO] [stderr]     |
[INFO] [stderr] 289 |         serialize_into(stream, &solving_pubkey, Infinite);
[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/main.rs:318:17
[INFO] [stderr]     |
[INFO] [stderr] 318 |                 tx.send(());
[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/sudoku.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |         grid.solve(&mut rng);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 |         -> *const Keypair;
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:25:27
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn gen_proof(keypair: *const Keypair, h: *mut c_void,
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:30:40
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn malicious_snark_verify(keypair: *const Keypair,
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `ffi::Keypair` which is not FFI-safe: this struct has no fields
[INFO] [stderr]   --> src/ffi.rs:38:40
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn prove_malicious_verify(keypair: *const Keypair, h: *mut c_void,
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a member to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/ffi.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Keypair;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/util.rs:64:17
[INFO] [stderr]    |
[INFO] [stderr] 64 |                 decoder.finish();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.53s
[INFO] running `"docker" "inspect" "c2b50c07477eb4aacb9b089cc88a7f0375dbdad95e5aece69557d5c84a57d4ec"`
[INFO] running `"docker" "rm" "-f" "c2b50c07477eb4aacb9b089cc88a7f0375dbdad95e5aece69557d5c84a57d4ec"`
[INFO] [stdout] c2b50c07477eb4aacb9b089cc88a7f0375dbdad95e5aece69557d5c84a57d4ec