[INFO] cloning repository https://github.com/matteocam/pay-to-sudoku-attack
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/matteocam/pay-to-sudoku-attack" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatteocam%2Fpay-to-sudoku-attack", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatteocam%2Fpay-to-sudoku-attack'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cfc072fcdc17e10916185308edbdd232be808ad4
[INFO] testing matteocam/pay-to-sudoku-attack against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatteocam%2Fpay-to-sudoku-attack" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/matteocam/pay-to-sudoku-attack on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/matteocam/pay-to-sudoku-attack
[INFO] finished tweaking git repo https://github.com/matteocam/pay-to-sudoku-attack
[INFO] tweaked toml for git repo https://github.com/matteocam/pay-to-sudoku-attack written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/matteocam/pay-to-sudoku-attack already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d664c9be7cac14ce41b3f9b3bf89e3943a3b761bdfc211a1ab8cef30593e3f2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6d664c9be7cac14ce41b3f9b3bf89e3943a3b761bdfc211a1ab8cef30593e3f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d664c9be7cac14ce41b3f9b3bf89e3943a3b761bdfc211a1ab8cef30593e3f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d664c9be7cac14ce41b3f9b3bf89e3943a3b761bdfc211a1ab8cef30593e3f2", kill_on_drop: false }`
[INFO] [stdout] 6d664c9be7cac14ce41b3f9b3bf89e3943a3b761bdfc211a1ab8cef30593e3f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3280da0a74e02a05ba899a86fbbceebb6b36141cde64480cb0d7c473a6ec722a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3280da0a74e02a05ba899a86fbbceebb6b36141cde64480cb0d7c473a6ec722a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.21
[INFO] [stderr]    Compiling rustc-serialize v0.3.23
[INFO] [stderr]    Compiling num-traits v0.1.37
[INFO] [stderr]    Compiling gcc v0.3.45
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]    Compiling log v0.3.7
[INFO] [stderr]    Compiling matches v0.1.4
[INFO] [stderr]    Compiling language-tags v0.0.7
[INFO] [stderr]    Compiling httparse v1.2.2
[INFO] [stderr]    Compiling traitobject v0.0.1
[INFO] [stderr]    Compiling strsim v0.4.1
[INFO] [stderr]    Compiling ansi_term v0.7.5
[INFO] [stderr]    Compiling vec_map v0.4.0
[INFO] [stderr]    Compiling fixedbitset v0.1.6
[INFO] [stderr]    Compiling whiteread v0.2.0
[INFO] [stderr]    Compiling hex v0.1.0
[INFO] [stderr]    Compiling thread-scoped v1.0.1
[INFO] [stderr]    Compiling hpack v0.2.0
[INFO] [stderr]    Compiling clap v1.5.6
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling time v0.1.36
[INFO] [stderr]    Compiling num_cpus v0.2.13
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]    Compiling num-integer v0.1.34
[INFO] [stderr]    Compiling solicit v0.4.4
[INFO] [stderr]    Compiling num-iter v0.1.33
[INFO] [stderr]    Compiling unicase v1.4.0
[INFO] [stderr]    Compiling bzip2-sys v0.1.5
[INFO] [stderr]    Compiling miniz-sys v0.1.9
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling bzip2 v0.2.4
[INFO] [stderr]    Compiling flate2 v0.2.19
[INFO] [stderr]    Compiling num-bigint v0.1.37
[INFO] [stderr]    Compiling num-complex v0.1.37
[INFO] [stderr]    Compiling uuid v0.1.18
[INFO] [stderr]    Compiling url v0.2.38
[INFO] [stderr]    Compiling num-rational v0.1.36
[INFO] [stderr]    Compiling cookie v0.1.21
[INFO] [stderr]    Compiling num v0.1.37
[INFO] [stderr]    Compiling serde v0.6.15
[INFO] [stderr]    Compiling mime v0.1.3
[INFO] [stderr]    Compiling strason v0.3.4
[INFO] [stderr]    Compiling bincode v0.4.1
[INFO] [stderr]    Compiling hyper v0.6.16
[INFO] [stderr]    Compiling jsonrpc v0.7.6
[INFO] [stderr]    Compiling pay-to-sudoku v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:194:5
[INFO] [stdout]     |
[INFO] [stdout] 194 |     try!(serialize_into(stream, &puzzle, Infinite));
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:198:28
[INFO] [stdout]     |
[INFO] [stdout] 198 |     let proof: Cow<[u8]> = try!(deserialize_from(stream, Infinite));
[INFO] [stdout]     |                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:199:41
[INFO] [stdout]     |
[INFO] [stdout] 199 |     let encrypted_solution: Cow<[u8]> = try!(deserialize_from(stream, Infinite));
[INFO] [stdout]     |                                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:201:33
[INFO] [stdout]     |
[INFO] [stdout] 201 |     let mut h_of_key: Vec<u8> = try!(deserialize_from(stream, Infinite));
[INFO] [stdout]     |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:214:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |         try!(serialize_into(stream, &redeem_pubkey, Infinite));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 |         try!(serialize_into(stream, &cltv_height, Infinite));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:217:38
[INFO] [stdout]     |
[INFO] [stdout] 217 |         let solving_pubkey: String = try!(deserialize_from(stream, Infinite));
[INFO] [stdout]     |                                      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[macro_use] extern crate jsonrpc;
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Read`, `Write`, `self`
[INFO] [stdout]   --> src/main.rs:18:15
[INFO] [stdout]    |
[INFO] [stdout] 18 | use std::io::{self, Read, Write};
[INFO] [stdout]    |               ^^^^  ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FromHex`
[INFO] [stdout]   --> src/main.rs:25:18
[INFO] [stdout]    |
[INFO] [stdout] 25 | use hex::{ToHex, FromHex};
[INFO] [stdout]    |                  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ffi.rs:54:32
[INFO] [stdout]    |
[INFO] [stdout] 54 |         let closure: &mut &mut for<'a> FnMut(&'a [u8], &'a [i8]) = mem::transmute(cb);
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [i8])`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ffi.rs:66:32
[INFO] [stdout]    |
[INFO] [stdout] 66 |         let closure: &mut &mut for<'a> FnMut(&'a [i8], &'a [i8]) = mem::transmute(cb);
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [i8], &'a [i8])`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ffi.rs:73:22
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ffi.rs:97:22
[INFO] [stdout]    |
[INFO] [stdout] 97 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ffi.rs:111:22
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let mut cb: &mut for<'a> FnMut(&'a [u8], &'a [u8]) = &mut f;
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn for<'a> FnMut(&'a [u8], &'a [u8])`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde`
[INFO] [stdout]  --> src/bitcoin.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serde;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ToHex`
[INFO] [stdout]  --> src/bitcoin.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | use hex::{ToHex, FromHex};
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:311:28
[INFO] [stdout]     |
[INFO] [stdout] 311 |                         if (rx.lock().unwrap().try_recv().is_ok()) {
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `encrypted_solution`
[INFO] [stdout]    --> src/main.rs:179:16
[INFO] [stdout]     |
[INFO] [stdout] 179 |               |encrypted_solution, proof| {}));
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_encrypted_solution`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `proof`
[INFO] [stdout]    --> src/main.rs:179:36
[INFO] [stdout]     |
[INFO] [stdout] 179 |               |encrypted_solution, proof| {}));
[INFO] [stdout]     |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_proof`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:352:13
[INFO] [stdout]     |
[INFO] [stdout] 352 |     fn from(a: bincode::serde::SerializeError) -> ProtoError {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:358:13
[INFO] [stdout]     |
[INFO] [stdout] 358 |     fn from(a: bincode::serde::DeserializeError) -> ProtoError {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dimension`
[INFO] [stdout]   --> src/sudoku.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn new(dimension: usize) -> Possible {
[INFO] [stdout]    |            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_dimension`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `undo`
[INFO] [stdout]    --> src/sudoku.rs:218:21
[INFO] [stdout]     |
[INFO] [stdout] 218 |                 let undo = cell.set(candidate);
[INFO] [stdout]     |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_undo`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/bitcoin.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let res = client.send_request(&request).unwrap();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/bitcoin.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let res = client.send_request(&request).unwrap();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/bitcoin.rs:181:9
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let res = client.send_request(&request).unwrap();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 201 |     let mut h_of_key: Vec<u8> = try!(deserialize_from(stream, Infinite));
[INFO] [stdout]     |         ----^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:324:13
[INFO] [stdout]     |
[INFO] [stdout] 324 |         let mut txid;
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:325:13
[INFO] [stdout]     |
[INFO] [stdout] 325 |         let mut vout;
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/sudoku.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         let mut grid = Sudoku::new(n);
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]    --> src/sudoku.rs:164:12
[INFO] [stdout]     |
[INFO] [stdout] 164 |     pub fn print(&self) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_sudoku_from_stdin`
[INFO] [stdout]   --> src/util.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn get_sudoku_from_stdin(dimension: usize) -> Vec<u8> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |         handle_server(&mut stream, &ctx, n, &mut rpc);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:141:21
[INFO] [stdout]     |
[INFO] [stdout] 141 |                     handle_client(&mut stream, &ctx, n, &mut rpc);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 |         serialize_into(stream, &proof, Infinite);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:277:9
[INFO] [stdout]     |
[INFO] [stdout] 277 |         serialize_into(stream, &encrypted_solution, Infinite);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:278:9
[INFO] [stdout]     |
[INFO] [stdout] 278 |         serialize_into(stream, &h_of_key, Infinite);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:289:9
[INFO] [stdout]     |
[INFO] [stdout] 289 |         serialize_into(stream, &solving_pubkey, Infinite);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:318:17
[INFO] [stdout]     |
[INFO] [stdout] 318 |                 tx.send(());
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/sudoku.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         grid.solve(&mut rng);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `ffi::Keypair`, which is not FFI-safe
[INFO] [stdout]   --> src/ffi.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |         -> *const Keypair;
[INFO] [stdout]    |            ^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> src/ffi.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Keypair;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `ffi::Keypair`, which is not FFI-safe
[INFO] [stdout]   --> src/ffi.rs:25:27
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn gen_proof(keypair: *const Keypair, h: *mut c_void,
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> src/ffi.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Keypair;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `ffi::Keypair`, which is not FFI-safe
[INFO] [stdout]   --> src/ffi.rs:30:40
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn malicious_snark_verify(keypair: *const Keypair,
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> src/ffi.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Keypair;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `ffi::Keypair`, which is not FFI-safe
[INFO] [stdout]   --> src/ffi.rs:38:40
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn prove_malicious_verify(keypair: *const Keypair, h: *mut c_void,
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> src/ffi.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Keypair;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/util.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |                 decoder.finish();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit code: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.pay_to_sudoku.b7u7yr50-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e" "/opt/rustwide/target/debug/deps/pay_to_sudoku-c53f1b8db883ed7e.44ep4ihgxjhlpvvm.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/target/debug/build/bzip2-sys-e4f2774481224baa/out" "-L" "/opt/rustwide/target/debug/build/miniz-sys-063bf03ce2b18df9/out" "-L" "/opt/rustwide/target/debug/build/rust-crypto-37ef8c866b1dd315/out" "-L" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-lmysnark" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libjsonrpc-729136e9d243c989.rlib" "/opt/rustwide/target/debug/deps/libhyper-974946f849abd9a3.rlib" "/opt/rustwide/target/debug/deps/libmime-61f255f90b7ee198.rlib" "/opt/rustwide/target/debug/deps/liblanguage_tags-ebeb949c1b3eb7b6.rlib" "/opt/rustwide/target/debug/deps/libsolicit-6000b6d5baebf7ae.rlib" "/opt/rustwide/target/debug/deps/libhpack-390b2425f3560018.rlib" "/opt/rustwide/target/debug/deps/liblog-b24c895d6073413e.rlib" "/opt/rustwide/target/debug/deps/libtypeable-0e6a72b2a88503fe.rlib" "/opt/rustwide/target/debug/deps/libtraitobject-a7240f2cd1b9f993.rlib" "/opt/rustwide/target/debug/deps/libnum_cpus-0c950805319cedb5.rlib" "/opt/rustwide/target/debug/deps/libhttparse-db44bcfcce5c5fc7.rlib" "/opt/rustwide/target/debug/deps/libunicase-f67276c085ef6154.rlib" "/opt/rustwide/target/debug/deps/libcookie-2af967d418214acc.rlib" "/opt/rustwide/target/debug/deps/liburl-303f1f6e118cc408.rlib" "/opt/rustwide/target/debug/deps/libmatches-f2d3462a09deef23.rlib" "/opt/rustwide/target/debug/deps/libuuid-577d9b3db4d48f2a.rlib" "/opt/rustwide/target/debug/deps/libcrypto-440d20064a55ef8e.rlib" "/opt/rustwide/target/debug/deps/libtime-e91b287d0b26a654.rlib" "/opt/rustwide/target/debug/deps/libstrason-ef068ed3ef963a36.rlib" "/opt/rustwide/target/debug/deps/libencoding-b5b12e2324491015.rlib" "/opt/rustwide/target/debug/deps/libencoding_index_tradchinese-ee0fdd12048e6a02.rlib" "/opt/rustwide/target/debug/deps/libencoding_index_simpchinese-968a1f9ae2bcfbc8.rlib" "/opt/rustwide/target/debug/deps/libencoding_index_japanese-84bd128bab532ece.rlib" "/opt/rustwide/target/debug/deps/libencoding_index_korean-b2956911d07fa733.rlib" "/opt/rustwide/target/debug/deps/libencoding_index_singlebyte-ff86d18d78f29952.rlib" "/opt/rustwide/target/debug/deps/libflate2-f9b4db4fce2c4e0f.rlib" "/opt/rustwide/target/debug/deps/libminiz_sys-cc33dcf0e9da3912.rlib" "/opt/rustwide/target/debug/deps/libclap-0edfbcaa1c4dfca2.rlib" "/opt/rustwide/target/debug/deps/libvec_map-5809a183588ceddf.rlib" "/opt/rustwide/target/debug/deps/libbitflags-b5157582c6925261.rlib" "/opt/rustwide/target/debug/deps/libansi_term-7bcf4cc4193635f2.rlib" "/opt/rustwide/target/debug/deps/libstrsim-c70f0508219a56c5.rlib" "/opt/rustwide/target/debug/deps/libhex-6e3644f7ae442f0c.rlib" "/opt/rustwide/target/debug/deps/libthread_scoped-5f4d40dca6087763.rlib" "/opt/rustwide/target/debug/deps/libbincode-2c01c82e9aa6bdd5.rlib" "/opt/rustwide/target/debug/deps/libserde-39b2f44d1d4f4a27.rlib" "/opt/rustwide/target/debug/deps/libnum-67273b97b54ff219.rlib" "/opt/rustwide/target/debug/deps/libnum_rational-50f1ac7da165fb7e.rlib" "/opt/rustwide/target/debug/deps/libnum_bigint-391294529fccb50f.rlib" "/opt/rustwide/target/debug/deps/librand-e2e94aae8de33e56.rlib" "/opt/rustwide/target/debug/deps/libnum_complex-85c0a8463cbb81f6.rlib" "/opt/rustwide/target/debug/deps/libnum_iter-5dccf55813d05632.rlib" "/opt/rustwide/target/debug/deps/libnum_integer-08c96ae23c654062.rlib" "/opt/rustwide/target/debug/deps/libnum_traits-91984254eaf8390f.rlib" "/opt/rustwide/target/debug/deps/libbyteorder-becb7dee96094fa0.rlib" "/opt/rustwide/target/debug/deps/librustc_serialize-5f99a5b279739150.rlib" "/opt/rustwide/target/debug/deps/liblibc-e7e5a822d178368d.rlib" "/opt/rustwide/target/debug/deps/libwhiteread-9f1f23ce908856d2.rlib" "-Wl,--start-group" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-f14aca24435a5414.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-48d342a8b48d1d01.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-14bc0820888c8eb3.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-9cbd9e217bff06bc.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-31826136df98934e.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-075976a117c8fd5d.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-2d5cbedfbf17a011.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-0474372ff08c5319.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-d437c34460d2315a.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-fb61ed1b8cc4de79.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-bf76d1b643bfc9f0.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-a1b53aa7fddcf418.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-28585e57fac45c73.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-64801769bc15ab28.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-541997b56bb98660.rlib" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-cdea3c81adab3d12.rlib" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/1.47.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-cd9f15a39fb65cbc.rlib" "-Wl,-Bdynamic" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil"
[INFO] [stdout]   = note: /usr/bin/ld: cannot find -lmysnark
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 46 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pay-to-sudoku`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "3280da0a74e02a05ba899a86fbbceebb6b36141cde64480cb0d7c473a6ec722a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3280da0a74e02a05ba899a86fbbceebb6b36141cde64480cb0d7c473a6ec722a", kill_on_drop: false }`
[INFO] [stdout] 3280da0a74e02a05ba899a86fbbceebb6b36141cde64480cb0d7c473a6ec722a
