[INFO] cloning repository https://github.com/balliegojr/iron-carrier [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/balliegojr/iron-carrier" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fballiegojr%2Firon-carrier", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fballiegojr%2Firon-carrier'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 9fcf9f41d1da57f797d66b860f1ed7d5c895c4e2 [INFO] checking balliegojr/iron-carrier against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fballiegojr%2Firon-carrier" "/workspace/builds/worker-5/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/balliegojr/iron-carrier on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/balliegojr/iron-carrier [INFO] finished tweaking git repo https://github.com/balliegojr/iron-carrier [INFO] tweaked toml for git repo https://github.com/balliegojr/iron-carrier written to /workspace/builds/worker-5/source/Cargo.toml [INFO] crate git repo https://github.com/balliegojr/iron-carrier already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 8a474e9a1eb700f8d58cff2e43fdb041f732ae655b6d133dde80f5be4cc500d5 [INFO] running `Command { std: "docker" "start" "-a" "8a474e9a1eb700f8d58cff2e43fdb041f732ae655b6d133dde80f5be4cc500d5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "8a474e9a1eb700f8d58cff2e43fdb041f732ae655b6d133dde80f5be4cc500d5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8a474e9a1eb700f8d58cff2e43fdb041f732ae655b6d133dde80f5be4cc500d5", kill_on_drop: false }` [INFO] [stdout] 8a474e9a1eb700f8d58cff2e43fdb041f732ae655b6d133dde80f5be4cc500d5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] e4e6b7599004473016ec8b508b69adb2af27537e7b55cef3cadb713ecd4693a3 [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" "e4e6b7599004473016ec8b508b69adb2af27537e7b55cef3cadb713ecd4693a3", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.79 [INFO] [stderr] Compiling proc-macro2 v1.0.24 [INFO] [stderr] Compiling unicode-xid v0.2.1 [INFO] [stderr] Compiling syn v1.0.44 [INFO] [stderr] Checking cfg-if v0.1.10 [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling log v0.4.11 [INFO] [stderr] Compiling memchr v2.3.3 [INFO] [stderr] Compiling pin-project-internal v0.4.27 [INFO] [stderr] Checking slab v0.4.2 [INFO] [stderr] Compiling bitflags v1.2.1 [INFO] [stderr] Compiling proc-macro-nested v0.1.6 [INFO] [stderr] Checking once_cell v1.5.2 [INFO] [stderr] Checking futures-core v0.3.6 [INFO] [stderr] Checking futures-sink v0.3.6 [INFO] [stderr] Compiling byteorder v1.3.4 [INFO] [stderr] Checking pin-utils v0.1.0 [INFO] [stderr] Checking scopeguard v1.1.0 [INFO] [stderr] Checking futures-io v0.3.6 [INFO] [stderr] Checking lazy_static v1.4.0 [INFO] [stderr] Checking same-file v1.0.6 [INFO] [stderr] Checking pin-project-lite v0.2.0 [INFO] [stderr] Checking termcolor v1.1.2 [INFO] [stderr] Checking strsim v0.8.0 [INFO] [stderr] Checking bytes v1.0.0 [INFO] [stderr] Checking vec_map v0.8.2 [INFO] [stderr] Checking ansi_term v0.11.0 [INFO] [stderr] Checking bytes v0.5.6 [INFO] [stderr] Checking instant v0.1.7 [INFO] [stderr] Checking futures-task v0.3.6 [INFO] [stderr] Checking futures-channel v0.3.6 [INFO] [stderr] Checking lock_api v0.4.1 [INFO] [stderr] Checking thread_local v1.0.1 [INFO] [stderr] Checking walkdir v2.3.1 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Compiling num-integer v0.1.44 [INFO] [stderr] Compiling tokio v1.0.1 [INFO] [stderr] Compiling quote v1.0.7 [INFO] [stderr] Checking net2 v0.2.35 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking parking_lot_core v0.8.0 [INFO] [stderr] Checking time v0.1.44 [INFO] [stderr] Checking inotify-sys v0.1.3 [INFO] [stderr] Checking mio v0.7.6 [INFO] [stderr] Checking num_cpus v1.13.0 [INFO] [stderr] Checking signal-hook-registry v1.2.1 [INFO] [stderr] Checking filetime v0.2.12 [INFO] [stderr] Checking clap v2.33.3 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Checking parking_lot v0.11.0 [INFO] [stderr] Checking mio v0.6.22 [INFO] [stderr] Checking chrono v0.4.19 [INFO] [stderr] Checking mio-extras v2.0.6 [INFO] [stderr] Checking notify v4.0.15 [INFO] [stderr] Checking stderrlog v0.5.0 [INFO] [stderr] Compiling futures-macro v0.3.6 [INFO] [stderr] Compiling serde_derive v1.0.116 [INFO] [stderr] Compiling tokio-macros v1.0.0 [INFO] [stderr] Checking pin-project v0.4.27 [INFO] [stderr] Checking futures-util v0.3.6 [INFO] [stderr] Checking serde v1.0.116 [INFO] [stderr] Checking futures-executor v0.3.6 [INFO] [stderr] Checking futures v0.3.6 [INFO] [stderr] Checking toml v0.5.6 [INFO] [stderr] Checking bincode v1.3.1 [INFO] [stderr] Checking iron-carrier v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: associated function is never used: `send_server_port` [INFO] [stdout] --> src/network/peer.rs:162:14 [INFO] [stdout] | [INFO] [stdout] 162 | async fn send_server_port(&mut self) -> crate::Result<()> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `send_server_port` [INFO] [stdout] --> src/network/peer.rs:162:14 [INFO] [stdout] | [INFO] [stdout] 162 | async fn send_server_port(&mut self) -> crate::Result<()> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a module [INFO] [stdout] --> src/sync/mod.rs:5:1 [INFO] [stdout] | [INFO] [stdout] 5 | pub mod synchronizer; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: the lint level is defined here [INFO] [stdout] --> src/lib.rs:1:9 [INFO] [stdout] | [INFO] [stdout] 1 | #![warn(missing_docs)] [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a struct [INFO] [stdout] --> src/sync/synchronizer.rs:7:1 [INFO] [stdout] | [INFO] [stdout] 7 | pub struct Synchronizer { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for an associated function [INFO] [stdout] --> src/sync/synchronizer.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | pub fn new(config: Config) -> Self { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `std::result::Result` that must be used [INFO] [stdout] --> src/network/server/server_peer_handler.rs:121:29 [INFO] [stdout] | [INFO] [stdout] 121 | / ... events_blocker [INFO] [stdout] 122 | | ... .send((file_path, self.socket_addr.clone())) [INFO] [stdout] 123 | | ... .await; [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/network/server/server_peer_handler.rs:160:25 [INFO] [stdout] | [INFO] [stdout] 160 | / events_blocker [INFO] [stdout] 161 | | .send((file_path, self.socket_addr.clone())) [INFO] [stdout] 162 | | .await; [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/network/server/server_peer_handler.rs:179:25 [INFO] [stdout] | [INFO] [stdout] 179 | / events_blocker [INFO] [stdout] 180 | | .send((file_path, self.socket_addr.clone())) [INFO] [stdout] 181 | | .await; [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: missing documentation for an associated function [INFO] [stdout] --> src/sync/synchronizer.rs:33:5 [INFO] [stdout] | [INFO] [stdout] 33 | pub async fn start(&mut self) -> crate::Result<()> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a type alias [INFO] [stdout] --> src/sync/mod.rs:14:1 [INFO] [stdout] | [INFO] [stdout] 14 | pub type BlockingEvent = (PathBuf, String); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for an enum [INFO] [stdout] --> src/sync/mod.rs:30:1 [INFO] [stdout] | [INFO] [stdout] 30 | pub enum FileAction { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a variant [INFO] [stdout] --> src/sync/mod.rs:31:5 [INFO] [stdout] | [INFO] [stdout] 31 | Create(FileInfo), [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a variant [INFO] [stdout] --> src/sync/mod.rs:32:5 [INFO] [stdout] | [INFO] [stdout] 32 | Update(FileInfo), [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a variant [INFO] [stdout] --> src/sync/mod.rs:33:5 [INFO] [stdout] | [INFO] [stdout] 33 | Move(FileInfo, FileInfo), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a variant [INFO] [stdout] --> src/sync/mod.rs:34:5 [INFO] [stdout] | [INFO] [stdout] 34 | Remove(FileInfo), [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a variant [INFO] [stdout] --> src/sync/mod.rs:35:5 [INFO] [stdout] | [INFO] [stdout] 35 | Request(FileInfo), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: missing documentation for a function [INFO] [stdout] --> src/lib.rs:119:1 [INFO] [stdout] | [INFO] [stdout] 119 | pub async fn run(config: config::Config) -> Result<()> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `std::result::Result` that must be used [INFO] [stdout] --> src/sync/file_watcher.rs:179:13 [INFO] [stdout] | [INFO] [stdout] 179 | DeletionTracker::new(&root).remove_entry(&file.path).await; [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/sync/file_watcher.rs:199:13 [INFO] [stdout] | [INFO] [stdout] 199 | DeletionTracker::new(&root).add_entry(&file.path).await; [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/sync/file_watcher.rs:218:13 [INFO] [stdout] | [INFO] [stdout] 218 | DeletionTracker::new(&root).add_entry(&src_file.path).await; [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/sync/synchronizer.rs:38:9 [INFO] [stdout] | [INFO] [stdout] 38 | self.file_watcher.start(); [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: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `std::result::Result` that must be used [INFO] [stdout] --> src/network/server/server_peer_handler.rs:121:29 [INFO] [stdout] | [INFO] [stdout] 121 | / ... events_blocker [INFO] [stdout] 122 | | ... .send((file_path, self.socket_addr.clone())) [INFO] [stdout] 123 | | ... .await; [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/network/server/server_peer_handler.rs:160:25 [INFO] [stdout] | [INFO] [stdout] 160 | / events_blocker [INFO] [stdout] 161 | | .send((file_path, self.socket_addr.clone())) [INFO] [stdout] 162 | | .await; [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/network/server/server_peer_handler.rs:179:25 [INFO] [stdout] | [INFO] [stdout] 179 | / events_blocker [INFO] [stdout] 180 | | .send((file_path, self.socket_addr.clone())) [INFO] [stdout] 181 | | .await; [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/sync/file_watcher.rs:179:13 [INFO] [stdout] | [INFO] [stdout] 179 | DeletionTracker::new(&root).remove_entry(&file.path).await; [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/sync/file_watcher.rs:199:13 [INFO] [stdout] | [INFO] [stdout] 199 | DeletionTracker::new(&root).add_entry(&file.path).await; [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/sync/file_watcher.rs:218:13 [INFO] [stdout] | [INFO] [stdout] 218 | DeletionTracker::new(&root).add_entry(&src_file.path).await; [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/sync/synchronizer.rs:38:9 [INFO] [stdout] | [INFO] [stdout] 38 | self.file_watcher.start(); [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: 20 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1m 00s [INFO] running `Command { std: "docker" "inspect" "e4e6b7599004473016ec8b508b69adb2af27537e7b55cef3cadb713ecd4693a3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e4e6b7599004473016ec8b508b69adb2af27537e7b55cef3cadb713ecd4693a3", kill_on_drop: false }` [INFO] [stdout] e4e6b7599004473016ec8b508b69adb2af27537e7b55cef3cadb713ecd4693a3