[INFO] cloning repository https://github.com/aaronriekenberg/rust_hyper
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aaronriekenberg/rust_hyper" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faaronriekenberg%2Frust_hyper"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faaronriekenberg%2Frust_hyper'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cc5295d21f886189d8d546472ee458c413dc6f3e
[INFO] checking aaronriekenberg/rust_hyper against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faaronriekenberg%2Frust_hyper" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/aaronriekenberg/rust_hyper on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/aaronriekenberg/rust_hyper
[INFO] finished tweaking git repo https://github.com/aaronriekenberg/rust_hyper
[INFO] tweaked toml for git repo https://github.com/aaronriekenberg/rust_hyper written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/aaronriekenberg/rust_hyper already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5a3d01abf21509cb7a2ca2d92d3cca93784b3caa2987750ffb195c6210bfb3b1
[INFO] running `"docker" "start" "-a" "5a3d01abf21509cb7a2ca2d92d3cca93784b3caa2987750ffb195c6210bfb3b1"`
[INFO] [stderr]     Checking horrorshow v0.6.4
[INFO] [stderr]     Checking fern v0.5.7
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking tokio-io v0.1.10
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking tokio-threadpool v0.1.9
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking h2 v0.1.14
[INFO] [stderr]     Checking tokio-reactor v0.1.7
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking tokio-fs v0.1.4
[INFO] [stderr]     Checking tokio-uds v0.2.4
[INFO] [stderr]     Checking tokio-udp v0.1.3
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]     Checking tokio-signal v0.2.7
[INFO] [stderr]     Checking tokio v0.1.13
[INFO] [stderr]     Checking tokio-process v0.2.3
[INFO] [stderr]     Checking hyper v0.12.19
[INFO] [stderr]     Checking rust_hyper v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/config.rs:153:70
[INFO] [stderr]     |
[INFO] [stderr] 153 | pub fn read_config(config_file: String) -> Result<Configuration, Box<::std::error::Error>> {
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[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/environment.rs:17:41
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn get_git_hash() -> Result<String, Box<::std::error::Error>> {
[INFO] [stderr]    |                                         ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/environment.rs:37:53
[INFO] [stderr]    |
[INFO] [stderr] 37 | pub fn get_environment() -> Result<Environment, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                     ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/command/api.rs:21:14
[INFO] [stderr]    |
[INFO] [stderr] 21 |     ) -> Box<Future<Item = String, Error = crate::server::HandlerError> + Send> {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = String, Error = crate::server::HandlerError> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/command/html.rs:17:78
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new(command_info: crate::config::CommandInfo) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                                              ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/index.rs:19:27
[INFO] [stderr]    |
[INFO] [stderr] 19 |     ) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/proxy/api.rs:27:14
[INFO] [stderr]    |
[INFO] [stderr] 27 |     ) -> Box<Future<Item = ResponseInfo, Error = crate::server::HandlerError> + Send> {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ResponseInfo, Error = crate::server::HandlerError> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/proxy/api.rs:68:74
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn new(proxy_info: crate::config::ProxyInfo) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/proxy/html.rs:17:74
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new(proxy_info: crate::config::ProxyInfo) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/static_file.rs:21:27
[INFO] [stderr]    |
[INFO] [stderr] 21 |     ) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/static_file.rs:89:10
[INFO] [stderr]    |
[INFO] [stderr] 89 | ) -> Box<Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send> {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/handlers/static_file.rs:111:10
[INFO] [stderr]     |
[INFO] [stderr] 111 | ) -> Box<Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/logging.rs:47:47
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn initialize_logging() -> Result<(), Box<::std::error::Error>> {
[INFO] [stderr]    |                                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/server.rs:126:32
[INFO] [stderr]     |
[INFO] [stderr] 126 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stderr]     |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/server.rs:135:9
[INFO] [stderr]     |
[INFO] [stderr] 135 |     Box<Future<Item = ::hyper::Response<::hyper::Body>, Error = HandlerError> + Send>;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ::hyper::Response<::hyper::Body>, Error = HandlerError> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/server.rs:276:21
[INFO] [stderr]     |
[INFO] [stderr] 276 | ) -> Result<(), Box<error::Error>> {
[INFO] [stderr]     |                     ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:20:45
[INFO] [stderr]    |
[INFO] [stderr] 20 | ) -> Result<server::RouteConfiguration, Box<std::error::Error>> {
[INFO] [stderr]    |                                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:67:46
[INFO] [stderr]    |
[INFO] [stderr] 67 | ) -> Result<server::ServerConfiguration, Box<std::error::Error>> {
[INFO] [stderr]    |                                              ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/config.rs:153:70
[INFO] [stderr]     |
[INFO] [stderr] 153 | pub fn read_config(config_file: String) -> Result<Configuration, Box<::std::error::Error>> {
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[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/environment.rs:17:41
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn get_git_hash() -> Result<String, Box<::std::error::Error>> {
[INFO] [stderr]    |                                         ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/environment.rs:37:53
[INFO] [stderr]    |
[INFO] [stderr] 37 | pub fn get_environment() -> Result<Environment, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                     ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/command/api.rs:21:14
[INFO] [stderr]    |
[INFO] [stderr] 21 |     ) -> Box<Future<Item = String, Error = crate::server::HandlerError> + Send> {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = String, Error = crate::server::HandlerError> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/command/html.rs:17:78
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new(command_info: crate::config::CommandInfo) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                                              ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/index.rs:19:27
[INFO] [stderr]    |
[INFO] [stderr] 19 |     ) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/proxy/api.rs:27:14
[INFO] [stderr]    |
[INFO] [stderr] 27 |     ) -> Box<Future<Item = ResponseInfo, Error = crate::server::HandlerError> + Send> {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ResponseInfo, Error = crate::server::HandlerError> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/proxy/api.rs:68:74
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn new(proxy_info: crate::config::ProxyInfo) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/proxy/html.rs:17:74
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new(proxy_info: crate::config::ProxyInfo) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/static_file.rs:21:27
[INFO] [stderr]    |
[INFO] [stderr] 21 |     ) -> Result<Self, Box<::std::error::Error>> {
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/handlers/static_file.rs:89:10
[INFO] [stderr]    |
[INFO] [stderr] 89 | ) -> Box<Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send> {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/handlers/static_file.rs:111:10
[INFO] [stderr]     |
[INFO] [stderr] 111 | ) -> Box<Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ::hyper::Response<::hyper::Body>, Error = ::std::io::Error> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/logging.rs:47:47
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn initialize_logging() -> Result<(), Box<::std::error::Error>> {
[INFO] [stderr]    |                                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/server.rs:126:32
[INFO] [stderr]     |
[INFO] [stderr] 126 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stderr]     |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/server.rs:135:9
[INFO] [stderr]     |
[INFO] [stderr] 135 |     Box<Future<Item = ::hyper::Response<::hyper::Body>, Error = HandlerError> + Send>;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future<Item = ::hyper::Response<::hyper::Body>, Error = HandlerError> + Send`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/server.rs:276:21
[INFO] [stderr]     |
[INFO] [stderr] 276 | ) -> Result<(), Box<error::Error>> {
[INFO] [stderr]     |                     ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:20:45
[INFO] [stderr]    |
[INFO] [stderr] 20 | ) -> Result<server::RouteConfiguration, Box<std::error::Error>> {
[INFO] [stderr]    |                                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:67:46
[INFO] [stderr]    |
[INFO] [stderr] 67 | ) -> Result<server::ServerConfiguration, Box<std::error::Error>> {
[INFO] [stderr]    |                                              ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.99s
[INFO] running `"docker" "inspect" "5a3d01abf21509cb7a2ca2d92d3cca93784b3caa2987750ffb195c6210bfb3b1"`
[INFO] running `"docker" "rm" "-f" "5a3d01abf21509cb7a2ca2d92d3cca93784b3caa2987750ffb195c6210bfb3b1"`
[INFO] [stdout] 5a3d01abf21509cb7a2ca2d92d3cca93784b3caa2987750ffb195c6210bfb3b1