[INFO] cloning repository https://github.com/peter-wilkins-mayden/mal-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/peter-wilkins-mayden/mal-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeter-wilkins-mayden%2Fmal-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeter-wilkins-mayden%2Fmal-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e74e436326984f33f144238c6a6ae6619b453a19
[INFO] testing peter-wilkins-mayden/mal-rust against try#8262275854dc0e5381c9d42d56257d94932c5a87 for pr-90799
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeter-wilkins-mayden%2Fmal-rust" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/peter-wilkins-mayden/mal-rust on toolchain 8262275854dc0e5381c9d42d56257d94932c5a87
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/peter-wilkins-mayden/mal-rust
[INFO] finished tweaking git repo https://github.com/peter-wilkins-mayden/mal-rust
[INFO] tweaked toml for git repo https://github.com/peter-wilkins-mayden/mal-rust written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/peter-wilkins-mayden/mal-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nom v4.2.3
[INFO] [stderr]   Downloaded cc v1.0.38
[INFO] [stderr]   Downloaded backtrace v0.3.33
[INFO] [stderr]   Downloaded synstructure v0.10.2
[INFO] [stderr]   Downloaded syn v0.15.42
[INFO] [stderr]   Downloaded utf8-ranges v1.0.3
[INFO] [stderr]   Downloaded linefeed v0.6.0
[INFO] [stderr]   Downloaded aho-corasick v0.7.4
[INFO] [stderr]   Downloaded ucd-util v0.1.5
[INFO] [stderr]   Downloaded regex v1.2.0
[INFO] [stderr]   Downloaded backtrace-sys v0.1.31
[INFO] [stderr]   Downloaded rustc-demangle v0.1.15
[INFO] [stderr]   Downloaded terminfo v0.6.1
[INFO] [stderr]   Downloaded smallstr v0.1.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.10
[INFO] [stderr]   Downloaded mortal v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 31343db35475840788bbd812cb8e7ca61ceba0d70337ecb900077f49856ea1c6
[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" "31343db35475840788bbd812cb8e7ca61ceba0d70337ecb900077f49856ea1c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "31343db35475840788bbd812cb8e7ca61ceba0d70337ecb900077f49856ea1c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31343db35475840788bbd812cb8e7ca61ceba0d70337ecb900077f49856ea1c6", kill_on_drop: false }`
[INFO] [stdout] 31343db35475840788bbd812cb8e7ca61ceba0d70337ecb900077f49856ea1c6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "build" "--frozen" "--message-format=json", 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] 8f9b5d41f7319b300c3f3ebcc572f7776c774e915d935be4127d2218101baff8
[INFO] running `Command { std: "docker" "start" "-a" "8f9b5d41f7319b300c3f3ebcc572f7776c774e915d935be4127d2218101baff8", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling smallstr v0.1.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.8
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling regex v1.2.0
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling terminfo v0.6.1
[INFO] [stderr]    Compiling mortal v0.2.1
[INFO] [stderr]    Compiling linefeed v0.6.0
[INFO] [stderr]    Compiling mal-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/reader.rs:46:28
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/reader.rs:46:41
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout]    |                                         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unescape_str`
[INFO] [stdout]    --> src/reader.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn unescape_str(s: &str) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `MalType`
[INFO] [stdout]  --> src/bin/step1_read_print.rs:6:23
[INFO] [stdout]   |
[INFO] [stdout] 6 | use mal_rust::types::{MalType, MalErr};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.45s
[INFO] running `Command { std: "docker" "inspect" "8f9b5d41f7319b300c3f3ebcc572f7776c774e915d935be4127d2218101baff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f9b5d41f7319b300c3f3ebcc572f7776c774e915d935be4127d2218101baff8", kill_on_drop: false }`
[INFO] [stdout] 8f9b5d41f7319b300c3f3ebcc572f7776c774e915d935be4127d2218101baff8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] baa24e6b118ddb695a1c52310ac4aaab3b4c47f0ea84f671c25845f0b7cdb128
[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" "baa24e6b118ddb695a1c52310ac4aaab3b4c47f0ea84f671c25845f0b7cdb128", kill_on_drop: false }`
[INFO] [stderr]    Compiling mal-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/reader.rs:46:28
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/reader.rs:46:41
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout]    |                                         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unescape_str`
[INFO] [stdout]    --> src/reader.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn unescape_str(s: &str) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `MalType`
[INFO] [stdout]  --> src/bin/step1_read_print.rs:6:23
[INFO] [stdout]   |
[INFO] [stdout] 6 | use mal_rust::types::{MalType, MalErr};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/reader.rs:46:28
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/reader.rs:46:41
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout]    |                                         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unescape_str`
[INFO] [stdout]    --> src/reader.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn unescape_str(s: &str) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.67s
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "baa24e6b118ddb695a1c52310ac4aaab3b4c47f0ea84f671c25845f0b7cdb128", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "baa24e6b118ddb695a1c52310ac4aaab3b4c47f0ea84f671c25845f0b7cdb128", kill_on_drop: false }`
[INFO] [stdout] baa24e6b118ddb695a1c52310ac4aaab3b4c47f0ea84f671c25845f0b7cdb128
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 47d2e0750b872ea227e15ce76239e1eff22e6ae1cd15ef5d94ff7be2c297b310
[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" "47d2e0750b872ea227e15ce76239e1eff22e6ae1cd15ef5d94ff7be2c297b310", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `start`
[INFO] [stdout] running 0 tests
[INFO] [stderr]   --> src/reader.rs:46:28
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout] 
[INFO] [stderr]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] running 0 tests
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] warning: unused variable: `end`
[INFO] [stdout] 
[INFO] [stderr]   --> src/reader.rs:46:41
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] running 0 tests
[INFO] [stderr] 46 |     fn read_seq(&mut self, start: &str, end: &str) -> Result<MalType, MalErr> {
[INFO] [stdout] 
[INFO] [stderr]    |                                         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: function is never used: `unescape_str`
[INFO] [stderr]    --> src/reader.rs:100:4
[INFO] [stderr]     |
[INFO] [stderr] 100 | fn unescape_str(s: &str) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `mal-rust` (lib) generated 3 warnings
[INFO] [stderr] warning: `mal-rust` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr] warning: unused import: `MalType`
[INFO] [stderr]  --> src/bin/step1_read_print.rs:6:23
[INFO] [stderr]   |
[INFO] [stderr] 6 | use mal_rust::types::{MalType, MalErr};
[INFO] [stderr]   |                       ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `mal-rust` (bin "step1_read_print" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mal_rust-e260b17908d2726d)
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/step0_repl-1fb5bb3484ab7cba)
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/step1_read_print-407caf8026da53eb)
[INFO] [stderr]    Doc-tests mal-rust
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "47d2e0750b872ea227e15ce76239e1eff22e6ae1cd15ef5d94ff7be2c297b310", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47d2e0750b872ea227e15ce76239e1eff22e6ae1cd15ef5d94ff7be2c297b310", kill_on_drop: false }`
[INFO] [stdout] 47d2e0750b872ea227e15ce76239e1eff22e6ae1cd15ef5d94ff7be2c297b310