[INFO] cloning repository https://github.com/polyesterswing/rust-chip8 [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/polyesterswing/rust-chip8" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpolyesterswing%2Frust-chip8", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpolyesterswing%2Frust-chip8'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] a9fc250a7fa3c8ff9e40cf7a3b507665e58976d7 [INFO] testing polyesterswing/rust-chip8 against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpolyesterswing%2Frust-chip8" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/polyesterswing/rust-chip8 [INFO] finished tweaking git repo https://github.com/polyesterswing/rust-chip8 [INFO] tweaked toml for git repo https://github.com/polyesterswing/rust-chip8 written to /workspace/builds/worker-2-tc2/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/polyesterswing/rust-chip8 on toolchain b83b707f97d809763b7861afa7638871f3339a33 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/polyesterswing/rust-chip8 already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] ea540e18b699214cef8673762efbbe7afa037ed4cd5e10cfac11ca0c75fbc83a [INFO] running `Command { std: "docker" "start" "-a" "ea540e18b699214cef8673762efbbe7afa037ed4cd5e10cfac11ca0c75fbc83a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "ea540e18b699214cef8673762efbbe7afa037ed4cd5e10cfac11ca0c75fbc83a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ea540e18b699214cef8673762efbbe7afa037ed4cd5e10cfac11ca0c75fbc83a", kill_on_drop: false }` [INFO] [stdout] ea540e18b699214cef8673762efbbe7afa037ed4cd5e10cfac11ca0c75fbc83a [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 07fdd622a2c777f57d92a60b8413449ab7f4e4390e77fd5b67b98fffd3c8f5cb [INFO] running `Command { std: "docker" "start" "-a" "07fdd622a2c777f57d92a60b8413449ab7f4e4390e77fd5b67b98fffd3c8f5cb", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.103 [INFO] [stderr] Compiling cfg-if v0.1.10 [INFO] [stderr] Compiling version-compare v0.0.10 [INFO] [stderr] Compiling getrandom v0.1.16 [INFO] [stderr] Compiling cfg-if v1.0.0 [INFO] [stderr] Compiling sdl2 v0.34.5 [INFO] [stderr] Compiling ppv-lite86 v0.2.14 [INFO] [stderr] Compiling bitflags v1.3.2 [INFO] [stderr] Compiling lazy_static v1.4.0 [INFO] [stderr] Compiling sdl2-sys v0.34.5 [INFO] [stderr] Compiling rand_core v0.5.1 [INFO] [stderr] Compiling rand_chacha v0.2.2 [INFO] [stderr] Compiling rand v0.7.3 [INFO] [stderr] Compiling chip8 v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::io` [INFO] [stdout] --> src/chip8.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::io; [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chip8.rs:220:32 [INFO] [stdout] | [INFO] [stdout] 220 | Instruction::SKUP {s} => { [INFO] [stdout] | ^ help: try ignoring the field: `s: _` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `keys` [INFO] [stdout] --> src/main.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let keys = [ [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `keycode` [INFO] [stdout] --> src/main.rs:78:33 [INFO] [stdout] | [INFO] [stdout] 78 | Event::KeyDown {keycode, ..} => { [INFO] [stdout] | ^^^^^^^- [INFO] [stdout] | | [INFO] [stdout] | help: try removing the field [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `s` and `t` are never read [INFO] [stdout] --> src/chip8.rs:40:12 [INFO] [stdout] | [INFO] [stdout] 40 | SUB {s: u8, t: u8}, [INFO] [stdout] | --- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `s` and `t` are never read [INFO] [stdout] --> src/chip8.rs:41:12 [INFO] [stdout] | [INFO] [stdout] 41 | SHR {s: u8, t: u8}, [INFO] [stdout] | --- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `s` and `t` are never read [INFO] [stdout] --> src/chip8.rs:42:12 [INFO] [stdout] | [INFO] [stdout] 42 | SHL {s: u8, t: u8}, [INFO] [stdout] | --- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `I` should have a snake case name [INFO] [stdout] --> src/chip8.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | pub I: u16, [INFO] [stdout] | ^ help: convert the identifier to snake case (notice the capitalization): `i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.63s [INFO] running `Command { std: "docker" "inspect" "07fdd622a2c777f57d92a60b8413449ab7f4e4390e77fd5b67b98fffd3c8f5cb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "07fdd622a2c777f57d92a60b8413449ab7f4e4390e77fd5b67b98fffd3c8f5cb", kill_on_drop: false }` [INFO] [stdout] 07fdd622a2c777f57d92a60b8413449ab7f4e4390e77fd5b67b98fffd3c8f5cb [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 1c7cd96ef51934c847fc22b457eb56ebd47702133b86cb421ec93f77a8b23384 [INFO] running `Command { std: "docker" "start" "-a" "1c7cd96ef51934c847fc22b457eb56ebd47702133b86cb421ec93f77a8b23384", kill_on_drop: false }` [INFO] [stderr] Compiling chip8 v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::io` [INFO] [stdout] --> src/chip8.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::io; [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chip8.rs:220:32 [INFO] [stdout] | [INFO] [stdout] 220 | Instruction::SKUP {s} => { [INFO] [stdout] | ^ help: try ignoring the field: `s: _` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `keys` [INFO] [stdout] --> src/main.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let keys = [ [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `keycode` [INFO] [stdout] --> src/main.rs:78:33 [INFO] [stdout] | [INFO] [stdout] 78 | Event::KeyDown {keycode, ..} => { [INFO] [stdout] | ^^^^^^^- [INFO] [stdout] | | [INFO] [stdout] | help: try removing the field [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `s` and `t` are never read [INFO] [stdout] --> src/chip8.rs:40:12 [INFO] [stdout] | [INFO] [stdout] 40 | SUB {s: u8, t: u8}, [INFO] [stdout] | --- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `s` and `t` are never read [INFO] [stdout] --> src/chip8.rs:41:12 [INFO] [stdout] | [INFO] [stdout] 41 | SHR {s: u8, t: u8}, [INFO] [stdout] | --- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `s` and `t` are never read [INFO] [stdout] --> src/chip8.rs:42:12 [INFO] [stdout] | [INFO] [stdout] 42 | SHL {s: u8, t: u8}, [INFO] [stdout] | --- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `I` should have a snake case name [INFO] [stdout] --> src/chip8.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | pub I: u16, [INFO] [stdout] | ^ help: convert the identifier to snake case (notice the capitalization): `i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.37s [INFO] running `Command { std: "docker" "inspect" "1c7cd96ef51934c847fc22b457eb56ebd47702133b86cb421ec93f77a8b23384", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1c7cd96ef51934c847fc22b457eb56ebd47702133b86cb421ec93f77a8b23384", kill_on_drop: false }` [INFO] [stdout] 1c7cd96ef51934c847fc22b457eb56ebd47702133b86cb421ec93f77a8b23384 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] a5b4277787019b47a110ffe4fb9f5e97747a21dcf5175c6398fac3230798f0f7 [INFO] running `Command { std: "docker" "start" "-a" "a5b4277787019b47a110ffe4fb9f5e97747a21dcf5175c6398fac3230798f0f7", kill_on_drop: false }` [INFO] [stderr] warning: unused import: `std::io` [INFO] [stderr] --> src/chip8.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use std::io; [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/chip8.rs:220:32 [INFO] [stderr] | [INFO] [stderr] 220 | Instruction::SKUP {s} => { [INFO] [stderr] | ^ help: try ignoring the field: `s: _` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `keys` [INFO] [stderr] --> src/main.rs:11:9 [INFO] [stderr] | [INFO] [stderr] 11 | let keys = [ [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_keys` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `keycode` [INFO] [stderr] --> src/main.rs:78:33 [INFO] [stderr] | [INFO] [stderr] 78 | Event::KeyDown {keycode, ..} => { [INFO] [stderr] | ^^^^^^^- [INFO] [stderr] | | [INFO] [stderr] | help: try removing the field [INFO] [stderr] [INFO] [stderr] warning: fields `s` and `t` are never read [INFO] [stderr] --> src/chip8.rs:40:12 [INFO] [stderr] | [INFO] [stderr] 40 | SUB {s: u8, t: u8}, [INFO] [stderr] | --- ^ ^ [INFO] [stderr] | | [INFO] [stderr] | fields in this variant [INFO] [stderr] | [INFO] [stderr] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stderr] [INFO] [stderr] warning: fields `s` and `t` are never read [INFO] [stderr] --> src/chip8.rs:41:12 [INFO] [stderr] | [INFO] [stderr] 41 | SHR {s: u8, t: u8}, [INFO] [stderr] | --- ^ ^ [INFO] [stderr] | | [INFO] [stderr] | fields in this variant [INFO] [stderr] | [INFO] [stderr] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] [INFO] [stderr] warning: fields `s` and `t` are never read [INFO] [stderr] --> src/chip8.rs:42:12 [INFO] [stderr] | [INFO] [stderr] 42 | SHL {s: u8, t: u8}, [INFO] [stderr] | --- ^ ^ [INFO] [stderr] | | [INFO] [stderr] | fields in this variant [INFO] [stderr] | [INFO] [stderr] = note: `Instruction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] [INFO] [stderr] warning: structure field `I` should have a snake case name [INFO] [stderr] --> src/chip8.rs:14:9 [INFO] [stderr] | [INFO] [stderr] 14 | pub I: u16, [INFO] [stderr] | ^ help: convert the identifier to snake case (notice the capitalization): `i` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default [INFO] [stderr] [INFO] [stderr] warning: `chip8` (bin "chip8" test) generated 8 warnings (run `cargo fix --bin "chip8" --tests` to apply 2 suggestions) [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stderr] Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chip8-24d4efdb6ef9c907) [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" "a5b4277787019b47a110ffe4fb9f5e97747a21dcf5175c6398fac3230798f0f7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a5b4277787019b47a110ffe4fb9f5e97747a21dcf5175c6398fac3230798f0f7", kill_on_drop: false }` [INFO] [stdout] a5b4277787019b47a110ffe4fb9f5e97747a21dcf5175c6398fac3230798f0f7