[INFO] fetching crate uniswap-v2-core 0.1.1...
[INFO] testing uniswap-v2-core-0.1.1 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate uniswap-v2-core 0.1.1 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate uniswap-v2-core 0.1.1
[INFO] finished tweaking crates.io crate uniswap-v2-core 0.1.1
[INFO] tweaked toml for crates.io crate uniswap-v2-core 0.1.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate uniswap-v2-core 0.1.1 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 430 packages to latest compatible versions
[INFO] [stderr]       Adding solang-parser v0.3.3 (available: v0.3.5)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ethers v2.0.14
[INFO] [stderr]   Downloaded send_wrapper v0.4.0
[INFO] [stderr]   Downloaded zip v0.6.6
[INFO] [stderr]   Downloaded ethers-addressbook v2.0.14
[INFO] [stderr]   Downloaded svm-rs v0.3.5
[INFO] [stderr]   Downloaded utfx v0.1.0
[INFO] [stderr]   Downloaded futures-locks v0.7.1
[INFO] [stderr]   Downloaded registry v1.3.0
[INFO] [stderr]   Downloaded ether-rpc v0.1.0
[INFO] [stderr]   Downloaded ethers-core v2.0.14
[INFO] [stderr]   Downloaded ethers-contract-abigen v2.0.14
[INFO] [stderr]   Downloaded ws_stream_wasm v0.7.5
[INFO] [stderr]   Downloaded ethers-providers v2.0.14
[INFO] [stderr]   Downloaded const-hex v1.17.0
[INFO] [stderr]   Downloaded solang-parser v0.3.3
[INFO] [stderr]   Downloaded password-hash v0.4.2
[INFO] [stderr]   Downloaded ethers-contract v2.0.14
[INFO] [stderr]   Downloaded ethers-middleware v2.0.14
[INFO] [stderr]   Downloaded pharos v0.5.3
[INFO] [stderr]   Downloaded scrypt v0.10.0
[INFO] [stderr]   Downloaded async_io_stream v0.3.3
[INFO] [stderr]   Downloaded open-fastrlp v0.1.4
[INFO] [stderr]   Downloaded rlp-derive v0.1.0
[INFO] [stderr]   Downloaded eth-keystore v0.5.0
[INFO] [stderr]   Downloaded ethers-signers v2.0.14
[INFO] [stderr]   Downloaded open-fastrlp-derive v0.1.1
[INFO] [stderr]   Downloaded hashers v1.0.1
[INFO] [stderr]   Downloaded ethers-solc v2.0.14
[INFO] [stderr]   Downloaded path-slash v0.2.1
[INFO] [stderr]   Downloaded indenter v0.3.4
[INFO] [stderr]   Downloaded ethers-contract-derive v2.0.14
[INFO] [stderr]   Downloaded ethers-etherscan v2.0.14
[INFO] [stderr]   Downloaded enr v0.10.0
[INFO] [stderr]   Downloaded auto_impl v1.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0813e9b200acd2c56f0e49f2c69876657e2f77f272e2faf4783706119a35e9d5
[INFO] running `Command { std: "docker" "start" "-a" "0813e9b200acd2c56f0e49f2c69876657e2f77f272e2faf4783706119a35e9d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0813e9b200acd2c56f0e49f2c69876657e2f77f272e2faf4783706119a35e9d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0813e9b200acd2c56f0e49f2c69876657e2f77f272e2faf4783706119a35e9d5", kill_on_drop: false }`
[INFO] [stdout] 0813e9b200acd2c56f0e49f2c69876657e2f77f272e2faf4783706119a35e9d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54f87fcb75eb5d4dc979998b0f1d9d0081236402d6e5af5dc20f19332b5bc5f6
[INFO] running `Command { std: "docker" "start" "-a" "54f87fcb75eb5d4dc979998b0f1d9d0081236402d6e5af5dc20f19332b5bc5f6", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling toml_datetime v0.7.3
[INFO] [stderr]    Compiling toml_parser v1.0.4
[INFO] [stderr]    Compiling rustc-hex v2.1.0
[INFO] [stderr]    Compiling crunchy v0.2.4
[INFO] [stderr]    Compiling generic-array v0.14.9
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling parity-scale-codec v3.7.5
[INFO] [stderr]    Compiling byte-slice-cast v1.2.3
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling const_format_proc_macros v0.2.34
[INFO] [stderr]    Compiling zeroize v1.8.2
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling ring v0.17.14
[INFO] [stderr]    Compiling der v0.7.10
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.105
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling const-hex v1.17.0
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling ff v0.13.1
[INFO] [stderr]    Compiling toml_edit v0.23.7
[INFO] [stderr]    Compiling crypto-bigint v0.5.5
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling group v0.13.0
[INFO] [stderr]    Compiling uint v0.9.5
[INFO] [stderr]    Compiling const_format v0.2.35
[INFO] [stderr]    Compiling inout v0.1.4
[INFO] [stderr]    Compiling hmac v0.12.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling sha2 v0.10.9
[INFO] [stderr]    Compiling sha3 v0.10.8
[INFO] [stderr]    Compiling rfc6979 v0.4.0
[INFO] [stderr]    Compiling signature v2.2.0
[INFO] [stderr]    Compiling spki v0.7.3
[INFO] [stderr]    Compiling pkcs8 v0.10.2
[INFO] [stderr]    Compiling sec1 v0.7.3
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling cipher v0.4.4
[INFO] [stderr]    Compiling chrono v0.4.42
[INFO] [stderr]    Compiling fixed-hash v0.8.0
[INFO] [stderr]    Compiling proc-macro-crate v3.4.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.105
[INFO] [stderr]    Compiling windows_x86_64_gnu v0.52.6
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling thiserror v2.0.17
[INFO] [stderr]    Compiling eyre v0.6.12
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling indenter v0.3.4
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling tempfile v3.23.0
[INFO] [stderr]    Compiling elliptic-curve v0.13.8
[INFO] [stderr]    Compiling windows-targets v0.52.6
[INFO] [stderr]    Compiling time v0.3.44
[INFO] [stderr]    Compiling bs58 v0.5.1
[INFO] [stderr]    Compiling ripemd v0.1.3
[INFO] [stderr]    Compiling sha1 v0.10.6
[INFO] [stderr]    Compiling rlp-derive v0.1.0
[INFO] [stderr]    Compiling rustls-pki-types v1.13.0
[INFO] [stderr]    Compiling ecdsa v0.16.9
[INFO] [stderr]    Compiling utf-8 v0.7.6
[INFO] [stderr]    Compiling bech32 v0.9.1
[INFO] [stderr]    Compiling dunce v1.0.5
[INFO] [stderr]    Compiling pem v1.1.1
[INFO] [stderr]    Compiling windows-result v0.2.0
[INFO] [stderr]    Compiling aes v0.8.4
[INFO] [stderr]    Compiling semver v1.0.27
[INFO] [stderr]    Compiling camino v1.2.1
[INFO] [stderr]    Compiling k256 v0.13.4
[INFO] [stderr]    Compiling salsa20 v0.10.2
[INFO] [stderr]    Compiling pbkdf2 v0.11.0
[INFO] [stderr]    Compiling send_wrapper v0.4.0
[INFO] [stderr]    Compiling scrypt v0.10.0
[INFO] [stderr]    Compiling hashers v1.0.1
[INFO] [stderr]    Compiling rustls v0.21.12
[INFO] [stderr]    Compiling windows-strings v0.1.0
[INFO] [stderr]    Compiling ctr v0.9.2
[INFO] [stderr]    Compiling pbkdf2 v0.12.2
[INFO] [stderr]    Compiling simd-adler32 v0.3.7
[INFO] [stderr]    Compiling rustls v0.23.35
[INFO] [stderr]    Compiling crc32fast v1.5.0
[INFO] [stderr]    Compiling miniz_oxide v0.8.9
[INFO] [stderr]    Compiling webpki-roots v1.0.4
[INFO] [stderr]    Compiling winapi v0.3.9
[INFO] [stderr]    Compiling futures-locks v0.7.1
[INFO] [stderr]    Compiling utfx v0.1.0
[INFO] [stderr]    Compiling cfb-mode v0.8.2
[INFO] [stderr]    Compiling webpki-roots v0.26.11
[INFO] [stderr]    Compiling flate2 v1.1.5
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.105
[INFO] [stderr]    Compiling prettyplease v0.2.37
[INFO] [stderr]    Compiling sct v0.7.1
[INFO] [stderr]    Compiling rustls-webpki v0.101.7
[INFO] [stderr]    Compiling rustls-webpki v0.103.8
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling impl-trait-for-tuples v0.2.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling parity-scale-codec-derive v3.7.5
[INFO] [stderr]    Compiling derive_more-impl v1.0.0
[INFO] [stderr]    Compiling zerofrom-derive v0.1.6
[INFO] [stderr]    Compiling scale-info-derive v2.11.6
[INFO] [stderr]    Compiling yoke-derive v0.8.1
[INFO] [stderr]    Compiling zerovec-derive v0.11.2
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling auto_impl v1.3.0
[INFO] [stderr]    Compiling strum_macros v0.26.4
[INFO] [stderr]    Compiling derive_more v1.0.0
[INFO] [stderr]    Compiling num_enum_derive v0.7.5
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling thiserror-impl v2.0.17
[INFO] [stderr]    Compiling pin-project-internal v1.1.10
[INFO] [stderr]    Compiling async-trait v0.1.89
[INFO] [stderr]    Compiling windows-implement v0.58.0
[INFO] [stderr]    Compiling zerofrom v0.1.6
[INFO] [stderr]    Compiling windows-interface v0.58.0
[INFO] [stderr]    Compiling yoke v0.8.1
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling openssl-macros v0.1.1
[INFO] [stderr]    Compiling zerovec v0.11.5
[INFO] [stderr]    Compiling zerotrie v0.2.3
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.105
[INFO] [stderr]    Compiling num_enum v0.7.5
[INFO] [stderr]    Compiling openssl v0.10.75
[INFO] [stderr]    Compiling windows-core v0.58.0
[INFO] [stderr]    Compiling simple_asn1 v0.6.3
[INFO] [stderr]    Compiling tinystr v0.8.2
[INFO] [stderr]    Compiling potential_utf v0.1.4
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling pin-project v1.1.10
[INFO] [stderr]    Compiling icu_locale_core v2.1.1
[INFO] [stderr]    Compiling icu_collections v2.1.1
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling windows v0.58.0
[INFO] [stderr]    Compiling registry v1.3.0
[INFO] [stderr]    Compiling strum v0.26.3
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling icu_provider v2.1.1
[INFO] [stderr]    Compiling bytes v1.10.1
[INFO] [stderr]    Compiling impl-serde v0.4.0
[INFO] [stderr]    Compiling cargo-platform v0.1.9
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling serde_spanned v0.6.9
[INFO] [stderr]    Compiling js-sys v0.3.82
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling icu_normalizer v2.1.1
[INFO] [stderr]    Compiling icu_properties v2.1.1
[INFO] [stderr]    Compiling coins-core v0.8.7
[INFO] [stderr]    Compiling cargo_metadata v0.18.1
[INFO] [stderr]    Compiling toml_edit v0.22.27
[INFO] [stderr]    Compiling jsonwebtoken v8.3.0
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling coins-bip32 v0.8.7
[INFO] [stderr]    Compiling scale-info v2.11.6
[INFO] [stderr]    Compiling rlp v0.5.2
[INFO] [stderr]    Compiling impl-codec v0.6.0
[INFO] [stderr]    Compiling open-fastrlp-derive v0.1.1
[INFO] [stderr]    Compiling http v0.2.12
[INFO] [stderr]    Compiling tokio v1.48.0
[INFO] [stderr]    Compiling impl-rlp v0.3.0
[INFO] [stderr]    Compiling idna_adapter v1.2.1
[INFO] [stderr]    Compiling enr v0.10.0
[INFO] [stderr]    Compiling coins-bip39 v0.8.7
[INFO] [stderr]    Compiling idna v1.1.0
[INFO] [stderr]    Compiling eth-keystore v0.5.0
[INFO] [stderr]    Compiling primitive-types v0.12.2
[INFO] [stderr]    Compiling ethbloom v0.13.0
[INFO] [stderr] error: could not compile `rustls` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38/bin/rustc --crate-name rustls --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rustls-0.21.12/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="dangerous_configuration"' --cfg 'feature="default"' --cfg 'feature="log"' --cfg 'feature="logging"' --cfg 'feature="tls12"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("dangerous_configuration", "default", "log", "logging", "quic", "read_buf", "rustversion", "secret_extraction", "tls12"))' -C metadata=5f33792d71a6faac -C extra-filename=-d4c9454b31e4a3ce --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern log=/opt/rustwide/target/debug/deps/liblog-45f74354a8b36c20.rmeta --extern ring=/opt/rustwide/target/debug/deps/libring-9d524d1f69ded92f.rmeta --extern webpki=/opt/rustwide/target/debug/deps/libwebpki-4c8856dea4b4cdf5.rmeta --extern sct=/opt/rustwide/target/debug/deps/libsct-6f688f61dc27086f.rmeta --cap-lints allow --cap-lints=forbid -L native=/opt/rustwide/target/debug/build/ring-58129ef964996e7d/out` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rustls` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38/bin/rustc --crate-name rustls --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rustls-0.23.35/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --warn=unexpected_cfgs --check-cfg 'cfg(bench)' --check-cfg 'cfg(coverage_nightly)' --check-cfg 'cfg(read_buf)' --check-cfg 'cfg(rustls_docsrs)' --cfg 'feature="log"' --cfg 'feature="logging"' --cfg 'feature="ring"' --cfg 'feature="std"' --cfg 'feature="tls12"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("aws-lc-rs", "aws_lc_rs", "brotli", "custom-provider", "default", "fips", "hashbrown", "log", "logging", "prefer-post-quantum", "read_buf", "ring", "rustversion", "std", "tls12", "zlib"))' -C metadata=81465d18e8f9bf45 -C extra-filename=-55931aa9cf1470f2 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern log=/opt/rustwide/target/debug/deps/liblog-45f74354a8b36c20.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-0ba6aecba7086d38.rmeta --extern ring=/opt/rustwide/target/debug/deps/libring-9d524d1f69ded92f.rmeta --extern pki_types=/opt/rustwide/target/debug/deps/librustls_pki_types-338cd8e168de9c12.rmeta --extern webpki=/opt/rustwide/target/debug/deps/libwebpki-5385eaf0c8cdc9f2.rmeta --extern subtle=/opt/rustwide/target/debug/deps/libsubtle-fdb157e48338ed49.rmeta --extern zeroize=/opt/rustwide/target/debug/deps/libzeroize-36c98e1e0ab441af.rmeta --cap-lints allow --cap-lints=forbid -L native=/opt/rustwide/target/debug/build/ring-58129ef964996e7d/out` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "54f87fcb75eb5d4dc979998b0f1d9d0081236402d6e5af5dc20f19332b5bc5f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54f87fcb75eb5d4dc979998b0f1d9d0081236402d6e5af5dc20f19332b5bc5f6", kill_on_drop: false }`
[INFO] [stdout] 54f87fcb75eb5d4dc979998b0f1d9d0081236402d6e5af5dc20f19332b5bc5f6