[INFO] fetching crate fedimint-gateway-server-db 0.7.2... [INFO] testing fedimint-gateway-server-db-0.7.2 against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0 [INFO] extracting crate fedimint-gateway-server-db 0.7.2 into /workspace/builds/worker-4-tc1/source [INFO] started tweaking crates.io crate fedimint-gateway-server-db 0.7.2 [INFO] finished tweaking crates.io crate fedimint-gateway-server-db 0.7.2 [INFO] tweaked toml for crates.io crate fedimint-gateway-server-db 0.7.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate fedimint-gateway-server-db 0.7.2 on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate crates.io crate fedimint-gateway-server-db 0.7.2 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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded fedimint-lnv2-common v0.7.2 [INFO] [stderr] Downloaded value-bag v1.10.0 [INFO] [stderr] Downloaded quinn-udp v0.5.2 [INFO] [stderr] Downloaded fedimint-tpe v0.7.2 [INFO] [stderr] Downloaded rustls-pemfile v2.1.1 [INFO] [stderr] Downloaded jsonrpsee-wasm-client v0.24.9 [INFO] [stderr] Downloaded fedimint-mint-common v0.7.2 [INFO] [stderr] Downloaded bounded-integer v0.5.7 [INFO] [stderr] Downloaded hmac-sha256 v1.1.8 [INFO] [stderr] Downloaded z32 v1.3.0 [INFO] [stderr] Downloaded portmapper v0.4.0 [INFO] [stderr] Downloaded fedimint-tbs v0.7.2 [INFO] [stderr] Downloaded jaq-core v2.1.1 [INFO] [stderr] Downloaded esplora-client v0.10.0 [INFO] [stderr] Downloaded clap v4.5.34 [INFO] [stderr] Downloaded hifijson v0.2.2 [INFO] [stderr] Downloaded fedimint-mint-client v0.7.2 [INFO] [stderr] Downloaded async-std v1.13.0 [INFO] [stderr] Downloaded fedimint-wallet-client v0.7.2 [INFO] [stderr] Downloaded webpki-root-certs v0.26.8 [INFO] [stderr] Downloaded iroh-relay v0.34.0 [INFO] [stderr] Downloaded ureq v2.10.1 [INFO] [stderr] Downloaded iroh-net-report v0.34.0 [INFO] [stderr] Downloaded clap_builder v4.5.34 [INFO] [stderr] Downloaded iroh-quinn v0.13.0 [INFO] [stderr] Downloaded iroh-quinn-proto v0.13.0 [INFO] [stderr] Downloaded fedimint-client-module v0.7.2 [INFO] [stderr] Downloaded fedimint-wallet-common v0.7.2 [INFO] [stderr] Downloaded cordyceps v0.3.2 [INFO] [stderr] Downloaded netwatch v0.4.0 [INFO] [stderr] Downloaded mainline v2.0.1 [INFO] [stderr] Downloaded wmi v0.14.3 [INFO] [stderr] Downloaded precis-core v0.1.10 [INFO] [stderr] Downloaded fedimint-bitcoind v0.7.2 [INFO] [stderr] Downloaded diatomic-waker v0.2.3 [INFO] [stderr] Downloaded n0-future v0.1.2 [INFO] [stderr] Downloaded simple-dns v0.6.2 [INFO] [stderr] Downloaded pkarr v2.2.1 [INFO] [stderr] Downloaded iroh-metrics v0.32.0 [INFO] [stderr] Downloaded netdev v0.31.0 [INFO] [stderr] Downloaded netwatch v0.3.0 [INFO] [stderr] Downloaded impl-tools v0.10.3 [INFO] [stderr] Downloaded futures-buffered v0.2.11 [INFO] [stderr] Downloaded erased_set v0.8.0 [INFO] [stderr] Downloaded struct_iterable_derive v0.1.0 [INFO] [stderr] Downloaded struct_iterable_internal v0.1.1 [INFO] [stderr] Downloaded struct_iterable v0.1.1 [INFO] [stderr] Downloaded iroh-quinn-udp v0.5.7 [INFO] [stderr] Downloaded precis-profiles v0.1.11 [INFO] [stderr] Downloaded jaq-json v1.1.1 [INFO] [stderr] Downloaded impl-tools-lib v0.11.1 [INFO] [stderr] Downloaded fedimint-gateway-common v0.7.2 [INFO] [stderr] Downloaded lnurl-rs v0.9.0 [INFO] [stderr] Downloaded pnet_macros v0.34.0 [INFO] [stderr] Downloaded pnet_base v0.34.0 [INFO] [stderr] Downloaded surge-ping v0.8.1 [INFO] [stderr] Downloaded rustls-platform-verifier v0.5.0 [INFO] [stderr] Downloaded serde_bencode v0.2.4 [INFO] [stderr] Downloaded stun-rs v0.1.9 [INFO] [stderr] Downloaded jsonrpsee-client-transport v0.24.9 [INFO] [stderr] Downloaded fedimint-api-client v0.7.2 [INFO] [stderr] Downloaded fedimint-build v0.7.2 [INFO] [stderr] Downloaded fedimint-ln-client v0.7.2 [INFO] [stderr] Downloaded imbl v5.0.0 [INFO] [stderr] Downloaded miniscript v12.3.1 [INFO] [stderr] Downloaded jaq-std v2.1.0 [INFO] [stderr] Downloaded crypto_box v0.9.1 [INFO] [stderr] Downloaded pnet_macros_support v0.34.0 [INFO] [stderr] Downloaded pnet_packet v0.34.0 [INFO] [stderr] Downloaded tokio-tungstenite-wasm v0.4.0 [INFO] [stderr] Downloaded pem v3.0.3 [INFO] [stderr] Downloaded ucd-parse v0.1.13 [INFO] [stderr] Downloaded quoted-string-parser v0.1.0 [INFO] [stderr] Downloaded iroh v0.34.0 [INFO] [stderr] Downloaded bls12_381 v0.8.0 [INFO] [stderr] Downloaded fedimint-threshold-crypto v0.2.1 [INFO] [stderr] Downloaded fedimint-hkdf v0.7.2 [INFO] [stderr] Downloaded fedimint-ln-common v0.7.2 [INFO] [stderr] Downloaded event-listener v5.2.0 [INFO] [stderr] Downloaded bitmaps v3.2.1 [INFO] [stderr] Downloaded imbl-sized-chunks v0.1.3 [INFO] [stderr] Downloaded macro_rules_attribute-proc_macro v0.2.0 [INFO] [stderr] Downloaded macro_rules_attribute v0.2.0 [INFO] [stderr] Downloaded rustls v0.21.11 [INFO] [stderr] Downloaded h2 v0.4.4 [INFO] [stderr] Downloaded hmac-sha1 v0.2.2 [INFO] [stderr] Downloaded hostname-validator v1.1.1 [INFO] [stderr] Downloaded precis-tools v0.1.8 [INFO] [stderr] Downloaded fedimint-derive-secret v0.7.2 [INFO] [stderr] Downloaded base64-url v3.0.0 [INFO] [stderr] Downloaded fedimint-derive v0.7.2 [INFO] [stderr] Downloaded bitflags v2.7.0 [INFO] [stderr] Downloaded backon v1.4.1 [INFO] [stderr] Downloaded fedimint-logging v0.7.2 [INFO] [stderr] Downloaded iroh-base v0.34.0 [INFO] [stderr] Downloaded fedimint-core v0.7.2 [INFO] [stderr] Downloaded jsonrpsee-ws-client v0.24.9 [INFO] [stderr] Downloaded fedimint-eventlog v0.7.2 [INFO] [stderr] Downloaded email_address v0.2.5 [INFO] [stderr] Downloaded hex-conservative v0.3.0 [INFO] [stderr] Downloaded archery v1.2.1 [INFO] [stderr] Downloaded postcard-derive v0.1.2 [INFO] [stderr] Downloaded quinn v0.11.2 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 3b8d4bd9e081569e5002555cda6e49126f8b904d2236765cf3614c2ac11b598b [INFO] running `Command { std: "docker" "start" "-a" "3b8d4bd9e081569e5002555cda6e49126f8b904d2236765cf3614c2ac11b598b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3b8d4bd9e081569e5002555cda6e49126f8b904d2236765cf3614c2ac11b598b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3b8d4bd9e081569e5002555cda6e49126f8b904d2236765cf3614c2ac11b598b", kill_on_drop: false }` [INFO] [stdout] 3b8d4bd9e081569e5002555cda6e49126f8b904d2236765cf3614c2ac11b598b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }` [INFO] [stdout] 30f9c41d38a5741f2ac8ab49b2035fa39f4d8622841a462a0e3d46cdf406325f [INFO] running `Command { std: "docker" "start" "-a" "30f9c41d38a5741f2ac8ab49b2035fa39f4d8622841a462a0e3d46cdf406325f", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.169 [INFO] [stderr] Compiling value-bag v1.10.0 [INFO] [stderr] Compiling serde v1.0.219 [INFO] [stderr] Compiling memchr v2.7.1 [INFO] [stderr] Compiling futures-core v0.3.31 [INFO] [stderr] Compiling smallvec v1.13.1 [INFO] [stderr] Compiling zeroize v1.7.0 [INFO] [stderr] Compiling scopeguard v1.2.0 [INFO] [stderr] Compiling once_cell v1.20.2 [INFO] [stderr] Compiling proc-macro2 v1.0.94 [INFO] [stderr] Compiling lock_api v0.4.11 [INFO] [stderr] Compiling itoa v1.0.10 [INFO] [stderr] Compiling futures-io v0.3.31 [INFO] [stderr] Compiling parking_lot_core v0.9.9 [INFO] [stderr] Compiling subtle v2.6.1 [INFO] [stderr] Compiling generic-array v0.14.7 [INFO] [stderr] Compiling futures-channel v0.3.31 [INFO] [stderr] Compiling futures-task v0.3.31 [INFO] [stderr] Compiling ppv-lite86 v0.2.17 [INFO] [stderr] Compiling ring v0.17.14 [INFO] [stderr] Compiling tracing-core v0.1.33 [INFO] [stderr] Compiling litemap v0.7.3 [INFO] [stderr] Compiling writeable v0.5.5 [INFO] [stderr] Compiling untrusted v0.9.0 [INFO] [stderr] Compiling crossbeam-utils v0.8.19 [INFO] [stderr] Compiling log v0.4.21 [INFO] [stderr] Compiling icu_locid_transform_data v1.5.0 [INFO] [stderr] Compiling icu_properties_data v1.5.0 [INFO] [stderr] Compiling icu_normalizer_data v1.5.0 [INFO] [stderr] Compiling write16 v1.0.0 [INFO] [stderr] Compiling utf16_iter v1.0.5 [INFO] [stderr] Compiling http v1.3.1 [INFO] [stderr] Compiling ryu v1.0.17 [INFO] [stderr] Compiling serde_json v1.0.140 [INFO] [stderr] Compiling parking v2.2.0 [INFO] [stderr] Compiling fastrand v2.1.1 [INFO] [stderr] Compiling equivalent v1.0.1 [INFO] [stderr] Compiling anyhow v1.0.97 [INFO] [stderr] Compiling paste v1.0.14 [INFO] [stderr] Compiling httparse v1.10.0 [INFO] [stderr] Compiling semver v1.0.26 [INFO] [stderr] Compiling quote v1.0.40 [INFO] [stderr] Compiling hex-conservative v0.2.1 [INFO] [stderr] Compiling syn v2.0.100 [INFO] [stderr] Compiling bitcoin-io v0.1.2 [INFO] [stderr] Compiling bitcoin-internals v0.3.0 [INFO] [stderr] Compiling concurrent-queue v2.5.0 [INFO] [stderr] Compiling block-buffer v0.10.4 [INFO] [stderr] Compiling secp256k1-sys v0.10.1 [INFO] [stderr] Compiling unicode-xid v0.2.6 [INFO] [stderr] Compiling zerocopy v0.8.17 [INFO] [stderr] Compiling base64ct v1.6.0 [INFO] [stderr] Compiling getrandom v0.3.1 [INFO] [stderr] Compiling rustls-pki-types v1.11.0 [INFO] [stderr] Compiling const-oid v0.9.6 [INFO] [stderr] Compiling hashbrown v0.14.3 [INFO] [stderr] Compiling hex_lit v0.1.1 [INFO] [stderr] Compiling data-encoding v2.6.0 [INFO] [stderr] Compiling winnow v0.5.40 [INFO] [stderr] Compiling rustc_version v0.4.0 [INFO] [stderr] Compiling pem-rfc7468 v0.7.0 [INFO] [stderr] Compiling either v1.10.0 [INFO] [stderr] Compiling bitcoin v0.32.5 [INFO] [stderr] Compiling toml_datetime v0.6.5 [INFO] [stderr] Compiling rustversion v1.0.14 [INFO] [stderr] Compiling curve25519-dalek v4.1.3 [INFO] [stderr] Compiling bech32 v0.11.0 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling event-listener v5.2.0 [INFO] [stderr] Compiling signature v2.2.0 [INFO] [stderr] Compiling indexmap v2.2.5 [INFO] [stderr] Compiling rustc-hash v2.0.0 [INFO] [stderr] Compiling rustls v0.23.22 [INFO] [stderr] Compiling bitflags v2.7.0 [INFO] [stderr] Compiling aho-corasick v1.1.2 [INFO] [stderr] Compiling rustls v0.21.11 [INFO] [stderr] Compiling event-listener-strategy v0.5.2 [INFO] [stderr] Compiling getrandom v0.2.15 [INFO] [stderr] Compiling socket2 v0.5.6 [INFO] [stderr] Compiling rand_core v0.6.4 [INFO] [stderr] Compiling parking_lot v0.12.1 [INFO] [stderr] Compiling mio v1.0.1 [INFO] [stderr] Compiling signal-hook-registry v1.4.1 [INFO] [stderr] Compiling crypto-common v0.1.6 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling digest v0.10.7 [INFO] [stderr] Compiling regex-syntax v0.8.2 [INFO] [stderr] Compiling rand_core v0.9.0 [INFO] [stderr] Compiling sha2 v0.10.8 [INFO] [stderr] Compiling ipnet v2.10.1 [INFO] [stderr] Compiling rand v0.8.5 [INFO] [stderr] Compiling cobs v0.2.3 [INFO] [stderr] Compiling ff v0.13.1 [INFO] [stderr] Compiling async-channel v2.3.1 [INFO] [stderr] Compiling futures-lite v2.5.0 [INFO] [stderr] Compiling regex-syntax v0.6.29 [INFO] [stderr] Compiling crunchy v0.2.2 [INFO] [stderr] Compiling group v0.13.0 [INFO] [stderr] Compiling http-body v1.0.1 [INFO] [stderr] Compiling num-traits v0.2.18 [INFO] [stderr] Compiling futures-timer v3.0.3 [INFO] [stderr] Compiling time-core v0.1.4 [INFO] [stderr] Compiling tiny-keccak v2.0.2 [INFO] [stderr] Compiling overload v0.1.1 [INFO] [stderr] Compiling toml_edit v0.21.1 [INFO] [stderr] Compiling bech32 v0.9.1 [INFO] [stderr] Compiling base16ct v0.2.0 [INFO] [stderr] Compiling powerfmt v0.2.0 [INFO] [stderr] Compiling time-macros v0.2.22 [INFO] [stderr] Compiling deranged v0.4.0 [INFO] [stderr] Compiling nu-ansi-term v0.46.0 [INFO] [stderr] Compiling pairing v0.23.0 [INFO] [stderr] Compiling parity-scale-codec v3.7.4 [INFO] [stderr] Compiling sharded-slab v0.1.7 [INFO] [stderr] Compiling const_format_proc_macros v0.2.34 [INFO] [stderr] Compiling regex-automata v0.4.6 [INFO] [stderr] Compiling tracing-log v0.2.0 [INFO] [stderr] Compiling http v0.2.12 [INFO] [stderr] Compiling thread_local v1.1.8 [INFO] [stderr] Compiling slotmap v1.0.7 [INFO] [stderr] Compiling num-conv v0.1.0 [INFO] [stderr] Compiling regex-lite v0.1.6 [INFO] [stderr] Compiling bitmaps v3.2.1 [INFO] [stderr] Compiling tower-layer v0.3.3 [INFO] [stderr] Compiling regex-automata v0.1.10 [INFO] [stderr] error: could not compile `syn` (lib) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/8de4c7234dd9b97c9d76b58671343fdbbc9a433e/bin/rustc --crate-name syn --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.100/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="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="fold"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="visit"' --cfg 'feature="visit-mut"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "test", "visit", "visit-mut"))' -C metadata=2878f20b1a6930c7 -C extra-filename=-84f12206d540c415 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-ffd2937310321277.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-649d25c2abe1ccbb.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-d1ba2a905d5fe3a9.rmeta --cap-lints allow` (signal: 9, SIGKILL: kill) [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: could not compile `regex-syntax` (lib) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/8de4c7234dd9b97c9d76b58671343fdbbc9a433e/bin/rustc --crate-name regex_syntax --edition=2018 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/regex-syntax-0.6.29/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="default"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("default", "unicode", "unicode-age", "unicode-bool", "unicode-case", "unicode-gencat", "unicode-perl", "unicode-script", "unicode-segment"))' -C metadata=c589898e8aad8414 -C extra-filename=-daf98d1477afd15c --out-dir /opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps --target x86_64-unknown-linux-musl -L dependency=/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill) [INFO] running `Command { std: "docker" "inspect" "30f9c41d38a5741f2ac8ab49b2035fa39f4d8622841a462a0e3d46cdf406325f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "30f9c41d38a5741f2ac8ab49b2035fa39f4d8622841a462a0e3d46cdf406325f", kill_on_drop: false }` [INFO] [stdout] 30f9c41d38a5741f2ac8ab49b2035fa39f4d8622841a462a0e3d46cdf406325f