[INFO] cloning repository https://github.com/sasankbarnala/studentreportcard [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sasankbarnala/studentreportcard" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsasankbarnala%2Fstudentreportcard", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsasankbarnala%2Fstudentreportcard'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] dd1c0b1c638ed02bad7e17f66e347733e0eb4a97 [INFO] testing sasankbarnala/studentreportcard against master#b03b3a7ec92682be2917540b679478d41c95a30c for pr-137122-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsasankbarnala%2Fstudentreportcard" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/sasankbarnala/studentreportcard [INFO] finished tweaking git repo https://github.com/sasankbarnala/studentreportcard [INFO] tweaked toml for git repo https://github.com/sasankbarnala/studentreportcard written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/sasankbarnala/studentreportcard on toolchain b03b3a7ec92682be2917540b679478d41c95a30c [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b03b3a7ec92682be2917540b679478d41c95a30c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/sasankbarnala/studentreportcard 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" "+b03b3a7ec92682be2917540b679478d41c95a30c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded ic-cdk-executor v1.0.0 [INFO] [stderr] Downloaded ic-error-types v0.2.0 [INFO] [stderr] Downloaded ic-management-canister-types v0.3.1 [INFO] [stderr] Downloaded ic0 v0.25.1 [INFO] [stderr] Downloaded ic-cdk-macros v0.18.4 [INFO] [stderr] Downloaded ic-cdk v0.18.4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+b03b3a7ec92682be2917540b679478d41c95a30c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5735dc8f3abc4b16516f66ffdbfe1a8503de613b7f773094b4bd240baf74df21 [INFO] running `Command { std: "docker" "start" "-a" "5735dc8f3abc4b16516f66ffdbfe1a8503de613b7f773094b4bd240baf74df21", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5735dc8f3abc4b16516f66ffdbfe1a8503de613b7f773094b4bd240baf74df21", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5735dc8f3abc4b16516f66ffdbfe1a8503de613b7f773094b4bd240baf74df21", kill_on_drop: false }` [INFO] [stdout] 5735dc8f3abc4b16516f66ffdbfe1a8503de613b7f773094b4bd240baf74df21 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+b03b3a7ec92682be2917540b679478d41c95a30c" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 5c6b6b829aa90fe8da633dd5561f426553be57fce0f87370fdf031919e79b1cf [INFO] running `Command { std: "docker" "start" "-a" "5c6b6b829aa90fe8da633dd5561f426553be57fce0f87370fdf031919e79b1cf", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.95 [INFO] [stderr] Compiling unicode-ident v1.0.18 [INFO] [stderr] Compiling version_check v0.9.5 [INFO] [stderr] Compiling typenum v1.18.0 [INFO] [stderr] Compiling shlex v1.3.0 [INFO] [stderr] Compiling rustversion v1.0.21 [INFO] [stderr] Compiling serde v1.0.219 [INFO] [stderr] Compiling autocfg v1.5.0 [INFO] [stderr] Compiling cfg-if v1.0.1 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling cc v1.2.27 [INFO] [stderr] Compiling thiserror v1.0.69 [INFO] [stderr] Compiling generic-array v0.14.7 [INFO] [stderr] Compiling libc v0.2.174 [INFO] [stderr] Compiling num-traits v0.2.19 [INFO] [stderr] Compiling lazy_static v1.5.0 [INFO] [stderr] Compiling cpufeatures v0.2.17 [INFO] [stderr] Compiling quote v1.0.40 [INFO] [stderr] Compiling either v1.15.0 [INFO] [stderr] Compiling paste v1.0.15 [INFO] [stderr] Compiling anyhow v1.0.98 [INFO] [stderr] Compiling syn v2.0.104 [INFO] [stderr] Compiling crc32fast v1.4.2 [INFO] [stderr] Compiling unicode-width v0.1.14 [INFO] [stderr] Compiling strsim v0.11.1 [INFO] [stderr] Compiling psm v0.1.26 [INFO] [stderr] Compiling stacker v0.1.21 [INFO] [stderr] Compiling fnv v1.0.7 [INFO] [stderr] Compiling block-buffer v0.10.4 [INFO] [stderr] Compiling crypto-common v0.1.6 [INFO] [stderr] Compiling num-integer v0.1.46 [INFO] [stderr] Compiling ident_case v1.0.1 [INFO] [stderr] Compiling typed-arena v2.0.2 [INFO] [stderr] Compiling digest v0.10.7 [INFO] [stderr] Compiling data-encoding v2.9.0 [INFO] [stderr] Compiling arrayvec v0.5.2 [INFO] [stderr] Compiling sha2 v0.10.9 [INFO] [stderr] Compiling slotmap v1.0.7 [INFO] [stderr] Compiling pretty v0.12.4 [INFO] [stderr] Compiling leb128 v0.2.5 [INFO] [stderr] Compiling heck v0.5.0 [INFO] [stderr] Compiling byteorder v1.5.0 [INFO] [stderr] Compiling hex v0.4.3 [INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmetal6UUcy" [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `byteorder` (lib) due to 1 previous error [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] rustc-LLVM ERROR: IO failure on output stream: No space left on device [INFO] [stderr] error: could not compile `heck` (lib) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] No space left on device (os error 28) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse process output: `/opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/bin/rustc --crate-name heck --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/heck-0.5.0/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 --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=faa1acbe2bb4e337 -C extra-filename=-8e1f98ffb0a497ae --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow --cap-lints=forbid` (exit status: 101) [INFO] [stderr] rustc-LLVM ERROR: IO failure on output stream: No space left on device [INFO] [stderr] error: could not compile `data-encoding` (lib) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] No space left on device (os error 28) [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse process output: `/opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/bin/rustc --crate-name data_encoding --edition=2018 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/data-encoding-2.9.0/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=unused-results --warn=unsafe-op-in-unsafe-fn --warn=unreachable-pub '--warn=clippy::undocumented-unsafe-blocks' --warn=missing-docs --warn=missing-debug-implementations --warn=let-underscore-drop --warn=elided-lifetimes-in-paths --cfg 'feature="alloc"' --cfg 'feature="default"' --cfg 'feature="std"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("alloc", "default", "std"))' -C metadata=182e505c276a866a -C extra-filename=-6d465a39edfa29f6 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow --cap-lints=forbid` (exit status: 101) [INFO] [stdout] error: linking with `cc` failed: exit status: 1 [INFO] [stdout] | [INFO] [stdout] = note: "cc" "-Wl,--version-script=/tmp/rustcxjw9sc/list" "-Wl,--no-undefined-version" "-m64" "/tmp/rustcxjw9sc/symbols.o" "<8 object files omitted>" "/tmp/rustcxjw9sc/rmeta.o" "<1 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libproc_macro-*,librustc_literal_escaper-*,librustc_std_workspace_std-*,libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,libcfg_if-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustcxjw9sc/raw-dylibs" "-B/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,-znostart-stop-gc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/libpaste-de6dfd786916684a.so" "-Wl,--gc-sections" "-shared" "-Wl,-z,relro,-z,now" "-nodefaultlibs" [INFO] [stdout] = note: some arguments are omitted. use `--verbose` to show all linker arguments [INFO] [stdout] = note: PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace. [INFO] [stdout] Stack dump: [INFO] [stdout] 0. Program arguments: /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/bin/rust-lld -flavor gnu -plugin /usr/libexec/gcc/x86_64-linux-gnu/13/liblto_plugin.so -plugin-opt=/usr/libexec/gcc/x86_64-linux-gnu/13/lto-wrapper -plugin-opt=-fresolution=/tmp/ccwzIzKN.res --build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed -shared -z relro -o /opt/rustwide/target/debug/deps/libpaste-de6dfd786916684a.so /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/13/crtbeginS.o -L/tmp/rustcxjw9sc/raw-dylibs -L/opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib -L/opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld -L/usr/lib/gcc/x86_64-linux-gnu/13 -L/usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/13/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/13/../../.. --version-script=/tmp/rustcxjw9sc/list --no-undefined-version /tmp/rustcxjw9sc/symbols.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.0.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.1.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.2.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.3.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.4.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.5.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.6.rcgu.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.paste.2e25a9d5fe06ac6b-cgu.7.rcgu.o /tmp/rustcxjw9sc/rmeta.o /opt/rustwide/target/debug/deps/paste-de6dfd786916684a.3g41slxnfzulhe5nv4cmw58l9.rcgu.o --as-needed -Bstatic /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libproc_macro-176c319d4870d9ab.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_literal_escaper-bcf8ad99cd3ec5b5.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-99a106327f715828.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-c3f1bd7325067ba3.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-eb0983423cf82003.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-cd4c0188f9d1e734.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-a2bf11d3a12d126e.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-fb62395cf0e2d213.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-97c81a39568124f8.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-491e50fe45cb1ae3.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-03858a0c8634e281.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-9850d1090a264569.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-c01e0363be5a44fe.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-8629fb2e3b9363f0.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler2-f6afd37a755fb05d.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-fcea91ed39cd71ec.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-9776cdb99ff39b02.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-ac5014cc0fda32cf.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-580abfecd4c0838f.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-fa26ced683f77497.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-3d3ce652f9fb12f3.rlib /opt/rustwide/rustup-home/toolchains/b03b3a7ec92682be2917540b679478d41c95a30c/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-c9466c42e9d1044b.rlib -Bdynamic -lgcc_s -lutil -lrt -lpthread -lm -ldl -lc -znostart-stop-gc --eh-frame-hdr -z noexecstack --gc-sections -z relro -z now /usr/lib/gcc/x86_64-linux-gnu/13/crtendS.o /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/crtn.o [INFO] [stdout] LLVM ERROR: IO failure on output stream: No space left on device [INFO] [stdout] collect2: error: ld returned 1 exit status [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `paste` (lib) due to 1 previous error [INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmetaG4tbtD" [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `syn` (lib) due to 1 previous error [INFO] [stdout] error: failed to write to `/opt/rustwide/target/debug/deps/rmetad3A0QE/full.rmeta`: No space left on device (os error 28) [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `syn` (lib) due to 1 previous error [INFO] running `Command { std: "docker" "inspect" "5c6b6b829aa90fe8da633dd5561f426553be57fce0f87370fdf031919e79b1cf", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5c6b6b829aa90fe8da633dd5561f426553be57fce0f87370fdf031919e79b1cf", kill_on_drop: false }` [INFO] [stdout] 5c6b6b829aa90fe8da633dd5561f426553be57fce0f87370fdf031919e79b1cf