[INFO] crate edgebadge 0.4.0 is already in cache [INFO] testing edgebadge-0.4.0 against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409 [INFO] extracting crate edgebadge 0.4.0 into /workspace/builds/worker-8/source [INFO] validating manifest of crates.io crate edgebadge 0.4.0 on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking crates.io crate edgebadge 0.4.0 [INFO] removed 0 missing examples [INFO] finished tweaking crates.io crate edgebadge 0.4.0 [INFO] tweaked toml for crates.io crate edgebadge 0.4.0 written to /workspace/builds/worker-8/source/Cargo.toml [INFO] crate crates.io crate edgebadge 0.4.0 already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] b724ad2979d7cd5e67e11f23483884f5a1bb4e0808081a8abe46eb926ade6df5 [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" "b724ad2979d7cd5e67e11f23483884f5a1bb4e0808081a8abe46eb926ade6df5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "b724ad2979d7cd5e67e11f23483884f5a1bb4e0808081a8abe46eb926ade6df5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b724ad2979d7cd5e67e11f23483884f5a1bb4e0808081a8abe46eb926ade6df5", kill_on_drop: false }` [INFO] [stdout] b724ad2979d7cd5e67e11f23483884f5a1bb4e0808081a8abe46eb926ade6df5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 7dd7e8fbee7b453e2eb018bd77de39cb5db2258d6344db83963a5c96fd6e102c [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" "7dd7e8fbee7b453e2eb018bd77de39cb5db2258d6344db83963a5c96fd6e102c", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.7 [INFO] [stderr] Compiling unicode-xid v0.2.0 [INFO] [stderr] Compiling syn v1.0.13 [INFO] [stderr] Compiling typenum v1.11.2 [INFO] [stderr] Compiling semver-parser v0.7.0 [INFO] [stderr] Compiling version_check v0.1.5 [INFO] [stderr] Compiling memchr v2.2.1 [INFO] [stderr] Compiling cortex-m v0.6.1 [INFO] [stderr] Compiling proc-macro2 v0.4.30 [INFO] [stderr] Compiling stable_deref_trait v1.1.1 [INFO] [stderr] Compiling unicode-xid v0.1.0 [INFO] [stderr] Compiling syn v0.15.44 [INFO] [stderr] Compiling autocfg v1.0.0 [INFO] [stderr] Compiling vcell v0.1.2 [INFO] [stderr] Compiling cortex-m-rt v0.6.11 [INFO] [stderr] Compiling nb v0.1.2 [INFO] [stderr] Compiling atsamd51j19a v0.6.0 [INFO] [stderr] Compiling r0 v0.2.2 [INFO] [stderr] Compiling num-derive v0.2.5 [INFO] [stderr] Compiling void v1.0.2 [INFO] [stderr] Compiling st7735-lcd v0.5.0 [INFO] [stderr] Compiling rand_core v0.5.1 [INFO] [stderr] Compiling bitfield v0.13.2 [INFO] [stderr] Compiling edgebadge v0.4.0 (/opt/rustwide/workdir) [INFO] [stderr] Compiling volatile-register v0.2.0 [INFO] [stderr] Compiling semver v0.9.0 [INFO] [stderr] Compiling embedded-hal v0.2.3 [INFO] [stderr] Compiling nom v4.2.3 [INFO] [stderr] Compiling rustc_version v0.2.3 [INFO] [stderr] Compiling num-traits v0.2.11 [INFO] [stderr] Compiling bare-metal v0.2.5 [INFO] [stderr] Compiling quote v0.6.13 [INFO] [stderr] Compiling quote v1.0.2 [INFO] [stderr] Compiling generic-array v0.12.3 [INFO] [stderr] Compiling generic-array v0.13.2 [INFO] [stderr] Compiling tinytga v0.1.0 [INFO] [stderr] Compiling tinybmp v0.1.0 [INFO] [stderr] Compiling as-slice v0.1.2 [INFO] [stderr] Compiling embedded-graphics v0.4.9 [INFO] [stderr] Compiling aligned v0.3.2 [INFO] [stderr] Compiling cortex-m-rt-macros v0.1.7 [INFO] [stderr] Compiling proc-macro-hack v0.5.11 [INFO] [stderr] Compiling paste-impl v0.1.6 [INFO] [stderr] Compiling paste v0.1.6 [INFO] [stderr] Compiling atsamd-hal v0.8.0 [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1m 22s [INFO] running `Command { std: "docker" "inspect" "7dd7e8fbee7b453e2eb018bd77de39cb5db2258d6344db83963a5c96fd6e102c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "7dd7e8fbee7b453e2eb018bd77de39cb5db2258d6344db83963a5c96fd6e102c", kill_on_drop: false }` [INFO] [stdout] 7dd7e8fbee7b453e2eb018bd77de39cb5db2258d6344db83963a5c96fd6e102c [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] fbce8a88aa2d5861c4834ccd39a5fbcf285190615103ced3298a7e7d52b66b4e [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" "fbce8a88aa2d5861c4834ccd39a5fbcf285190615103ced3298a7e7d52b66b4e", kill_on_drop: false }` [INFO] [stderr] Compiling stable_deref_trait v1.1.1 [INFO] [stderr] Compiling vcell v0.1.2 [INFO] [stderr] Compiling nb v0.1.2 [INFO] [stderr] Compiling void v1.0.2 [INFO] [stderr] Compiling rand_core v0.4.2 [INFO] [stderr] Compiling byteorder v1.3.2 [INFO] [stderr] Compiling r0 v0.2.2 [INFO] [stderr] Compiling cortex-m v0.5.10 [INFO] [stderr] Compiling rgb v0.8.16 [INFO] [stderr] Compiling heapless v0.4.4 [INFO] [stderr] Compiling bitfield v0.13.2 [INFO] [stderr] Compiling cortex-m-rtfm v0.4.3 [INFO] [stderr] Compiling aligned v0.2.0 [INFO] [stderr] Compiling rand_core v0.5.1 [INFO] [stderr] Compiling lis3dh v0.1.0 [INFO] [stderr] Compiling panic-halt v0.2.0 [INFO] [stderr] Compiling typenum v1.11.2 [INFO] [stderr] Compiling volatile-register v0.2.0 [INFO] [stderr] Compiling memchr v2.2.1 [INFO] [stderr] Compiling num-traits v0.2.11 [INFO] [stderr] Compiling bare-metal v0.2.5 [INFO] [stderr] Compiling cortex-m-rt v0.6.11 [INFO] [stderr] Compiling embedded-hal v0.2.3 [INFO] [stderr] Compiling paste v0.1.6 [INFO] [stderr] Compiling nom v4.2.3 [INFO] [stderr] Compiling rand_core v0.3.1 [INFO] [stderr] Compiling rand v0.5.6 [INFO] [stderr] Compiling smart-leds-trait v0.2.0 [INFO] [stderr] Compiling smart-leds v0.3.0 [INFO] [stderr] Compiling ws2812-spi v0.2.0 [INFO] [stderr] Compiling hash32 v0.1.1 [INFO] [stderr] Compiling tinybmp v0.1.0 [INFO] [stderr] Compiling tinytga v0.1.0 [INFO] [stderr] Compiling generic-array v0.13.2 [INFO] [stderr] Compiling generic-array v0.12.3 [INFO] [stderr] Compiling generic-array v0.11.1 [INFO] [stderr] Compiling micromath v0.3.1 [INFO] [stderr] Compiling embedded-graphics v0.4.9 [INFO] [stderr] Compiling as-slice v0.1.2 [INFO] [stderr] Compiling st7735-lcd v0.5.0 [INFO] [stderr] Compiling accelerometer v0.6.1 [INFO] [stderr] Compiling owned-singleton-macros v0.1.0 [INFO] [stderr] Compiling cortex-m-rtfm-macros v0.4.3 [INFO] [stderr] Compiling aligned v0.3.2 [INFO] [stderr] Compiling cortex-m v0.6.1 [INFO] [stderr] Compiling atsamd51j19a v0.6.0 [INFO] [stderr] Compiling owned-singleton v0.1.0 [INFO] [stderr] Compiling atsamd-hal v0.8.0 [INFO] [stderr] Compiling edgebadge v0.4.0 (/opt/rustwide/workdir) [INFO] [stdout] error: language item required, but not found: `eh_personality` [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `edgebadge`. [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] [INFO] [stdout] error: language item required, but not found: `eh_personality` [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:850:25 [INFO] [stdout] | [INFO] [stdout] 850 | assert_eq!(Some(Keys::BDown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:851:25 [INFO] [stdout] | [INFO] [stdout] 851 | assert_eq!(Some(Keys::ADown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:852:25 [INFO] [stdout] | [INFO] [stdout] 852 | assert_eq!(Some(Keys::StartDown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:853:25 [INFO] [stdout] | [INFO] [stdout] 853 | assert_eq!(Some(Keys::SelectDown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:865:25 [INFO] [stdout] | [INFO] [stdout] 865 | assert_eq!(Some(Keys::BUp), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:866:25 [INFO] [stdout] | [INFO] [stdout] 866 | assert_eq!(Some(Keys::AUp), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:867:25 [INFO] [stdout] | [INFO] [stdout] 867 | assert_eq!(Some(Keys::StartUp), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:868:25 [INFO] [stdout] | [INFO] [stdout] 868 | assert_eq!(Some(Keys::SelectUp), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:880:25 [INFO] [stdout] | [INFO] [stdout] 880 | assert_eq!(Some(Keys::BUp), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:881:25 [INFO] [stdout] | [INFO] [stdout] 881 | assert_eq!(Some(Keys::ADown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:882:25 [INFO] [stdout] | [INFO] [stdout] 882 | assert_eq!(Some(Keys::StartUp), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:883:25 [INFO] [stdout] | [INFO] [stdout] 883 | assert_eq!(Some(Keys::SelectDown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:895:25 [INFO] [stdout] | [INFO] [stdout] 895 | assert_eq!(Some(Keys::ADown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Keys` [INFO] [stdout] --> src/pins.rs:896:25 [INFO] [stdout] | [INFO] [stdout] 896 | assert_eq!(Some(Keys::SelectDown), iter.next()); [INFO] [stdout] | ^^^^ use of undeclared type or module `Keys` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:844:24 [INFO] [stdout] | [INFO] [stdout] 844 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:859:24 [INFO] [stdout] | [INFO] [stdout] 859 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:874:24 [INFO] [stdout] | [INFO] [stdout] 874 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:889:24 [INFO] [stdout] | [INFO] [stdout] 889 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:902:24 [INFO] [stdout] | [INFO] [stdout] 902 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:913:24 [INFO] [stdout] | [INFO] [stdout] 913 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0422]: cannot find struct, variant or union type `ButtonIter` in this scope [INFO] [stdout] --> src/pins.rs:924:24 [INFO] [stdout] | [INFO] [stdout] 924 | let mut iter = ButtonIter { [INFO] [stdout] | ^^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `super::*` [INFO] [stdout] --> src/pins.rs:840:9 [INFO] [stdout] | [INFO] [stdout] 840 | use super::*; [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: duplicate lang item in crate `panic_halt`: `panic_impl`. [INFO] [stdout] | [INFO] [stdout] = note: the lang item is first defined in crate `std` (which `test` depends on) [INFO] [stdout] = note: first definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-5989bcf78182f65e.so, /opt/rustwide/rustup-home/toolchains/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-5989bcf78182f65e.rlib [INFO] [stdout] = note: second definition in `panic_halt` loaded from /opt/rustwide/target/debug/deps/libpanic_halt-159e7dc97a51b32e.rlib [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 22 previous errors; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0422, E0433. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0422`. [INFO] [stdout] [INFO] [stderr] error: build failed [INFO] running `Command { std: "docker" "inspect" "fbce8a88aa2d5861c4834ccd39a5fbcf285190615103ced3298a7e7d52b66b4e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "fbce8a88aa2d5861c4834ccd39a5fbcf285190615103ced3298a7e7d52b66b4e", kill_on_drop: false }` [INFO] [stdout] fbce8a88aa2d5861c4834ccd39a5fbcf285190615103ced3298a7e7d52b66b4e