[INFO] cloning repository https://github.com/guide-inc-org/flutter-multi-window [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guide-inc-org/flutter-multi-window" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguide-inc-org%2Fflutter-multi-window", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguide-inc-org%2Fflutter-multi-window'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 35eb4af1a1949b5868ae7d05a953e116e17123c2 [INFO] testing guide-inc-org/flutter-multi-window against beta-2026-04-21 for beta-1.96-2 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguide-inc-org%2Fflutter-multi-window" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'... [INFO] [stderr] done. [INFO] removed /workspace/builds/worker-6-tc2/source/.cargo/config.toml [INFO] started tweaking git repo https://github.com/guide-inc-org/flutter-multi-window [INFO] finished tweaking git repo https://github.com/guide-inc-org/flutter-multi-window [INFO] tweaked toml for git repo https://github.com/guide-inc-org/flutter-multi-window written to /workspace/builds/worker-6-tc2/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/guide-inc-org/flutter-multi-window on toolchain beta-2026-04-21 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/guide-inc-org/flutter-multi-window 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5f687277894b92d6456b6aab82009f75d4c5687ecfad6bf675c47733936a5c34 [INFO] running `Command { std: "docker" "start" "-a" "5f687277894b92d6456b6aab82009f75d4c5687ecfad6bf675c47733936a5c34", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5f687277894b92d6456b6aab82009f75d4c5687ecfad6bf675c47733936a5c34", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5f687277894b92d6456b6aab82009f75d4c5687ecfad6bf675c47733936a5c34", kill_on_drop: false }` [INFO] [stdout] 5f687277894b92d6456b6aab82009f75d4c5687ecfad6bf675c47733936a5c34 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] dd6261307442e9e66223041dd6019d1b50a9fe4767d60492fbac455871ae01da [INFO] running `Command { std: "docker" "start" "-a" "dd6261307442e9e66223041dd6019d1b50a9fe4767d60492fbac455871ae01da", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.36 [INFO] [stderr] Compiling unicode-xid v0.2.2 [INFO] [stderr] Compiling syn v1.0.90 [INFO] [stderr] Compiling serde_derive v1.0.126 [INFO] [stderr] Compiling serde v1.0.126 [INFO] [stderr] Compiling anyhow v1.0.43 [INFO] [stderr] Compiling unicode-segmentation v1.7.1 [INFO] [stderr] Compiling smallvec v1.6.1 [INFO] [stderr] Compiling either v1.6.1 [INFO] [stderr] Compiling pkg-config v0.3.19 [INFO] [stderr] Compiling itertools v0.10.1 [INFO] [stderr] Compiling strum v0.21.0 [INFO] [stderr] Compiling version-compare v0.0.11 [INFO] [stderr] Compiling libc v0.2.94 [INFO] [stderr] Compiling cfg-expr v0.8.1 [INFO] [stderr] Compiling memchr v2.4.0 [INFO] [stderr] Compiling version_check v0.9.3 [INFO] [stderr] Compiling quote v1.0.9 [INFO] [stderr] Compiling heck v0.3.2 [INFO] [stderr] Compiling futures-core v0.3.21 [INFO] [stderr] Compiling proc-macro-error-attr v1.0.4 [INFO] [stderr] Compiling futures-task v0.3.21 [INFO] [stderr] Compiling futures-channel v0.3.21 [INFO] [stderr] Compiling proc-macro-error v1.0.4 [INFO] [stderr] Compiling futures-sink v0.3.21 [INFO] [stderr] Compiling futures-util v0.3.21 [INFO] [stderr] Compiling pin-project-lite v0.2.6 [INFO] [stderr] Compiling futures-io v0.3.21 [INFO] [stderr] Compiling slab v0.4.3 [INFO] [stderr] Compiling bitflags v1.2.1 [INFO] [stderr] Compiling winapi-build v0.1.1 [INFO] [stderr] Compiling kernel32-sys v0.2.2 [INFO] [stderr] Compiling winapi v0.2.8 [INFO] [stderr] Compiling once_cell v1.10.0 [INFO] [stderr] Compiling ryu v1.0.5 [INFO] [stderr] Compiling ucd-trie v0.1.3 [INFO] [stderr] Compiling serde_json v1.0.64 [INFO] [stderr] Compiling walkdir v0.1.8 [INFO] [stderr] Compiling pest v2.1.3 [INFO] [stderr] Compiling itoa v0.4.7 [INFO] [stderr] Compiling cc v1.0.67 [INFO] [stderr] Compiling linked-hash-map v0.5.4 [INFO] [stderr] Compiling path-slash v0.1.4 [INFO] [stderr] Compiling copy_dir v0.1.2 [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling pathdiff v0.2.0 [INFO] [stderr] Compiling convert_case v0.4.0 [INFO] [stderr] Compiling yaml-rust v0.4.5 [INFO] [stderr] Compiling gio v0.14.0 [INFO] [stderr] Compiling base64 v0.13.0 [INFO] [stderr] Compiling cargo-emit v0.2.1 [INFO] [stderr] Compiling cmake v0.1.45 [INFO] [stderr] Compiling dunce v1.0.1 [INFO] [stderr] Compiling memoffset v0.6.4 [INFO] [stderr] Compiling matches v0.1.8 [INFO] [stderr] Compiling tinyvec_macros v0.1.0 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling tinyvec v1.2.0 [INFO] [stderr] Compiling unicode-bidi v0.3.5 [INFO] [stderr] Compiling gtk v0.14.0 [INFO] [stderr] Compiling semver-parser v0.10.2 [INFO] [stderr] Compiling percent-encoding v2.1.0 [INFO] [stderr] Compiling async-trait v0.1.53 [INFO] [stderr] Compiling aho-corasick v0.7.18 [INFO] [stderr] Compiling regex-syntax v0.6.25 [INFO] [stderr] Compiling form_urlencoded v1.0.1 [INFO] [stderr] Compiling atty v0.2.14 [INFO] [stderr] Compiling termcolor v1.1.2 [INFO] [stderr] Compiling humantime v2.1.0 [INFO] [stderr] Compiling diff v0.1.12 [INFO] [stderr] Compiling unicode-normalization v0.1.17 [INFO] [stderr] Compiling semver v0.11.0 [INFO] [stderr] Compiling rustc_version v0.3.3 [INFO] [stderr] Compiling field-offset v0.3.4 [INFO] [stderr] Compiling regex v1.5.4 [INFO] [stderr] Compiling idna v0.2.3 [INFO] [stderr] Compiling velcro_core v0.5.2 [INFO] [stderr] Compiling url v2.2.2 [INFO] [stderr] Compiling env_logger v0.9.0 [INFO] [stderr] Compiling thiserror-impl v1.0.25 [INFO] [stderr] Compiling strum_macros v0.21.1 [INFO] [stderr] Compiling futures-macro v0.3.21 [INFO] [stderr] Compiling velcro_macros v0.5.2 [INFO] [stderr] Compiling velcro v0.5.3 [INFO] [stderr] Compiling thiserror v1.0.25 [INFO] [stderr] Compiling futures-executor v0.3.21 [INFO] [stderr] Compiling futures v0.3.21 [INFO] [stderr] Compiling toml v0.5.8 [INFO] [stderr] Compiling serde_bytes v0.11.5 [INFO] [stderr] Compiling nativeshell_build v0.1.16 [INFO] [stderr] Compiling system-deps v3.2.0 [INFO] [stderr] Compiling proc-macro-crate v1.0.0 [INFO] [stderr] Compiling glib-macros v0.14.1 [INFO] [stderr] Compiling gtk3-macros v0.14.0 [INFO] [stderr] Compiling nativeshell v0.1.16 [INFO] [stderr] Compiling app_template v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Compiling glib-sys v0.14.0 [INFO] [stderr] Compiling gobject-sys v0.14.0 [INFO] [stderr] Compiling gio-sys v0.14.0 [INFO] [stderr] Compiling cairo-sys-rs v0.14.0 [INFO] [stderr] Compiling gdk-pixbuf-sys v0.14.0 [INFO] [stderr] Compiling pango-sys v0.14.0 [INFO] [stderr] Compiling gdk-sys v0.14.0 [INFO] [stderr] Compiling atk-sys v0.14.0 [INFO] [stderr] Compiling gtk-sys v0.14.0 [INFO] [stderr] error: failed to run custom build command for `app_template v0.1.0 (/opt/rustwide/workdir)` [INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation. [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/target/debug/build/app_template-27fb220d8ddd1481/build-script-build` (exit status: 101) [INFO] [stderr] --- stdout [INFO] [stderr] [INFO] [stderr] ** Build failed with error ** [INFO] [stderr] [INFO] [stderr] Couldn't find Flutter installation. Plase make sure 'flutter' executable is in PATH or specify 'flutter_path' in FlutterOptions [INFO] [stderr] [INFO] [stderr] --- stderr [INFO] [stderr] [INFO] [stderr] thread 'main' (1757) panicked at build.rs:26:9: [INFO] [stderr] explicit panic [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x5dfafb7ced4a - std[128c3efe2914e152]::backtrace_rs::backtrace::libunwind::trace [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9 [INFO] [stderr] 1: 0x5dfafb7ced4a - std[128c3efe2914e152]::backtrace_rs::backtrace::trace_unsynchronized:: [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14 [INFO] [stderr] 2: 0x5dfafb7ced4a - std[128c3efe2914e152]::sys::backtrace::_print_fmt [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:74:9 [INFO] [stderr] 3: 0x5dfafb7ced4a - <::print::DisplayBacktrace as core[6771d259883166e6]::fmt::Display>::fmt [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:44:26 [INFO] [stderr] 4: 0x5dfafb7e5dca - ::fmt [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/fmt/rt.rs:152:76 [INFO] [stderr] 5: 0x5dfafb7e5dca - core[6771d259883166e6]::fmt::write [INFO] [stderr] 6: 0x5dfafb7d5062 - std[128c3efe2914e152]::io::default_write_fmt:: [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/io/mod.rs:621:11 [INFO] [stderr] 7: 0x5dfafb7d5062 - ::write_fmt [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/io/mod.rs:1976:13 [INFO] [stderr] 8: 0x5dfafb7ae14f - ::print [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:47:9 [INFO] [stderr] 9: 0x5dfafb7ae14f - std[128c3efe2914e152]::panicking::default_hook::{closure#0} [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:292:27 [INFO] [stderr] 10: 0x5dfafb7c7c41 - std[128c3efe2914e152]::panicking::default_hook [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:319:9 [INFO] [stderr] 11: 0x5dfafb7c7dfb - std[128c3efe2914e152]::panicking::panic_with_hook [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:825:13 [INFO] [stderr] 12: 0x5dfafb7ad70c - std[128c3efe2914e152]::panicking::begin_panic::<&str>::{closure#0} [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:762:9 [INFO] [stderr] 13: 0x5dfafb7a30d9 - std[128c3efe2914e152]::sys::backtrace::__rust_end_short_backtrace::::{closure#0}, !> [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:182:18 [INFO] [stderr] 14: 0x5dfafb7a0170 - std[128c3efe2914e152]::panicking::begin_panic::<&str> [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:761:5 [INFO] [stderr] 15: 0x5dfafb69ef8f - build_script_build::main::hda51aa9d6a325004 [INFO] [stderr] 16: 0x5dfafb69f063 - core::ops::function::FnOnce::call_once::h40804660e6b42fd6 [INFO] [stderr] 17: 0x5dfafb69f006 - std::sys::backtrace::__rust_begin_short_backtrace::hdd9198755c1573da [INFO] [stderr] 18: 0x5dfafb69efe9 - std::rt::lang_start::{{closure}}::h7001028aae160dfc [INFO] [stderr] 19: 0x5dfafb7c6d34 - <&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe as core[6771d259883166e6]::ops::function::FnOnce<()>>::call_once [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/ops/function.rs:287:21 [INFO] [stderr] 20: 0x5dfafb7c6d34 - std[128c3efe2914e152]::panicking::catch_unwind::do_call::<&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe, i32> [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:581:40 [INFO] [stderr] 21: 0x5dfafb7c6d34 - std[128c3efe2914e152]::panicking::catch_unwind:: + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe> [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:544:19 [INFO] [stderr] 22: 0x5dfafb7c6d34 - std[128c3efe2914e152]::panic::catch_unwind::<&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe, i32> [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panic.rs:359:14 [INFO] [stderr] 23: 0x5dfafb7c6d34 - std[128c3efe2914e152]::rt::lang_start_internal::{closure#0} [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/rt.rs:175:24 [INFO] [stderr] 24: 0x5dfafb7c6d34 - std[128c3efe2914e152]::panicking::catch_unwind::do_call:: [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:581:40 [INFO] [stderr] 25: 0x5dfafb7c6d34 - std[128c3efe2914e152]::panicking::catch_unwind:: [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:544:19 [INFO] [stderr] 26: 0x5dfafb7c6d34 - std[128c3efe2914e152]::panic::catch_unwind:: [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panic.rs:359:14 [INFO] [stderr] 27: 0x5dfafb7c6d34 - std[128c3efe2914e152]::rt::lang_start_internal [INFO] [stderr] at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/rt.rs:171:5 [INFO] [stderr] 28: 0x5dfafb69efd1 - std::rt::lang_start::he5c29ae793dd6cc3 [INFO] [stderr] 29: 0x5dfafb69f0d5 - main [INFO] [stderr] 30: 0x73c524bed1ca - [INFO] [stderr] 31: 0x73c524bed28b - __libc_start_main [INFO] [stderr] 32: 0x5dfafb69ec05 - _start [INFO] [stderr] 33: 0x0 - [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] running `Command { std: "docker" "inspect" "dd6261307442e9e66223041dd6019d1b50a9fe4767d60492fbac455871ae01da", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "dd6261307442e9e66223041dd6019d1b50a9fe4767d60492fbac455871ae01da", kill_on_drop: false }` [INFO] [stdout] dd6261307442e9e66223041dd6019d1b50a9fe4767d60492fbac455871ae01da