Release 0.2.127#5219
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Since nightly >=2026-05-09 (rust-lang/rust#156061), wasm targets emit modern exnref exception-handling opcodes by default under -Cpanic=unwind. The wasm-bindgen 0.2.126 CLI bundles wasmparser 0.245.1, which rejects these opcodes with: type mismatch: catch_all_ref label must be a subtype of (ref exn) Work around this by passing -Cllvm-args=-wasm-use-legacy-eh via RUSTFLAGS at every worker-build --panic-unwind invocation site. worker-build reads existing RUSTFLAGS and appends -Cpanic=unwind, so the flag survives into the cargo subprocess. Placing it in .cargo/config.toml would not work: Cargo treats RUSTFLAGS env and target.<triple>.rustflags as mutually exclusive sources, and the env var (always set by worker-build) wins. This can be removed once wasm-bindgen ships a wasmparser that understands exnref (tracked in wasm-bindgen/wasm-bindgen#5219).
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Since nightly >=2026-05-09 (rust-lang/rust#156061), wasm targets emit modern exnref exception-handling opcodes by default under -Cpanic=unwind. The wasm-bindgen 0.2.126 CLI bundles wasmparser 0.245.1, which rejects these opcodes with: type mismatch: catch_all_ref label must be a subtype of (ref exn) Work around this by passing -Cllvm-args=-wasm-use-legacy-eh via RUSTFLAGS at every worker-build --panic-unwind invocation site. worker-build reads existing RUSTFLAGS and appends -Cpanic=unwind, so the flag survives into the cargo subprocess. Placing it in .cargo/config.toml would not work: Cargo treats RUSTFLAGS env and target.<triple>.rustflags as mutually exclusive sources, and the env var (always set by worker-build) wins. This can be removed once wasm-bindgen ships a wasmparser that understands exnref (tracked in wasm-bindgen/wasm-bindgen#5219).
mendess
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Since nightly >=2026-05-09 (rust-lang/rust#156061), wasm targets emit modern exnref exception-handling opcodes by default under -Cpanic=unwind. The wasm-bindgen 0.2.126 CLI bundles wasmparser 0.245.1, which rejects these opcodes with: type mismatch: catch_all_ref label must be a subtype of (ref exn) Work around this by passing -Cllvm-args=-wasm-use-legacy-eh via RUSTFLAGS at every worker-build --panic-unwind invocation site. worker-build reads existing RUSTFLAGS and appends -Cpanic=unwind, so the flag survives into the cargo subprocess. Placing it in .cargo/config.toml would not work: Cargo treats RUSTFLAGS env and target.<triple>.rustflags as mutually exclusive sources, and the env var (always set by worker-build) wins. This can be removed once wasm-bindgen ships a wasmparser that understands exnref (tracked in wasm-bindgen/wasm-bindgen#5219).
lukevalenta
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* Add sentry support * Update integration test wait time * Add panic-unwind to CI * Force legacy Wasm EH in --panic-unwind builds Since nightly >=2026-05-09 (rust-lang/rust#156061), wasm targets emit modern exnref exception-handling opcodes by default under -Cpanic=unwind. The wasm-bindgen 0.2.126 CLI bundles wasmparser 0.245.1, which rejects these opcodes with: type mismatch: catch_all_ref label must be a subtype of (ref exn) Work around this by passing -Cllvm-args=-wasm-use-legacy-eh via RUSTFLAGS at every worker-build --panic-unwind invocation site. worker-build reads existing RUSTFLAGS and appends -Cpanic=unwind, so the flag survives into the cargo subprocess. Placing it in .cargo/config.toml would not work: Cargo treats RUSTFLAGS env and target.<triple>.rustflags as mutually exclusive sources, and the env var (always set by worker-build) wins. This can be removed once wasm-bindgen ships a wasmparser that understands exnref (tracked in wasm-bindgen/wasm-bindgen#5219). * Add getrandom_03 wasm_js feature to witness_worker witness_worker transitively depends on getrandom 0.3.4 via generic_log_worker -> sentry-core -> rand 0.9 -> rand_core 0.9. Without the wasm_js feature, getrandom 0.3.4 emits a compile_error! on wasm32-unknown-unknown. ct_worker and bootstrap_mtc_worker already carry this dependency for feature unification; witness_worker was missing it. * cargo shear * Remove longer time
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Fixed
Fixed compilation with
(feature = "std", panic = "unwind", target_feature = "atomics")and prevented a
Taskleak when a future unwinds out ofpoll(via a Rustpanic or a foreign JS exception) in both the single-threaded and
multi-threaded executors.
#5214
Emscripten output now reaches wasm exports through emscripten's
wasmExportsobject using bracket (string-literal) access (
wasmExports['__wbindgen_start'])instead of a local
wasmalias with dot access.wasmExports['name']is theform emcc's DCE graph roots and its import/export minifier renames in the JS
and the wasm together, so the glue now survives and stays consistent under
-O3/-Os(previously the export names were minified without updating the JScall sites, e.g.
__wbindgen_start is not defined).#5217
The emscripten detection marker static is no longer leaked as public API.
#5220
#5222