What is the Rust WebAssembly change about?

Rust's dropping `--allow-undefined` from `wasm-ld` in all Wasm targets, making undefined symbols link-time errors like native platforms.

When does Rust 1.96 release?

Nightly hits soon; stable drops May 28, 2026.

Will the Rust Wasm change break my projects?

Likely not runtime, but link failures on misconfigs — better early than late.

💻 Programming Languages

Rust Tightens WebAssembly Screws: No More Undefined Symbols After All These Years

Rust devs building for WebAssembly? Brace for linker errors that won't let undefined symbols slide anymore. The Rust team's April bulletin spells out the shift landing in nightly soon.

theAIcatchup Apr 08, 2026 3 min read

⚡ Key Takeaways

Rust removes `--allow-undefined` flag from WebAssembly targets in 1.96, aligning with native linker behavior. 𝕏
Expect better diagnostics but potential build breaks for projects with sloppy symbol handling. 𝕏
This maturity step mirrors past toolchain cleanups, strengthening Rust's Wasm dominance. 𝕏

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#Rust 1.96 #WebAssembly #breaking changes #rust #wasm-ld

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Originally reported by InfoWorld

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