Rust: error[E0463]: can't find crate for core (wasm32-unknown-unknown target not installed)
error[E0463]: can't find crate for `core`
|
= note: the `wasm32-unknown-unknown` target may not be installed
= help: run `rustup target add wasm32-unknown-unknown`
Immediate Remediation
bash
# 1. Install wasm32 compilation target via rustup: rustup target add wasm32-unknown-unknown # 2. If using wasm-pack: cargo install wasm-pack wasm-pack build --target web
Root Cause Analysis
The Rust toolchain was compiling for WebAssembly target wasm32-unknown-unknown, but the target standard library precompiled crates have not been added to the active rustup profile.
Verification & Guardrails
- In CI workflows, add a step: rustup target add wasm32-unknown-unknown before cargo build.
- Ensure rustup toolchain is updated: rustup update stable.
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