{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"if"}]}
    if sess.is_nightly_build() && sess.opts.unstable_opts.emscripten_wasm_eh {
    // Nightly-only implementation detail for the `panic_unwind` and `unwind` crates.
        ins_none!(sym::emscripten_wasm_eh);