JSTests/wasm/regress/unmatched-else.js

try {
    new WebAssembly.Module(new Uint8Array([0, 97, 115, 109, 1, 0, 0, 0, 1, 7, 1, 96, 3, 127, 127, 127, 0, 2, 12, 1, 2, 106, 115, 3, 109, 101, 109, 2, 1, 1, 1, 3, 2, 1, 0, 6, 1, 0, 7, 13, 1, 9, 100, 111, 95, 109, 101, 109, 99, 112, 121, 0, 0, 10, 57, 1, 55, 1, 1, 127, 65, 0, 33, 3, 3, 64, 2, 64, 32, 2, 32, 3, 70, 13, 0, 5, 1, 65, 4, 108, 32, 3, 65, 4, 108, 106, 32, 0, 32, 3, 65, 4, 108, 106, 40, 0, 0, 54, 0, 0, 32, 3, 65, 1, 0, 0, 0, 0, 0, 0, 0, 0 ]));
    throw new Error('Module should have failed validation');
} catch (err) {
    if (err.message != "WebAssembly.Module doesn't validate: else block isn't associated to an if, in function at index 0 (evaluating 'new WebAssembly.Module')")
        throw err;
}