text: // Copyright 2018 the V8 project authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // Flags: --expose-wasm --experimental-wasm-eh
  
  load("test/mjsunit/wasm/wasm-constants.js");
  load("test/mjsunit/wasm/wasm-module-builder.js");
  
  // Prepare a special error object to throw.
  var error = new Error("my error");
  error.__proto__ = new Proxy(new Error(), {
    has(target, property, receiver) {
      assertUnreachable();
    }
  });
  
  // Throw it through a WebAssembly module.
  var builder = new WasmModuleBuilder();
  builder.addImport('mod', 'fun', kSig_v_v);
  builder.addFunction("funnel", kSig_v_v)
         .addBody([kExprCallFunction, 0])
         .exportFunc();
  var instance = builder.instantiate({ mod: {fun: function() { throw error }}});
  assertThrows(instance.exports.funnel, Error);
  