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deps/v8/test/mjsunit/regress/wasm/regress-729991.js

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+// Copyright 2017 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.
+
+d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
+
+let builder = new WasmModuleBuilder();
+builder.addCustomSection('BBBB', []);
+builder.addCustomSection('AAAA', new Array(32).fill(0));
+let buffer = builder.toBuffer();
+// Shrink the buffer by 30 bytes (content of the unknown section named 'AAAA').
+buffer = buffer.slice(0, buffer.byteLength - 30);
+// Instantiation should fail on the truncated buffer.
+assertThrows(() => new WebAssembly.Module(buffer), WebAssembly.CompileError);