JSTests/test262/test/annexB/language/function-code/block-decl-nested-blocks-with-fun-decl.js

// Copyright (C) 2018 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-web-compat-functiondeclarationinstantiation
description: >
  Nested function declarations, the second declaration is not Annex-B applicable.
info: |
  B.3.3.1 Changes to FunctionDeclarationInstantiation

  1. If strict is false, then
    a. For each FunctionDeclaration f that is directly contained in the
       StatementList of a Block, CaseClause, or DefaultClause, do
      i. Let F be StringValue of the BindingIdentifier of FunctionDeclaration f.
      ii. If replacing the FunctionDeclaration f with a VariableStatement that
          has F as a BindingIdentifier would not produce any Early Errors for
          func and F is not an element of parameterNames, then
       ...
flags: [noStrict]
---*/

function g() {
    // Create an outer block-statement.
    {
        // A lexically declared function declaration.
        // This function is applicable for Annex-B semantics.
        function f() { return 1; }

        // An inner block-statement with another function declaration.
        // This function is not applicable for Annex-B semantics, because
        // replacing it with |var f| would result in a SyntaxError.
        {
            function f() { return 2; }
        }
    }

    assert.sameValue(f(), 1);
}

g();