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Update the LLVM license mentioned in COPYRIGHT
LLVM has relicensed their codebase. Remove the old UIUC license text from the LLVM section and include the licensing text used by LLVM itself.
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COPYRIGHT

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@@ -23,10 +23,252 @@ The Rust Project includes packages written by third parties.
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The following third party packages are included, and carry
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their own copyright notices and license terms:
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* LLVM. Code for this package is found in src/llvm-project.
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* LLVM, located in src/llvm-project, is licensed under the following
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terms.
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Copyright (c) 2003-2013 University of Illinois at
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Urbana-Champaign. All rights reserved.
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==============================================================================
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The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
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==============================================================================
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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and distribution as defined by Sections 1 through 9 of this document.
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"Licensor" shall mean the copyright owner or entity authorized by
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the copyright owner that is granting the License.
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"Legal Entity" shall mean the union of the acting entity and all
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other entities that control, are controlled by, or are under common
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control with that entity. For the purposes of this definition,
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"control" means (i) the power, direct or indirect, to cause the
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direction or management of such entity, whether by contract or
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outstanding shares, or (iii) beneficial ownership of such entity.
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"You" (or "Your") shall mean an individual or Legal Entity
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exercising permissions granted by this License.
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Copyright [yyyy] [name of copyright owner]
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---- LLVM Exceptions to the Apache 2.0 License ----
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the License, but only in their entirety and only with respect to the Combined
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Software.
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==============================================================================
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Software from third parties included in the LLVM Project:
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==============================================================================
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The LLVM Project contains third party software which is under different license
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terms. All such code will be identified clearly using at least one of two
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mechanisms:
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1) It will be in a separate directory tree with its own `LICENSE.txt` or
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`LICENSE` file at the top containing the specific license and restrictions
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which apply to that software, or
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2) It will contain specific license and restriction terms at the top of every
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file.
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==============================================================================
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Legacy LLVM License (https://llvm.org/docs/DeveloperPolicy.html#legacy):
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==============================================================================
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University of Illinois/NCSA
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Open Source License
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Copyright (c) 2003-2019 University of Illinois at Urbana-Champaign.
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All rights reserved.
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Developed by:
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http://llvm.org
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Permission is hereby granted, free of charge, to any
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person obtaining a copy of this software and associated
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documentation files (the "Software"), to deal with the
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Software without restriction, including without
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limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software
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is furnished to do so, subject to the following
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conditions:
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* Redistributions of source code must retain the
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above copyright notice, this list of conditions
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and the following disclaimers.
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* Redistributions in binary form must reproduce the
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above copyright notice, this list of conditions
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and the following disclaimers in the documentation
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and/or other materials provided with the
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distribution.
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* Neither the names of the LLVM Team, University of
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Illinois at Urbana-Champaign, nor the names of its
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contributors may be used to endorse or promote
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products derived from this Software without
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specific prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE
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FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS WITH THE SOFTWARE.
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* Additional libraries included in LLVM carry separate
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BSD-compatible licenses. See src/llvm-project/llvm/LICENSE.TXT
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for details.
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal with
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimers.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimers in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the LLVM Team, University of Illinois at
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Urbana-Champaign, nor the names of its contributors may be used to
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endorse or promote products derived from this Software without specific
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prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
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SOFTWARE.
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* Portions of the FFI code for interacting with the native ABI
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is derived from the Clay programming language, which carries

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