| # Copyright 2020 The Bazel Authors. All rights reserved. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Used by top-level exports.bzl.""" |
| |
| def dict_union(*dicts): |
| """Returns the strict union of zero or more dicts.""" |
| result = {} |
| for d in dicts: |
| for k, v in d.items(): |
| if k in result: |
| fail("Duplicate key: '%s'" % k) |
| result[k] = v |
| return result |
