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unknown user pushed a change to branch redi/concepts-cxx2a in repository gcc.

at ef9b45bf80c Adjust std::assignable_from for P1452R2 support

This branch includes the following new commits:

new 836762fd472 Use __is_same_as for std::is_same and std::is_same_v new 6b2aa44bf85 Implement <concepts> header for C++20 new 2b1fc07efc1 tests for Concepts clause new ef9b45bf80c Adjust std::assignable_from for P1452R2 support

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