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C++ attribute: fallthrough (since C++17)

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(C++23)
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fallthrough
(C++17)
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(C++20)
(C++17)
(C++17)
(C++11)
(C++20)
(TM TS)
(C++20)
 

Indicates that the fall through from the previous case label is intentional and should not be diagnosed by a compiler that warns on fallthrough.

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