population_bimap example fails to compile
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- C++
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Description
gcc 11.4 fails to compile this example with an error `template argument 1 is invalid` on this line:
https://github.com/boostorg/bimap/blob/e5c2657a9e2d6184622ad4ccd1373e6c60a7efca/example/population_bimap.cpp#L46
Specifying the Boost namespace on `optional` fixes it (you cannot use std here).
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