Fix test for gcc-5.3.0
Created by: masterleinad
It seems like gcc prior to version 6.1.0 requires explicit constructiors here, see https://godbolt.org/z/JqEKVT.
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Created by: masterleinad
It seems like gcc prior to version 6.1.0 requires explicit constructiors here, see https://godbolt.org/z/JqEKVT.