Mettle C++ Test Framework's use of undescore

 

This question already has an answer here:

  • What are the rules about using an underscore in a C++ identifier? 5 answers

    • Is there something special going on with the use of underscore

    Underscore is a valid character to use in an identifier. Some uses of underscore in an identifier are reserved for the implementation: What are the rules about using an underscore in a C++ identifier? But none of those apply to a single underscore in block scope.

    is it a valid variable name?

    Here, yes. It wouldn't be in global namespace.

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