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Detail::rangeToString is now defined after the various toString
overloads. This results in them being accessible with rangeToString is
instantiated (in this case, by StringMaker<vector>). This (sort-of)
fixes the problem where contained types are toString'd incorrectly.
Consider:
std::vector<std::string> v { "abc" };
Before:
Catch::toString( v ) == "{ abc }"
After:
Catch::toString( v ) == "{ "abc" }"
(note the extra pair of quotes around the "abc" - these are added by
Catch::toString( std::string ) which is now called by rangeToString)