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operator<< works from the global namespace

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Since https://github.com/catchorg/Catch2/pull/1405 was merged and propagated to the single include declaring a user operator<< in the global namespace makes it available to Catch2 string converters.
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docs/tostring.md
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@ -23,7 +23,7 @@ std::ostream& operator << ( std::ostream& os, T const& value ) {
(where ```T``` is your type and ```convertMyTypeToString``` is where you'll write whatever code is necessary to make your type printable - it doesn't have to be in another function).
You should put this function in the same namespace as your type and have it declared before including Catch's header.
You should put this function in the same namespace as your type, or the global namespace, and have it declared before including Catch's header.
## Catch::StringMaker specialisation
If you don't want to provide an ```operator <<``` overload, or you want to convert your type differently for testing purposes, you can provide a specialization for `Catch::StringMaker<T>`: