Back in February, we wrote a State of the union about ReSharper C# 7 support, based on ReSharper 2016.3. Since then, a number of improvements have been made, both to C# as well as ReSharper (and Rider, which gets language support updates from ReSharper for free).
ReSharper 2017.1 and 2017.2 both bring better support for C# 7.0 and C# 7.1, with a number of new inspections, quick-fixes and context actions. ReSharper understands the new syntax and constructs that C# 7.0 and C# 7.1 bring, and ties them into existing and new inspections, quick-fixes, navigation and refactorings:
Binary liter