This code inspection checks violations of your preferences for using var or explicit type in local variable declarations. Specifically, it checks variable declarations of simple types (types without generic type parameters).
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For variable declarations of other types, ReSharper provides similar code inspections, which you can configure separately.
Using implicitly typed local variables (also known as var keyword) introduced in C# 3.0 has become quite popular as it improves readability in many scenarios. By default, ReSharper also encourages using of var keyword, but preferences of its usage are flexibly configurable — for example, you can opt for using explicit types in specific cases or everywhere and ReSharper will help you enforce your preferences.
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