Creating a symbol analyzer to report issues about symbol declarations

A symbol analyzer registers action callbacks to analyze one or more kinds of symbol declarations, such as types, methods, fields, properties, events, and so on, reports semantic issues about declarations.

In this section, we will create a symbol analyzer that extends the compiler diagnostic CS0542 (member names cannot be the same as their enclosing type) to report a diagnostic if member names are the same as any of the outer parent type. For example, the analyzer will report a diagnostic for the innermost type NestedClass here:

public class NestedClass
{
  public class InnerClass
  {
    public class NestedClass
    {
    }
  }
}