dualfroz
8c8b8caad8
When the extension method call cannot be written without type arguments (another extension method with the same name and a different arity is found first), the call falls back to the static form. For 'a?.M()' that fallback produced 'Enumerable.Count(s?)', which is not valid C#. Writing the type arguments excludes the extension methods of a different arity, so for a null-conditional target the type arguments are tried before giving up.