Microsoft.CodeAnalysis.Shared.Utilities.AbstractSpeculationAnalyzer<TExpressionSyntax, TTypeSyntax, TAttributeSyntax, TArgumentSyntax, TForEachStatementSyntax, TThrowStatementSyntax, TInvocationExpressionSyntax, TConversion>.ReplacementIntroducesDisallowedNullType(TExpressionSyntax, TExpressionSyntax, Microsoft.CodeAnalysis.TypeInfo, Microsoft.CodeAnalysis.TypeInfo)