Microsoft.CodeAnalysis.Analyzers.UseCoalesceExpression.AbstractUseCoalesceExpressionForIfNullStatementCheckDiagnosticAnalyzer<TSyntaxKind, TExpressionSyntax, TStatementSyntax, TVariableDeclarator, TIfStatementSyntax>.IsNullCheck(TExpressionSyntax, out TExpressionSyntax)