public static ImplicitSingleStatementBranches TryGetIfStatementBranches_BothSingle(IfStatementSyntax syntax)
{
var trueAction = syntax.Statement.CollapsedStatements().SingleOrDefaultAllowMany();
if (trueAction == null) return null;
var falseAction = syntax.ElseStatementOrEmptyBlock().CollapsedStatements().SingleOrDefaultAllowMany();
if (falseAction == null) return null;
return new ImplicitSingleStatementBranches(trueAction, falseAction, syntax);
}