protected override SignatureHelpModel GetModel(SemanticModel semanticModel, CoalesceExpressionSyntax node, int position)
{
var span = node.Span;
var signature = SignatureHelpExtensions.GetCoalesceSignatureItem();
var signatures = new[] { signature };
var parameterIndex = node.ArgumentList.GetParameterIndex(position);
return(new SignatureHelpModel(span, signatures, signature, parameterIndex));
}
protected override IEnumerable <SignatureItem> GetExpectedSignatures(SemanticModel semanticModel)
{
yield return(SignatureHelpExtensions.GetCoalesceSignatureItem());
}