private BoundExpression BindConversion(TextSpan diagnosticSpan, BoundExpression expression, TypeSymbol type, bool allowExplicit = false)
{
var conversion = Conversion.Classify(expression.Type, type);
if (!conversion.Exists)
{
if (expression.Type != TypeSymbol.Error && type != TypeSymbol.Error)
{
_diagnostics.ReportCannotConvert(diagnosticSpan, expression.Type, type);
}
return(new BoundErrorExpression());
}
if (!allowExplicit && conversion.IsExplicit)
{
_diagnostics.ReportCannotConvertImplicitly(diagnosticSpan, expression.Type, type);
}
if (conversion.IsIdentity)
{
return(expression);
}
return(new BoundConversionExpression(type, expression));
}
