using Microsoft.CSharp.RuntimeBinder.Syntax; namespace Microsoft.CSharp.RuntimeBinder.Semantics { internal sealed class ExprConcat : ExprWithType { public Expr FirstArgument { get; set; } public Expr SecondArgument { get; set; } public ExprConcat(Expr first, Expr second) : base(ExpressionKind.Concat, TypeFromOperands(first, second)) { FirstArgument = first; SecondArgument = second; } private static CType TypeFromOperands(Expr first, Expr second) { CType type = first.Type; if (type.IsPredefType(PredefinedType.PT_STRING)) return type; return second.Type; } } }