33 lines
479 B
C#
33 lines
479 B
C#
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using System.Collections.Generic;
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class Expr
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{
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public int Field;
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}
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static class X
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{
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public static IEnumerable<int> Test (Expr expr)
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{
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object exprCur = expr;
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if (exprCur is Expr list) {
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yield return list.Field;
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}
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}
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public static IEnumerable<string> Test2 (int? expr)
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{
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int? exprCur = expr;
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while (exprCur != null) {
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if (exprCur is int list) {
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yield return list.ToString ();
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}
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}
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}
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public static void Main ()
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{
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Test (null);
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Test2 (3);
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}
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}
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