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331 B
C#
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// CS4015: `C.SynchronousCall(int)': Async methods cannot use `MethodImplOptions.Synchronized'
// Line: 9
using System.Threading.Tasks;
using System.Runtime.CompilerServices;
class C
{
[MethodImplAttribute(MethodImplOptions.Synchronized)]
public static async Task SynchronousCall (int arg)
{
await Task.FromResult (1);
}
}