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Created attachment 16083 [details]
Execute enclosed test
It fails with
System.MethodAccessException: Method `Ex:Private ()' is inaccessible from method `X/<Foo>c__async0:MoveNext ()'
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine] (TStateMachine& stateMachine) <0x9320e8 + 0x000d3> in <filename unknown>:0
at X.Foo () <0x92f290 + 0x000bb> in <filename unknown>:0
at M.Main () <0x92f188 + 0x00027> in <filename unknown>:0
which is wrong because 'System.MethodAccessException' does not happen within "::Start" method but inside "::MoveNext" method.
.NET handles this correctly and throws
System.AggregateException: One or more errors occurred. ---> System.MethodAccessException: Attempt by method 'X+<Foo>c__async0.MoveNext()' to access method 'Ex.Private()' failed.
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
Why this matters is that Mono at the end throws different exception than .net
Created attachment 16084 [details]
Fixed in mono master.