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We somehow can't compile this anymore:
static void Main ()
new X509Certificate2 (new byte , string.Empty);
If fails with an error message
B.cs(8,3): error CS7069: Reference to type `System.Security.SecureString' claims it is defined assembly `mscorlib, Version=220.127.116.11, Culture=neutral, PublicKeyToken=7cec85d7bea7798e', but it could not be found
Tested with 4.2.2, master and 4.3.2.
I cannot reproduce this with master and 18.104.22.168 indicates you have some mix of mobile dlls there.
You can try `mcs --mcs-debug 9` if that reveals anything
Turns out I had some BCL's in the directory I tried to build in.