Cannot obtain value of local or argument as it is not available at this instruction pointer, possibly because it has been optimized away

Question

Visual Studio 2010 kills (there is no other word) data in one of the arguments of the function in the unsafe block. What could cause this error? The following message shows

Answer 1

Also In VS 2015 Community Edition

go to Debug->Options or Tools->Options

and check Debugging->General->Suppress JIT optimization on module load (Managed only)