As a programming exercise I'm trying to use the State monad to create a simple
parser. It's for a very simple assembly language for a simple virtual machine.
The state is a string of instructions. I want to be able to call something
like getNextInstruction to pull out the next instruction and then update the
state (string). I know I can do this non-monadically by just passing the
string explicitly each time but I'd like to learn more about the State monad.
I also know about Parsec and Happy and so forth but this is just an exercise so
I want to do it this way. Any ideas? I can't seem to get anything to work.
I've tried different things but I suspect I'm just missing something basic.
Can someone post a simple prototype for this? Just assume the instructions are
integers.
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