Bug: Error with num coercion in MicroHS kernel

[aneilmac]

Repro Steps

1. Have the MicroHS kernel running
2. Use the following snippet

   newtype Apple = Apple Int deriving (Show, Num) 
   
   (1 :: Apple) + (2 :: Apple)

3. Observe that following error:

   Runtime error: error: "<repl>": line 7, col 43: undefined value: B@.coerce
   

This error is more severe than normal as all cells return the above error once it is encountered, the only fix is resetting the kernel.

I can confirm that the GHC kernel is not affected and correctly returns 3.