`.bycopy.` was originally in the pragma for all the C types. I removed any 
pragma that didn't seem to help to not obfuscate the issue. The code segfaults 
in `dump_ast` at the switch statement. The first 32 bits made me think that it 
was `ntype` a c integer that was the issue but I don't think so now. Lemon 
produces a header in this case called `calc.h` of token types: 
    
    
    #define ADD                              1
    #define SUB                              2
    #define MUL                              3
    #define DIV                              4
    #define LPAR                             5
    #define RPAR                             6
    #define NUM                              7
    
    
    Run

which the Makefile evokes `c2nim` to create `calc.nim`: 
    
    
    const
      ADD* = 1
      SUB* = 2
      MUL* = 3
      DIV* = 4
      LPAR* = 5
      RPAR* = 6
      NUM* = 7
    
    
    Run

The reason I don't think this is the issue is that I hard coded the c int's to 
their actual values in both `calc.y` and `main.nim` and got the same result.

Thank you both for your input.

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