lloyd konneker

enhance load_string return result of last eval

My mistake, it does allocate cells the sizeof(cell), not size ADJ. So it is NOT using excessive memory for cell structs. But I would still like to understand why it uses ADJ.

Memory allocation for struct cell is excessive

Enhance error messages for mismatched parens

(quit 1) does not write an error message

#f is atom

compliance of quotient, modulo, remainder to r5rs