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v0.68: compiler bug fixes, improved efficiency ...

- Fixed indentation of VM code. Turned on stack checks for GCC only.
- Added new `VM_DISCARD` VM instruction (and compiler support).  This makes the VM significantly more efficient.
- Configured Linux VM to be compatible with Apple II environment.
- Added line to force to interpret mode to prevent surprises.
- Compiler: fixed bug when exiting `for` loop using `return`.  The compiler was leaking a word on the evalutation stack after jumping out of the body of the `for` loop.

2018-05-13 13:59:40 -04:00

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