Re^4: what difference between eval and do ?

I didn't take the title literally. The OP appears to asking why do BLOCK and eval BLOCK behave differently in the provided code. I did not set to list all the difference between eval BLOCK and do BLOCK, at least one of which hasn't been mentioned yet (do BLOCK's interaction with the while statement modifier).

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Re^5: what difference between eval and do ? by Anonymous Monk on Apr 21, 2018 at 13:58 UTC
But your code already perfectly show the difference and the underlining reason between eval and do: they both return the value of the last statement in the block, eval is sub-call, so it copy the last value and return it; and do is a bit like a named block. that's it.	[reply]
Re^6: what difference between eval and do ? by ikegami (Patriarch) on Apr 24, 2018 at 14:14 UTC
Nope, it only illustrates an inconsequential difference I didn't even know about before the OP posted it.	[reply]