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Consider issuing a warning when a bare integer is used in Cat() or Repl() #639

whitequark opened this issue Oct 2, 2021 · 2 comments


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In general, using bare integers in bit vector context is error-prone because the width of the integer, when cast to a Value, will change with its value. Values other than 0 and 1 are very likely to indicate a potential issue. Whether we want to allow 0 and 1 is an open question, but I suspect that people are relying on that.

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I've definitely used 0 and 1 inside Cat a bunch for adding an extra bit, in situations like the UART example where it's convenient for shift registers, but it's not that bad to use Const either. I think the meaning is pretty clear with 0 and 1 though.

I checked and about 10% of my Cat calls use a bare 0 or 1.

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Okay, definitely no warning on bare 0 or 1.

@whitequark whitequark added this to the 0.3 milestone Dec 11, 2021
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