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Cannot compute sizeof generic type in alias #24045

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arnetheduck opened this issue Sep 2, 2024 · 1 comment
Open

Cannot compute sizeof generic type in alias #24045

arnetheduck opened this issue Sep 2, 2024 · 1 comment
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Needs Backporting/Fixed in Devel The issues can be solved via backporting works_but_needs_test_case

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@arnetheduck
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Description

type ArrayBuf*[N: static int, T] = object
  buf: array[N, T]

func maxLen(T: type): int =
  sizeof(T) * 2

type MyBuf[I: type] = ArrayBuf[maxLen(I), byte]

var v: MyBuf[int]

note I: type in alias - removing it gives #24043 instead

Nim Version

2.0.8

Current Output

testit.nim(5, 9) Error: 'sizeof' requires '.importc' types to be '.completeStruct'

Expected Output

No response

Known Workarounds

No response

Additional Information

No response
@arnetheduck arnetheduck changed the title Cannot compute sizeof generic type, Cannot compute sizeof generic type in alias Sep 2, 2024
arnetheduck added a commit to status-im/nim-stew that referenced this issue Sep 2, 2024
@arnetheduck
lots of bugs in nim
0c55600 
* nim-lang/Nim#24043
* nim-lang/Nim#24044
* nim-lang/Nim#24045
@ringabout ringabout added the Needs Backporting/Fixed in Devel The issues can be solved via backporting label Sep 2, 2024
@metagn
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metagn commented Sep 2, 2024 •
edited
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Would guess fixed by #23983 but not sure

Probably shouldn't backport but add test case instead

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@arnetheduck @metagn @ringabout