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Openarray: internal compiler error when accessing length if not a param #9281

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mratsim opened this issue Oct 10, 2018 · 0 comments

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commented Oct 10, 2018

If we try to access the length of an openarray that wasn't passed as a function parameter we crash.

Building on the example from #9279

template boundedOpenArray[T](x: seq[T], first, last: int): openarray[T] =
  toOpenarray(x, max(0, first), min(x.high, last))


proc foo[T](x: openarray[T]) =
  echo x.len

let a = @[1, 2, 3]

# a.boundedOpenArray(1, 2).foo()  # Works
echo a.boundedOpenArray(1, 2).len # Internal compiler error
Error: internal error: genMagicExpr: mSlice
No stack traceback available
To create a stacktrace, rerun compilation with ./koch temp c <file>

@Araq Araq closed this in d48e964 Oct 11, 2018

krux02 added a commit to krux02/Nim that referenced this issue Oct 15, 2018

narimiran added a commit to narimiran/Nim that referenced this issue Oct 31, 2018

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