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Bug with range() and unsigned indices #44895

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Bug with range() and unsigned indices#44895
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bugIndicates an unexpected problem or unintended behaviorcorrectness bug ⚠Bugs that are likely to lead to incorrect results in user code without throwingrangesEverything AbstractRange
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1.10
@gerw

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@gerw
gerw
opened on Apr 7, 2022

The snippet

x = range(-1,1,length=11)
x[UInt(1)]

gives 3.6893488147419105e18 instead of the expected -1.0.

The problem seems to be

julia/base/range.jl

Line 939 in 0d29712

u = i - r.offset
, since UInt(1) - 6 underflows.

julia> versioninfo()
Julia Version 1.6.2
Commit 1b93d53fc4 (2021-07-14 15:36 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, skylake)

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    bugIndicates an unexpected problem or unintended behaviorcorrectness bug ⚠Bugs that are likely to lead to incorrect results in user code without throwingrangesEverything AbstractRange

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