Missing bounds check in array slicing

[arnetheduck]

Description

var v: array[1, byte]

var p = cast[ptr array[0, byte]](addr v)

echo toOpenArray(p[], 1, 2)

this should obviously cause defect but doesn't, neither at compile nor at runtime

Nim Version

1.6.8, devel

Current Output

No response

Expected Output

No response

Possible Solution

No response

Additional Information

No response

[juancarlospaco]

!nim c

var v: array[1, byte]
var p = cast[ptr array[0, byte]](addr v)
echo toOpenArray(p[], 1, 2)

[github-actions]

@juancarlospaco (contributor)

devel :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:01
• Finished 2023-07-11T19:21:02
• Duration 1 minute
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

stable :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:02
• Finished 2023-07-11T19:21:03
• Duration 1 minute
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

1.6.0 :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:05
• Finished 2023-07-11T19:21:06
• Duration 1 minute
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

1.4.0 :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:09
• Finished 2023-07-11T19:21:09
• Duration 1 minute
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

1.2.0 :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:25
• Finished 2023-07-11T19:21:25
• Duration now
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

1.0.0 :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:38
• Finished 2023-07-11T19:21:38
• Duration now
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

0.20.2 :+1: OK

Output

[0, 0]

Stats

• Created 2023-07-11T19:20:31Z
• Started 2023-07-11T19:21:52
• Finished 2023-07-11T19:21:52
• Duration 1 minute
• Commands nim c --run -d:strip -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --threads:off --verbosity:0 --hints:off --warnings:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

🤖 Bug found in 54 minutes bisecting 7 commits at 0 commits per second.