strbasics.strip SIGBUS with --gc:arc

[timotheecour]

Example

import std/strbasics
var a = "  vhellov   "
strip(a)

Current Output

Traceback (most recent call last)
/Users/timothee/git_clone/nim/timn/tests/nim/all/t11905.nim(7) t11905
/Users/timothee/git_clone/nim/Nim_devel/lib/std/strbasics.nim(97) strip
/Users/timothee/git_clone/nim/Nim_devel/lib/std/strbasics.nim(67) setSlice
SIGBUS: Illegal storage access. (Attempt to read from nil?)

Expected Output

works

Additional Information

1.5.1 e9a287f