gc:arc: lib\pure\os.nim Hint [Performance]

[SFR0815]

While compiling (on windows) with --gc:arc performance related hints are generated by the compiler

Example

ding.nim:

import os
discard os.paramStr(0)
discard os.parseCmdLine("ding")

nim c --gc:arc ding.nim

Current Output

The following hints apprear on the console:

...\.choosenim\toolchains\nim-1.4.2\lib\pure\os.nim(2764, 64) Hint: passing 'ownArgv[i]' to a sink parameter introduces an implicit copy; if possible, rearrange your program's control flow to prevent it [Performance]
...\.choosenim\toolchains\nim-1.4.2\lib\pure\os.nim(2669, 17) Hint: passing 'a' to a sink parameter introduces an implicit copy; if possible, rearrange your program's control flow to prevent it [Performance]

Expected Output

nothing

[timotheecour]

not windows specific

[ringabout]

There are no warnings on devel.