Strange bug when linking foreign functions ( Bad file descriptor )

[SrMordred]

Odin Report:

        Odin: dev-2021-11-nightly:bb7703fc
        OS:   Windows 10 Professional (version: 20H2), build 19042.1348
        CPU:  AMD Ryzen 5 1600 Six-Core Processor
        RAM:  16314 MiB

Error example

package main

import "core:fmt"

foreign import "system:libucrt.lib"
@(default_calling_convention = "stdcall")
foreign libucrt {
    _execlp :: proc( file: cstring, arg: cstring, #c_vararg args: ..any ) -> uintptr ---;
}

main :: proc () {
    err := _execlp( "dir", "dir", nil ); //comment here
    fmt.print("oi?"); 
}

Output:

dir: write error: Bad file descriptor

Commenting the cited line 'unbug' the output.

[gingerBill]

Does this work if you change the signature to this?

_execlp :: proc( file: cstring, arg: cstring, #c_vararg args: ..cstring) -> uintptr ---

[gingerBill]

My hunch is that the passed nil is actually getting passed as a nil any e.g. any{}.

[SrMordred]

Changing the signature didn´t change the error. Also, calling like this _execlp( "dir", "dir") crashes the program. (exit code -1073741819)

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