arrays.concat doesn't work as expected with empty interface types

[einar-hjortdal]

Describe the bug

import arrays

interface AnythingGoes{ }

mut the_one_array := []AnythingGoes{}

some_string := 'It would suck'
another_string := 'if I was forced'
last_string := 'to << every var into the array'
random_int := 69

// this produces an error, but it shouldn't!
the_one_array = arrays.concat(the_one_array, some_string, another_string, last_string, random_int)

// this works but it sucks
the_one_array = arrays.concat(
	the_one_array, 
	AnythingGoes(some_string), 
	AnythingGoes(another_string), 
	AnythingGoes(last_string), 
	AnythingGoes(random_int)
	) 

// this also works and it sucks
the_one_array << some_string
the_one_array << another_string
the_one_array << last_string
the_one_array << random_int

println(the_one_array)

Reproduction Steps

Run code above, one apoproach at a time

Expected Behavior

the_one_array = arrays.concat(the_one_array, some_string, another_string, last_string, random_int) should just work

Current Behavior

the_one_array = arrays.concat(the_one_array, some_string, another_string, last_string, random_int) produces errors

Possible Solution

No response

Additional Information/Context

No response

V version

Current V version: V 0.4.3 29eda89, timestamp: 2023-11-23 16:07:00 +0200

Environment details (OS name and version, etc.)

V full version: V 0.4.3 95509cf.29eda89
OS: linux, Linux version 5.14.0-362.8.1.el9_3.x86_64 (mockbuild@pp-el9) (gcc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2), GNU ld version 2.35.2-42.el9) #1 SMP PREEMPT_DYNAMIC Tue Nov 7 18:43:14 CET 2023
Processor: 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz

getwd: /home/jdb/Documents/projects/vlang/redis
vexe: /home/jdb/.local/lib64/v/v
vexe mtime: 2023-11-23 14:16:00

vroot: OK, value: /home/jdb/.local/lib64/v
VMODULES: OK, value: /home/jdb/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.39.3
Git vroot status: weekly.2023.45.1-111-g29eda896
.git/config present: true

CC version: cc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2)
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

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