interface variable breaks -autofree

[Checkmate6659]

V doctor:

V full version: V 0.4.7 f879368.3965a6c
OS: linux, Ubuntu 20.04.6 LTS
Processor: 8 cpus, 64bit, little endian, AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx

getwd: /home/enigma/vlang/bober_mini
vexe: /home/enigma/vlang/v/v
vexe mtime: 2024-08-18 18:33:11

vroot: OK, value: /home/enigma/vlang/v
VMODULES: OK, value: /home/enigma/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.25.1
Git vroot status: weekly.2024.33-26-g3965a6c5
.git/config present: true

CC version: cc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

What did you do?
./v -g -o vdbg cmd/v && ./vdbg src/main.v

module main

import rand
import rand.pcg32

fn main() {
	rng := rand.PRNG(pcg32.PCG32RNG{})
}

What did you expect to see?

When compiled normally, a PRNG gets created and nothing happens. When compiled using -autofree, a C error appears.

What did you see instead?

src/main.v:7:2: warning: unused variable: `rng`
    5 | 
    6 | fn main() {
    7 |     rng := rand.PRNG(pcg32.PCG32RNG{})
      |     ~~~
    8 | }

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