C error when smart casting interface to type

[lv37]

Describe the bug

Trying to compile

module main

interface Abc {
	a int
}

struct Xyz {
	a int
}

fn main() {
	d := Abc(Xyz{})
	if d is Xyz {
		println(d)
	}
}

gives

/tmp/v_1002/src.6834607243794453707.tmp.c:12663: error: cannot convert 'struct main__Xyz' to 'void *'

Reproduction Steps

try to compile the above code

Expected Behavior

compile successfully

Current Behavior

/tmp/v_1002/src.6834607243794453707.tmp.c:12663: error: cannot convert 'struct main__Xyz' to 'void *'

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.2 bd52a94

Environment details (OS name and version, etc.)

V full version: V 0.4.2 4bc9a8f.bd52a94
OS: linux, Linux version 6.5.9-200.fc38.x86_64 (mockbuild@1cc7d6d790524511abd343182a21832a) (gcc (GCC) 13.2.1 20231011 (Red Hat 13.2.1-4), GNU ld version 2.39-15.fc38) #1 SMP PREEMPT_DYNAMIC Wed Oct 25 20:40:49 UTC 2023
Processor: 4 cpus, 64bit, little endian, Intel(R) Core(TM) i5-4310U CPU @ 2.00GHz

getwd: /home/user/Projects/v-testing/webview
vexe: /home/user/.local/lib/v/v
vexe mtime: 2023-11-06 17:14:03

vroot: OK, value: /home/user/.local/lib/v
VMODULES: OK, value: /home/user/.vmodules
VTMP: OK, value: /tmp/v_1002

Git version: git version 2.41.0
Git vroot status: weekly.2023.44-67-gbd52a94e
.git/config present: true

CC version: cc (GCC) 13.2.1 20231011 (Red Hat 13.2.1-4)
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

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[shove70]

Wait for the PR of another related problem to merge and then deal with this one