C error when asserting value from sql db { select from...}

[islonely]

V doctor:

V full version: V 0.4.9 4225a34.b79257b
OS: macos, macOS, 15.1.1, 24B91
Processor: 8 cpus, 64bit, little endian, Apple M3

getwd: /Users/adamoates/.vmodules/islonely/hex
vexe: /Users/adamoates/v/v
vexe mtime: 2025-01-02 15:24:10

vroot: OK, value: /Users/adamoates/v
VMODULES: OK, value: /Users/adamoates/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.39.5 (Apple Git-154)
Git vroot status: weekly.2024.53-14-gb79257b7
.git/config present: true

CC version: Apple clang version 16.0.0 (clang-1600.0.26.4)
emcc version: N/A
thirdparty/tcc status: thirdparty-macos-arm64 713692d4

What did you do?
./v -g -o vdbg cmd/v && ./vdbg /Users/adamoates/Documents/test.v && /Users/adamoates/Documents/test

import db.sqlite

struct Parent {
	id       int     @[primary; sql: serial]
	children []Child @[fkey: 'parent_id']
}

struct Child {
	id        int @[primary; sql: serial]
	parent_id int
}

fn main() {
	mut db := sqlite.connect(':memory:')!
	parent := Parent{
		children: [Child{}, Child{}]
	}
	sql db {
		create table Child
		create table Parent
		insert parent into Parent
	}!

	assert parent.children.len == (sql db {
		select from Parent limit 1
	}!)[0].children.len
}

What did you see?

================== C compilation error (from cc): ==============
cc: /tmp/v_501/test.01JGKTRGKDXEAZ1P41CDN12J0G.tmp.c:10526:108: error: use of undeclared identifier '_t25'
cc:  10526 |                 v_assert_meta_info__t23.rvalue = string_clone(int_str((*(main__Parent*)array_get(( *(Array_main__Parent*)_t25.data), 0)).children.len));
cc:        |                                                                                                                          ^
cc: 1 error generated.
================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

What did you expect to see?

Expected code to compile and the assert to be reached as true.

_{Huly®: V_0.6-21776}

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