bug: C error instead of clean compile or V error

[snakeru]

V version: V 0.4.10 27829d5, press to see full `v doctor` output

V full version	V 0.4.10 27829d56cd897ed1eb25638d0b113320a24e7768.27829d5
OS	linux, Ubuntu 22.04.5 LTS
Processor	16 cpus, 64bit, little endian, 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
Memory	21.87GB/31.13GB
V executable	/home/a/git/v/v
V last modified time	2025-05-11 08:09:22
V home dir	OK, value: /home/a/git/v
VMODULES	OK, value: /home/a/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/a/projects/iverlet
Git version	git version 2.34.1
V git status	weekly.2025.19-14-g27829d56
.git/config present	true
cc version	cc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
gcc version	gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
clang version	N/A
tcc version	tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
tcc git status	thirdparty-linux-amd64 696c1d84
emcc version	N/A
glibc version	ldd (Ubuntu GLIBC 2.35-0ubuntu3.9) 2.35

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

module main

type Aa = [2]struct{}

fn main() {
    a := [2]Aa{}
    _ = a
}

What did you see?

================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/main.01JTZTD4SHHR8VG40GTDZSA62V.tmp.c:1052: error: ';' expected (got "Array_fixed_main__Aa_2")
=================================================================
(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?

I expect this code to compile or at least provide me with a helpful error description. This is the minimal example that throws that error, somewhat more elaborate (that I actually wanted to use) is:

module main
struct Ab {
	data    int
}
type Cd = [2]Ab
type Ef = [2]Cd
fn main() {
	println(1)
}

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[huly-for-github[bot]]

Connected to Huly®: V_0.6-22832

[Delta456]

This needs to be an error as you can't make nested type aliases.

[snakeru]

Ah, a pity that one isn't allowed to nest type aliases. When writing programs I still think in pure Go and then translate it to V to see what breaks. But in Go these are real types, not aliases.

That aside, the code in the very first snippet doesn't use nested aliases but still breaks.

[felipensp]

It should works, once normal array works. []struct{}.