c compiler error on interface method with type alias

[daansystems]

I think this is related to the fix in #22320
It seems to cause a new issue:

V doctor:

V full version: V 0.4.7 18eee34.c7bdc0a
OS: windows, Microsoft Windows 11 Pro v22631 64-bit
Processor: 24 cpus, 64bit, little endian, 

getwd: D:\vbug
vexe: C:\v\v.exe
vexe mtime: 2024-09-27 05:14:05

vroot: OK, value: C:\v
VMODULES: OK, value: C:\Users\info\.vmodules
VTMP: OK, value: C:\Users\info\AppData\Local\Temp\v_0

Git version: git version 2.42.0.windows.2
Git vroot status: weekly.2024.39-29-gc7bdc0a7-dirty
.git/config present: true

CC version: Error: 'cc' is not recognized as an internal or external command,

operable program or batch file.


thirdparty/tcc status: thirdparty-windows-amd64 b425ac82

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

module main

pub type Mat4 = [16]f32

pub fn (a Mat4) * (b Mat4) Mat4 {
	mut res := Mat4{}
	for i := 0; i < 4; i++ {
		for j := 0; j < 4; j++ {
			res[j * 4 + i] = 0
			for k := 0; k < 4; k++ {
				res[j * 4 + i] += a[k * 4 + i] * b[j * 4 + k]
			}
		}
	}
	return res
}

interface IGameObject {
	world_transform() Mat4
	parent	?&IGameObject
	transform Mat4
}

struct GameObject implements IGameObject {
mut:
	transform Mat4
	parent    ?&IGameObject
}

fn (gameobject GameObject) world_transform() Mat4 {
	if mut p := gameobject.parent {
		return p.world_transform() * gameobject.transform
	}
	return gameobject.transform
}

fn main() {}

What did you expect to see?

no c compiler error

What did you see instead?

================== C compilation error (from tcc): ==============
cc: C:/Users/info/AppData/Local/Temp/v_0/main.01J8RZD1SRCTWSMV5JBM3H1DCN.tmp.c:7097: warning: implicit declaration of function 'tcc_backtrace'
cc: C:/Users/info/AppData/Local/Temp/v_0/main.01J8RZD1SRCTWSMV5JBM3H1DCN.tmp.c:13583: error: cannot convert 'struct _v_Array_fixed_f32_16' to 'float *'
... (the original output was 3 lines long, and was truncated to 2 lines)
=================================================================
(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 .

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[esquerbatua]

Seems that #22320 it's an improve but not fixes that:

/tmp/v_1000/break.tmp.c:13441: error: cannot convert 'struct _v_Array_fixed_f32_16' to 'float *'
builder error: 
==================
C error found. It should never happen, when compiling pure V code.