cgen failure for an empty $for f in Struct.fields {, when Struct contains fields with a fixed array type

[spytheman]

V doctor:

V full version: V 0.4.3 00f2e4a.b8d1298
OS: linux, Ubuntu 20.04.6 LTS
Processor: 4 cpus, 64bit, little endian, Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz

getwd: /space/v/vnew
vexe: /space/v/vnew/v
vexe mtime: 2023-11-15 08:22:31

vroot: OK, value: /space/v/vnew
VMODULES: OK, value: /home/delian/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.42.0
Git vroot status: weekly.2023.45.1-36-gb8d12985-dirty
.git/config present: true

CC version: cc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

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

struct Another {
	a [3]int
	b [4]u8
	c []int
}

fn test_comptime_types_for_fields_of_another() {
	$for f in Another.fields {
	}
}

What did you expect to see?

a compiled program

What did you see instead?

y.v:8:7: warning: unused variable: `f`
    6 | 
    7 | fn test_comptime_types_for_fields_of_another() {
    8 |     $for f in Another.fields {
      |          ^
    9 |     }
   10 | }
==================
/tmp/v_1000/y.5788582281899540823.tmp.c:1867: warning: type defaults to int
/tmp/v_1000/y.5788582281899540823.tmp.c:1867: error: ';' expected (got "_v_dump_expr_Array_fixed_int_3")
...
==================
(Use `v -cg` to print the entire error message)

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[spytheman]

After some investigation, this compiles:

struct Another {
    a [3]int
    b [4]u8
    c [2]u32
}

// if I comment any of these functions, there is a cgen error too:
fn fa() [3]int { return [1,2,3]! }
fn fb() [4]u8 { return [u8(1),2,3,4]! }
fn fc() [2]u32 { return [u32(1),2]! }

fn test_comptime_types_for_fields_of_another() {
    $for f in Another.fields {
    }
}

Removing one of the functions with a fixed array return type, also triggers a cgen error.
It seems that Gen.write_array_fixed_return_types is not called, when it should, or that the dump auto generator is called when it should not.