extra code in generated C code

[kbkpbot]

Describe the bug

Because markused is not work as expected, there are some extra code in final generated C code.

It may related to bug found at #25997 (comment)_

Reproduction Steps

g.v

module main

fn new[T]() map[u8]T {
        x := map[u8]T{}
        return x
}

fn not_used_fn() map[u8]int {
        x := new[int]()
        return x
}

fn main() {
        x := new[u32]()
        dump(x)
}

Expected Behavior

final C code should contain only following code:

VV_LOC Map_u8_u32 main__new_T_u32(void) {
        Map_u8_u32 x = builtin__new_map_noscan_key_value(sizeof(u8), sizeof(u32), &builtin__map_hash_int_1, &builtin__map_eq_int_1, &builtin__map_clone_int_1, &builtin__map_free_nop)
        ;
        return x;
}
VV_LOC void main__main(void) {
        Map_u8_u32 x = main__new_T_u32();
         _v_dump_expr_Map_u8_u32(_S("g.v"), 15, _S("x"), x);
}

Current Behavior

extra code exist in C code:

VV_LOC Map_u8_int main__new_T_int(void) {   // this should not exist in final C code!
        Map_u8_int x = builtin__new_map_noscan_key_value(sizeof(u8), sizeof(int), &builtin__map_hash_int_1, &builtin__map_eq_int_1, &builtin__map_clone_int_1, &builtin__map_free_nop)
        ;
        return x;
}
VV_LOC Map_u8_u32 main__new_T_u32(void) {
        Map_u8_u32 x = builtin__new_map_noscan_key_value(sizeof(u8), sizeof(u32), &builtin__map_hash_int_1, &builtin__map_eq_int_1, &builtin__map_clone_int_1, &builtin__map_free_nop)
        ;
        return x;
}
VV_LOC void main__main(void) {
        Map_u8_u32 x = main__new_T_u32();
         _v_dump_expr_Map_u8_u32(_S("g.v"), 15, _S("x"), x);
}

Possible Solution

One option: reset all concrete_types to empty before enter markused, then use markused add all used concrete_types back.

Additional Information/Context

No response

V version

V 0.4.12 967a4a2

Environment details (OS name and version, etc.)

V full version	V 0.4.12 967a4a2
OS	linux, Ubuntu 24.04.3 LTS
Processor	8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
Memory	10.91GB/15.51GB
V executable	/media/HD/github/kbkpbot/v/v
V last modified time	2025-12-18 12:58:41
V home dir	OK, value: /media/HD/github/kbkpbot/v
VMODULES	OK, value: /home/mars/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/mars
Git version	git version 2.43.0
V git status	weekly.2025.46-227-g636527a4-dirty
.git/config present	true
cc version	cc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
gcc version	gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
clang version	Ubuntu clang version 18.1.3 (1ubuntu1)
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 2.39-0ubuntu8.6) 2.39

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.

[felipensp]

It works as expected, it was planned to do a simple cleanup at the moment.