Nested generics compilation error

[get200]

V version: V 0.4.10 2c42574, press to see full `v doctor` output

V full version	V 0.4.10 2c42574
OS	windows, Microsoft Windows 11 专业版 26100 64-bit
Processor	24 cpus, 64bit, little endian, AMD Ryzen 9 5900X 12-Core Processor
Memory	49.28GB/63.91GB
V executable	D:\v\v\v.exe
V last modified time	2025-05-18 14:17:11
V home dir	OK, value: D:\v\v
VMODULES	OK, value: C:\Users\Administrator.vmodules
VTMP	OK, value: C:\Users\Administrator\AppData\Local\Temp\v_0
Current working dir	OK, value: E:\2025\v\v_test
Git version	git version 2.46.0.windows.1
V git status	weekly.2022.48-5439-g2c42574e-dirty
.git/config present	true
cc version	cc (Rev5, Built by MSYS2 project) 13.2.0
gcc version	gcc (Rev5, Built by MSYS2 project) 13.2.0
clang version	clang version 18.1.6
msvc version	N/A
tcc version	tcc version 0.9.27 (x86_64 Windows)
tcc git status	thirdparty-windows-amd64 b425ac82
emcc version	N/A
glibc version	N/A

What did you do?
./v -g -o vdbg cmd/v && ./vdbg nested_gen.v && E:\2025\v\v_test\nested_gen.exe

module main

struct People[T] {
	raw T
}

struct Man {
	name string
}

fn main() {
	// p1 := People{Man{
	// 	name: 'Mike'
	// }}
	m1 := Man{
		name: 'Tom'
	}

	gen1(m1)
}

fn gen1[T](m T) {
	gen2[People[T]]()
}

fn gen2[T]() {
}

What did you see?

================== C compilation error (from tcc): ==============
cc: C:/Users/Administrator/AppData/Local/Temp/v_0/nested_gen.tmp.c:535: warning: WINVER redefined
cc: C:/Users/Administrator/AppData/Local/Temp/v_0/nested_gen.tmp.c:1436: error: constant expression expected
=================================================================
(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 .

1434 VV_LOCAL_SYMBOL void main__main(void);
1435 VV_LOCAL_SYMBOL void main__gen1_T_main__Man(main__Man m);
1436 VV_LOCAL_SYMBOL void main__gen2_T_main__People[main__Man](void);

What did you expect to see?
Compiled successfully

Compiles successfully if the following section is commented out.

module main

struct People[T] {
	raw T
}

struct Man {
	name string
}

fn main() {
	p1 := People{Man{
	 	name: 'Mike'
	 }}
	m1 := Man{
		name: 'Tom'
	}

	gen1(m1)
}

fn gen1[T](m T) {
	gen2[People[T]]()
}

fn gen2[T]() {
}

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.

[huly-for-github]

Connected to Huly®: V_0.6-22898