Generic function fails to be created on second use of generic function

[jcweaver997]

Describe the bug

There is a bug with the generics where it will not produce the generic function for the second use of the generic function. In this case, func2[Struct1] is generated, but func2[Struct2] is not, causing a compilation error

Reproduction Steps

The following code will produce the issue

module main

struct ClassInfo {
	func fn () = unsafe { nil }
}

pub fn func2[T]() {
}

pub fn func1[T]() {
	ci := ClassInfo{
		func: func2[T]
	}
	ci.func()
}

struct Struct1 {}

struct Struct2 {}

pub fn main() {
	func1[Struct1]()
	func1[Struct2]()
}

Expected Behavior

successful compile

Current Behavior

Fails to compile with the following error

PS C:\Users\jcwea\Documents\git\vtest> v -cg run .    
C:/Users/jcwea/AppData/Local/Temp/v_0/vtest.01HPSP98VD487P3GG4CG3VMKQV.tmp.c:497: warning: WINVER redefined
C:/Users/jcwea/AppData/Local/Temp/v_0/vtest.01HPSP98VD487P3GG4CG3VMKQV.tmp.c:6880: warning: implicit declaration of function 'tcc_backtrace'
C:/Users/jcwea/AppData/Local/Temp/v_0/vtest.01HPSP98VD487P3GG4CG3VMKQV.tmp.c:13104: error: 'main__func2_T_main__Struct2' undeclared
builder error:
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.4 1d3147e

Environment details (OS name and version, etc.)

V full version: V 0.4.4 afd74ad.1d3147e
OS: windows, Microsoft Windows 11 Pro v26058 64-bit
Processor: 24 cpus, 64bit, little endian, 

getwd: C:\Users\jcwea\Documents\git\vtest
vexe: C:\Users\jcwea\Documents\git\v\v.exe
vexe mtime: 2024-02-16 19:26:43

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

Git version: git version 2.40.0.windows.1
Git vroot status: weekly.2024.06-86-g1d3147e1
.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 b99a453d

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[jcweaver997]

This one has a workaround, just create a local variable with the function

module main

struct ClassInfo {
	func fn () = unsafe { nil }
}

pub fn func2[T]() {
}

pub fn func1[T]() {
	f := func2[T]
	ci := ClassInfo{
		func: f
	}
	ci.func()
}

struct Struct1 {}

struct Struct2 {}

pub fn main() {
	func1[Struct1]()
	func1[Struct2]()
}