generic methods of the embedded interface causes C error

[shove70]

Describe the bug

interface IFoo[T] {
	method (arg T) T
}

interface IBar[T] {
	IFoo[T]
}

struct Derived[T] {
}

fn (d Derived[T]) method[T](arg T) T {
	return arg
}

fn main() {
	a := IBar[int](Derived[int]{})
	_ = a.method(1)
}

Reproduction Steps

/tmp/v_501/a.11806080477544437815.tmp.c:12682:2: error: call to undeclared function 'main__IBar_T_int_method'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        main__IBar_T_int_method(a, 1);
        ^
1 error generated.
...
==================
(Use `v -cg` to print the entire error message)

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

Expected Behavior

no errors.

Current Behavior

C error.

Possible Solution

No response

Additional Information/Context

No response

V version

master

Environment details (OS name and version, etc.)

all

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