builder error: using generics

[enghitalo]

Describe the bug

encode(val.$method()) // Problem here !!!!!!!!!!!!!!!!!!!!!!!!!!!!!1!!!!11!

Reproduction Steps

struct Human {
	name string
}

enum Animal {
	dog
	cat
}

type Entity = Animal | Human

@[sumtype_to: Animal]
fn (ent Entity) json_cast_to_animal() Animal {
	return ent as Animal
}

@[sumtype_to: Human]
fn (ent Entity) json_cast_to_human() Human {
	return ent as Human
}

fn encode[T](val T) {
	$if T is $sumtype {
		$for method in T.methods {
			if method.attrs.len >= 1 {
				if method.attrs[0].contains('sumtype_to') {
					if val.type_name() == method.attrs[0].all_after('sumtype_to:').trim_space() {
						println(val.$method())
						encode(val.$method()) // Problem here !!!!!!!!!!!!!!!!!!!!!!!!!!!!!1!!!!11!
					}
				}
			}
		}
	} $else {
		// error('cannot encode value with ${typeof(val).name} type')
	}
}

encode(Entity(Human{'Monke'}))
encode(Entity(Animal.cat))

Expected Behavior

Human{
    name: 'Monke'
}
cat

Current Behavior

==================
/tmp/v_1000/copy.8521023635428838776.tmp.c:15353: error: cannot convert 'enum <anonymous>' to 'struct string'
...
==================
(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

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.3 be51143

Environment details (OS name and version, etc.)

Linux Ubuntu

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