unityscript and c# inheritance problem, how to access sub class's functio?

Unity Engine
1 
public class Test : MonoBehaviour {


	// Use this for initialization 
	void Start () {
		a1 ins = new a1();
		a1.G();
	}
}


class a1{
	public void F(){
		Debug.Log("a1.F");
	}
}


class a2 : a1{
	public void G(){
		Debug.Log("a2.G");
	}
}

So I wrote like above in unityscript and it worked for PC platform (Dynamic compile possible),

but I need to convert that for android, ios, so should change to Strict compile (#pragma strict),

result error says -
a1' does not contain a definition for G’

Then how to revise this?

Below is part of my script of unityscript version. (Has compile error for mobile game)

class CharactersCard{		// for all character's general
	var skillType : cardSkillTypes; 
}
class GrndMgSkillCard extends CharactersCard{	
	var byDefaultVal : boolean = true; // use default values? 
	var element : elements;
	var fireCrds : fireCards;
	var iceCrds : iceCards;
	var windCrds : windCards;
	var earthCrds : earthCards;
	var otherCrds : otherCards;
	var buffCrds : buffCards;
	var guardCrds : guardCards;
	var myCard : GmCard ;    
}

var auxPlyrCrds : CharactersCard[];

for(var z : int = 0 ; z < auxMxCrds ; z++){	
   if(auxPlyrCrds[z].myCard.guardSkill){
.....
...

error : myCard is not a member of ‘CharactersCard’

2

Hello!

It goes the opposite way. GrndMgSkillCard gets “skillType” from CharactersCard, but CharactersCard does not get “byDefaultVal” or “element” or … from GrndMgSkillCard.

3

Or to say another way, GrndMgSkillCard extends CharactersCard, so it gets everything CharactersCard already had.

A CharactersCard does not get anything from GrndMgSkillCard, unless (aCharactersCard is GrndMgSkillCard == true) in which case you need to cast to GrndMgSkillCard first.

4

but in dynamic circumstances, auxPlyrCrds[×].myCard passed compile step.

problem is, this does not work at for mobile script.

So how to revise this?