[go-nuts] How can I read private field in go struct instance

[杜沁园]

I recently write a program to recursively print all fields and value in a 
struct. Interface() is the most convinence way to get underlying value in 
go.
But it will panic when field is private.How can I access private field? 

For simple type, I can stil use Int(),Bool(),etc to read private field.  
 But if the field is a interface, I do not know how to access is concrete 
value without use Interface() method.


For example:

type Expr interface {
   eval(v string) bool
}

type MyExpr struct {
   Haha string
}


type Web struct {
   Host    string
   epr     Expr
}




How can I get Web.Epr Value by reflection without use Interface() method

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