# class KeyError

Raised when the specified key is not found. It is a subclass of IndexError.

    h = {"foo" => :bar}
    h.fetch("foo") #=> :bar
    h.fetch("baz") #=> KeyError: key not found: "baz"

### Public Instance Methods

key → object click to toggle source

Return the key caused this KeyError exception.

    static VALUE
    key_err_key(VALUE self)
    {
        VALUE key;

        key = rb_ivar_lookup(self, id_key, Qundef);
        if (key != Qundef) return key;
        rb_raise(rb_eArgError, "no key is available");
    }

receiver → object click to toggle source

Return the receiver associated with this KeyError exception.

    static VALUE
    key_err_receiver(VALUE self)
    {
        VALUE recv;

        recv = rb_ivar_lookup(self, id_receiver, Qundef);
        if (recv != Qundef) return recv;
        rb_raise(rb_eArgError, "no receiver is available");
    }