How can I cast, inspect pointers given back from the view debug hierarchy?

Question

I keep getting errors of

hexadecimal floating literal requires an exponent

or if I try to cast some label pointer, e.g. do:

po 0x7ffded7e7cf0 as UIlabel

I get:

error: expected ';' after expression

error: unknown type name 'as'

I know I can see most of this information on the right panel, but I want to get the information from the console myself (e.g. a label's text).