[plt-scheme] Reading structs from a file

Tried to read a posn that I had written to a file

 

with

 

(with-input-from-file "posn.txt" (lambda () (posn-x (read))))

 

Got posn-x: expects argument of type <struct:posn>; given #(struct:posn 3 4)

 

Btw I thought with-input-from-file was supposed to be part of ASL?

 

PS I can read lists from file no problem.
 		 	   		  
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