382b72fd   
   From: ak@akkartik.com   
      
   On Mon, Mar 12, 2018 at 8:09 PM, William Clodius  wrote:   
   > Didn't Lisp have first order functions and closures in 58? If I remember   
   > the discussion of APT in the HOPL I conference proceedings correctly it   
   > surprisingly had the equivalent of structs.   
      
   Lisp had first-class functions but closures require lexical scope,   
   which didn't land until Scheme in the '70s.   
      
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