USE BOOK TYPES AND PROGRAMMING LANGUAGES AS REFERENCE
What are the roles of pickfreshname operation and the condition
ctxlength ctx = n of the printing routine printtm?
Use Book Types And Programming Languages As Reference What Are The Roles Of Pickfreshname Operation And The Condition Ct 1 (55.5 KiB) Viewed 55 times
7.2 Shifting and Substitution 85 = The printing routine itself looks like this: let rec printtm ctx t = match t with TmAbs (fi,x,t1) let (ctx',x'). pickfreshname ctx x in pr "(lambda "; pr x'; pr "."; printtm ctx' t1; pr ")" | TmApp(fi, ti, t2) pr "("; printtm ctx tl; pr ; printtm ctx t2; pr ")" | TmVar(fi,x,n) if ctxlength ctx = n then pr (index2name fi ctx x) else pr "[bad index]" 1
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