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[LOGIC-43] LVar should print readably Created: 05/Jul/12  Updated: 05/Jul/12

Status: Open
Project: core.logic
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Enhancement Priority: Minor
Reporter: Alan Malloy Assignee: David Nolen
Resolution: Unresolved Votes: 0
Labels: None

Attachments: Text File 0001-Make-lvar-print-readably.patch    
Patch: Code

 Description   

Currently LVar objects print the same as symbols; they should either print as an unreadable form, or in a way that the reader can read them back in and get an LVar. Attached patch causes them to be read in as LVars.

However, (read-string (pr-str lv)) does not compare as equal to lv, because the implementation of .equals relies on their string :name objects being identical? - which they will not be, if one LVar was created by the lvar function, which uses str, and the other created by read-string, which uses String/intern.

It seems plausible to say that LVars can't be compared for equality after sending them through strings, but that's awkward and unpleasant. We could instead define LVars to compare their names with = rather than with identical?, but David expressed concern about the performance implications of that change.


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