Problem 6 Note that we can actually infer the type of an texpr. If we see (x, IntLit (8)),we know x shoul an Int. So now write a similar function infer which overwrites any incorrect types. val infer: texpr -> texpr Note: • if an empty list is encountered, raise (Failure "empty list") • if a list has inconsistent types, raise (Failure "inconsistent") • list order is preserved
Problem 6 Note that we can actually infer the type of an texpr. If we see (x, IntLit (8)),we know x shoul an Int. So now write a similar function infer which overwrites any incorrect types. val infer: texpr -> texpr Note: • if an empty list is encountered, raise (Failure "empty list") • if a list has inconsistent types, raise (Failure "inconsistent") • list order is preserved
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![Problem 6
Note that we can actually infer the type of an texpr. If we see (x, IntLit (8)),we know x should be
an Int. So now write a similar function infer which overwrites any incorrect types.
val infer: texpr -> texpr
Note:
• if an empty list is encountered, raise (Failure "empty list")
• if a list has inconsistent types, raise (Failure "inconsistent")
• list order is preserved
negExample from Problem 5 should be inconsistent.
let infExample =
(List Int,
Seq
[ (Int, Seq [(Bool, BoolLit false); (Bool, Boollit true)]);
(Bool, Seq [(Int, Boollit true)]) ])
in
infer infExample
evaluates to
(List (List Bool),
Seq
[ (List Bool, Seq [(Bool, Boollit false); (Bool, Boollit true)]);
(List Bool, Seq [(Bool, Boollit true)]) ])](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F16eacc05-7dd3-4fb8-b350-d200f81ad4fd%2F0059926d-862f-49a5-90b2-782aca2668fd%2Fl8bxyzg_processed.png&w=3840&q=75)
Transcribed Image Text:Problem 6
Note that we can actually infer the type of an texpr. If we see (x, IntLit (8)),we know x should be
an Int. So now write a similar function infer which overwrites any incorrect types.
val infer: texpr -> texpr
Note:
• if an empty list is encountered, raise (Failure "empty list")
• if a list has inconsistent types, raise (Failure "inconsistent")
• list order is preserved
negExample from Problem 5 should be inconsistent.
let infExample =
(List Int,
Seq
[ (Int, Seq [(Bool, BoolLit false); (Bool, Boollit true)]);
(Bool, Seq [(Int, Boollit true)]) ])
in
infer infExample
evaluates to
(List (List Bool),
Seq
[ (List Bool, Seq [(Bool, Boollit false); (Bool, Boollit true)]);
(List Bool, Seq [(Bool, Boollit true)]) ])
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