suzanne.soy/delay-pure
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racket/unsafe/undefined should not be allowed #1

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opened 2018-06-03 00:12:43 +01:00 by SuzanneSoy · 0 comments
SuzanneSoy commented 2018-06-03 00:12:43 +01:00 (Migrated from github.com)
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If racket/unsafe/undefined can actually be used for unsoundness, it should not be allowed. Instead, we should use an ad-hoc implementation of optional arguments (have a standard wrapper function with optional arguments using a unique symbol to indicate their absence, and pass those values to the "barrier" which verifies purity, so that # is never used.

If racket/unsafe/undefined can actually be used for unsoundness, it should not be allowed. Instead, we should use an ad-hoc implementation of optional arguments (have a standard wrapper function with optional arguments using a unique symbol to indicate their absence, and pass those values to the "barrier" which verifies purity, so that #<unsafe-undefined> is never used.
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This issue can make the type system unsound

  
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Reference: suzanne.soy/delay-pure#1
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