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Note in HOWITWORKS about `opaque-placeholder`.

fruit
Tony Garnock-Jones 4 years ago
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636ca9acf7
  1. 4
      syndicate/HOWITWORKS.md

4
syndicate/HOWITWORKS.md

@ -543,6 +543,10 @@ interested in the `present` constructor. @@ -543,6 +543,10 @@ interested in the `present` constructor.
trigger its "matching" inner endpoint, but not the inner
endpoint of the other endpoint, even though you might expect the
relayed assertion to do so.
- There's also a need for `(opaque-placeholder)`s to frustrate
constant-matching against literal `(discard)` in cases of
visibility restriction. See commit b4f1d36 and test case
`test/core/nesting-confusion-2.rkt`.
- there's more to say about the implementation of the *dataspace*
itself, not just the index structures. For example, the care that

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