CN: Add the ability to refer to resources by name - #921
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This commit is the first in a series to address rems-project#311, by allowing users to name the (quantified) resource they want to focus on. The precise syntax will probably change in response to user feedback, but right now it is `take <sym> = <resource> as <sym'>;` where "as" is a new keyword and "<sym'>" is a symbol. At this point, the latter part is optional, to preserve backwards compatibility. Only quantified predicates really _need_ names, but to forbid names on regular resources grammatically seems overly restrictive, so we shall see how that plays out. A tentative plan for how names evolve is: |--------------------------|-----------| | Owned<struct s>(..) as H | H.<field> | | Owned<ct[10]> as H | H[<index> | | focus H[<var>]; | H[<var>] | | focus H[<expr>] as H' | H' | | partial consumption | H | | unfold a user-def pred | H.<names> | Also need a way of naming the ensures of a function call. I believe there is no need to consider generating names for predicate folds because that will only happen on demand at an ensures or preceding a function call. Perhaps the "names" of the resources in the context actually need to be terms, e.g. to deal smoothly with H[<expr>].
This commit adds support in the parser and Cabs to having a single magic comment at the end of an call expression. It still needs to be pretty-printed as well as translated into correct/useful Ail.
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Better to split into separate PRs:
Given that there are already usable symbols for this, will be easier to try a |
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To fix #311. Experimental.