Implementing exhaleExt for quantified permissions#589
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July 12, 2026 21:12
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Carbon currently crashes when having to exhale a QP during a package operation, so when there is a QP on the right hand side of a wand or when one is asserted inside a
packagestatement.This is due to a missing implementation of
exhaleExt, which exhales permissions from a stack of heaps instead of a single one. This PR adds this implementation, which closely follows the one for the existing implementation for individual permissions (for example, there is now a methodtransferMainQuantwith a similar structure as the existingtransferMainmethod etc.)Instead of a single variable tracking how many permissions are left to be exhaled, we track an entire mask that contains all permissions that are left to be exhaled.
Like the existing
exhaleExtimplementation for non-quantified permissions, wildcards are currently not supported (and Carbon fails in the same way).