fix heap-use-after-free condition when cancelling spawned task, close… #196
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…boostorg#194 The variable "recs" was allocated on a piece of memory whose lifetime was managed at the level of the coroutine (inside its frame). This led to access to freed memory if that coroutine (its frame) was deleted
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This change corrects the error reported in issue 194. However, I do not have much experience with cobalt interiors, so it is worth having the author take a look at it.