the derivative function, the nullability check, the rewrite rules - they’re all structural recursion over this type. F#‘s pattern matching makes this natural to write and natural to read. and when you need raw performance in the hot loop, SRTP, inlining, and even raw embedded IL are right there.
Anyone who finds a dead wild bird is urged not to touch it and to report the sighting to Defra (or Dera in Northern Ireland) for possible collection and testing. Sightings should also be logged with BirdTrack, the online reporting scheme run by the British Trust for Ornithology.
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"I compare it to Covid," says Harold Scruby, the chairman of the Pedestrian Council of Australia. "It starts here and if they don't put a stop to it…" he trails off as he contemplates the apparently inexorable spread of teenagers on illegal fatbikes.
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