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{
  "commit": "4000cd09f2e29da4ef154392e0499caa5c1347f5",
  "tree": "9fe2a8655a617aafdc790405929585492b089d12",
  "parents": [
    "47888ad0aeb367a7e1a76a88dd8dbeb120e293a6"
  ],
  "author": {
    "name": "reventlov",
    "email": "dmitri+github.com@xn13.com",
    "time": "Tue Apr 05 12:15:39 2022 -0700"
  },
  "committer": {
    "name": "reventlov",
    "email": "dmitri+github.com@xn13.com",
    "time": "Tue Apr 05 12:15:39 2022 -0700"
  },
  "message": "Implement the `$next` keyword for convenient packed structures.\n\nThis change adds a new keyword, `$next`, which may be used in the offset\nexpression of a physical field, and which translates to \"the offset of\nthe first byte after the end of the syntactically previous physical\nfield.\"\n\nEssentially, it allows `struct`s or `bits` like:\n\n    struct Foo:\n      0     [+4]  UInt  a\n      $next [+2]  UInt  b\n      $next [+1]  UInt  c\n      $next [+4]  UInt  d\n\n... where each field is packed directly after the previous one.  See the\nupdated documentation in `doc/language-reference.md` for details.\n\nThis also contains a few incidental changes:\n\n*   A new function in `ir_util`, for scanning subtrees of the IR.  Note\n    that a similar function used to exist; this is really a resurrection\n    of that functionality.\n*   `synthetics.synthesize_fields` has been renamed to\n    `synthetics.desugar`, since it now does more than just synthesize\n    fields.\n*   The \"how to use the Emboss compiler\" sections of `guide.md` have been\n    expanded.\n*   The comment in `compiler/front_end/docs_are_up_to_date_test.py` has\n    been updated with the correct paths for the open-source Emboss.\n",
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