{
  "$comment": "Every error code the aontu engine can raise, with the class that decides what to do about it. Message text is deliberately absent: the engines are its catalogue.",
  "source": "https://github.com/aontu-lang/aontu/blob/main/test/spec/errcodes.tsv",
  "documented_engine": "0.73.0",
  "lookup": "Match exactly first. A code marked family is never emitted verbatim: the engine appends a name or value (func:upper, ref[$.x]), so fall back to the longest matching family prefix.",
  "classes": {
    "parse": {
      "meaning": "the text is not a document",
      "action": "fix the syntax at the site the frame points at"
    },
    "conflict": {
      "meaning": "two values cannot both hold",
      "action": "one of them is wrong: `aontu model why <path>` names both and where they were written"
    },
    "incomplete": {
      "meaning": "nothing contradicts, but the value is not concrete",
      "action": "supply what is missing, or accept it with `--partial`"
    },
    "reference": {
      "meaning": "a path names nothing",
      "action": "check the spelling; `aontu model get $ --keys` lists what is there"
    },
    "compat": {
      "meaning": "a change breaks an earlier version",
      "action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it"
    },
    "budget": {
      "meaning": "evaluation hit a deterministic limit",
      "action": "usually a cycle; simplify, or raise the budget deliberately"
    },
    "internal": {
      "meaning": "the engine surprised itself",
      "action": "a bug worth reporting"
    }
  },
  "count": 172,
  "codes": [
    {
      "code": "abnf_grammar",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.63.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/abnf_grammar"
    },
    {
      "code": "aggregate_data",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/aggregate_data"
    },
    {
      "code": "aggregate_empty",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/aggregate_empty"
    },
    {
      "code": "alias_budget",
      "class": "budget",
      "class_meaning": "evaluation hit a deterministic limit",
      "class_action": "usually a cycle; simplify, or raise the budget deliberately",
      "since": "0.69.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/alias_budget"
    },
    {
      "code": "alias_colon",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.58.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/alias_colon"
    },
    {
      "code": "alias_in_path",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/alias_in_path"
    },
    {
      "code": "alias_not_toplevel",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/alias_not_toplevel"
    },
    {
      "code": "arg",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/arg"
    },
    {
      "code": "bare_punct",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.58.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/bare_punct"
    },
    {
      "code": "budget_passes",
      "class": "budget",
      "class_meaning": "evaluation hit a deterministic limit",
      "class_action": "usually a cycle; simplify, or raise the budget deliberately",
      "since": "0.52.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/budget_passes"
    },
    {
      "code": "close",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/close"
    },
    {
      "code": "closed",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/closed"
    },
    {
      "code": "compat_default_changed",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/compat_default_changed"
    },
    {
      "code": "compat_marks_changed",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/compat_marks_changed"
    },
    {
      "code": "compat_narrowed",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/compat_narrowed"
    },
    {
      "code": "compat_outcome_changed",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.65.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/compat_outcome_changed"
    },
    {
      "code": "compat_required_added",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/compat_required_added"
    },
    {
      "code": "compat_undetermined",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.65.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/compat_undetermined"
    },
    {
      "code": "conjunct",
      "class": "incomplete",
      "class_meaning": "nothing contradicts, but the value is not concrete",
      "class_action": "supply what is missing, or accept it with `--partial`",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/conjunct"
    },
    {
      "code": "constraint",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.52.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/constraint"
    },
    {
      "code": "constraint_pattern",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/constraint_pattern"
    },
    {
      "code": "decimal_budget",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/decimal_budget"
    },
    {
      "code": "decimal_syntax",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/decimal_syntax"
    },
    {
      "code": "deprecated",
      "class": "compat",
      "class_meaning": "a change breaks an earlier version",
      "class_action": "that is `aontu subsume` / `aontu breaking` talking: widen the change or version it",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/deprecated"
    },
    {
      "code": "disjunct_no_gen",
      "class": "incomplete",
      "class_meaning": "nothing contradicts, but the value is not concrete",
      "class_action": "supply what is missing, or accept it with `--partial`",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/disjunct_no_gen"
    },
    {
      "code": "divide_by_zero",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/divide_by_zero"
    },
    {
      "code": "each_data",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/each_data"
    },
    {
      "code": "elided_value",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/elided_value"
    },
    {
      "code": "emit_body",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/emit_body"
    },
    {
      "code": "emit_data",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/emit_data"
    },
    {
      "code": "emit_none",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/emit_none"
    },
    {
      "code": "emit_ref",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/emit_ref"
    },
    {
      "code": "emit_table",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/emit_table"
    },
    {
      "code": "emit_template",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/emit_template"
    },
    {
      "code": "empty",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.54.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/empty"
    },
    {
      "code": "empty-dist",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.54.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/empty-dist"
    },
    {
      "code": "esc_variant",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.57.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/esc_variant"
    },
    {
      "code": "exact_float_mix",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/exact_float_mix"
    },
    {
      "code": "export_arg",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.69.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/export_arg"
    },
    {
      "code": "filter_data",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/filter_data"
    },
    {
      "code": "float_overflow",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/float_overflow"
    },
    {
      "code": "form_data",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.58.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/form_data"
    },
    {
      "code": "format_check",
      "class": "internal",
      "class_meaning": "the engine surprised itself",
      "class_action": "a bug worth reporting",
      "since": "0.56.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/format_check"
    },
    {
      "code": "func",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/func"
    },
    {
      "code": "func_arg",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.55.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/func_arg"
    },
    {
      "code": "func_arity",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/func_arity"
    },
    {
      "code": "func:",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": true,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/func~3a"
    },
    {
      "code": "import_not_exported",
      "class": "reference",
      "class_meaning": "a path names nothing",
      "class_action": "check the spelling; `aontu model get $ --keys` lists what is there",
      "since": "0.69.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/import_not_exported"
    },
    {
      "code": "include_denied",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/include_denied"
    },
    {
      "code": "include_extension",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.54.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/include_extension"
    },
    {
      "code": "incomplete_expression",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/incomplete_expression"
    },
    {
      "code": "inexact_divide",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/inexact_divide"
    },
    {
      "code": "inexact_integer_sum",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/inexact_integer_sum"
    },
    {
      "code": "internal",
      "class": "internal",
      "class_meaning": "the engine surprised itself",
      "class_action": "a bug worth reporting",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/internal"
    },
    {
      "code": "invalid_var_kind",
      "class": "reference",
      "class_meaning": "a path names nothing",
      "class_action": "check the spelling; `aontu model get $ --keys` lists what is there",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/invalid_var_kind"
    },
    {
      "code": "invalid-arg",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/invalid-arg"
    },
    {
      "code": "inverse_name",
      "class": "parse",
      "class_meaning": "the text is not a document",
      "class_action": "fix the syntax at the site the frame points at",
      "since": "0.53.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/inverse_name"
    },
    {
      "code": "join_member",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.54.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/join_member"
    },
    {
      "code": "key_level",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/key_level"
    },
    {
      "code": "list",
      "class": "conflict",
      "class_meaning": "two values cannot both hold",
      "class_action": "one of them is wrong: `aontu model why <path>` names both and where they were written",
      "since": "0.51.0",
      "family": false,
      "ahead_of_documented_engine": false,
      "url": "https://aontu.dev/errors/list"
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