e01cbf2b8f
This PR adds a `result? : Option TraceResult` field to `TraceData` and populates it in `withTraceNode` and `withTraceNodeBefore`, so that metaprograms walking trace trees can determine success/failure structurally instead of string-matching on emoji. `TraceResult` has three cases: `.success` (checkEmoji), `.failure` (crossEmoji), and `.error` (bombEmoji, exception thrown). An `ExceptToTraceResult` typeclass converts `Except` results to `TraceResult` directly, with instances for `Bool` and `Option`. `TraceResult.toEmoji` converts back to emoji for display. This replaces the previous `ExceptToEmoji` typeclass — `TraceResult` is now the primary representation rather than being derived from emoji strings. `withTraceNodeBefore` (used by `isDefEq`) uses `ExceptToTraceResult.toTraceResult` directly, correctly handling `Bool` (`.ok false` = failure) and `Option` (`.ok none` = failure), with `Except.error` mapping to `.error`. For `withTraceNode`, `result?` defaults to `none`. Callers can pass `mkResult?` to provide structured results; when set, the corresponding emoji is auto-prepended to the message. Motivated by mathlib's `#defeq_abuse` diagnostic tactic (https://github.com/leanprover-community/mathlib4/pull/35750) which currently string-matches on emoji to determine trace node outcomes. See https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency 🤖 Prepared with Claude Code --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
127 lines
4.4 KiB
Text
127 lines
4.4 KiB
Text
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"diagnostics":
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"severity": 3,
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"range":
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"message": "(trace)",
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"fullRange":
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{"start": {"line": 19, "character": 0},
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"end": {"line": 19, "character": 5}}}]}
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[{"source": "Lean 4",
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"severity": 3,
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"range":
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{"start": {"line": 19, "character": 0}, "end": {"line": 19, "character": 5}},
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"message":
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{"tag":
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{"tag": [{"expr": {"text": " "}}, {"text": ""}]},
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{"tag": [{"expr": {"text": "root"}}, {"text": ""}]}]},
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{"tag":
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{"text": ""}]}]}}},
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"cls": "Meta.debug",
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{"text": ""}]}]}}},
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{"text": ""}]},
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"fullRange":
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