7ca47aad7d
This PR adds `at` location syntax to the `cbv` tactic, matching the interface of `simp at`. Previously `cbv` could only reduce the goal target; now it supports `cbv at h`, `cbv at h |-`, and `cbv at *`. `cbvGoal` is rewritten to use `Sym.preprocessMVar` followed by `cbvCore` within a single `SymM` context, sharing the term table across all hypotheses and the target. The old `cbvGoalCore` (which reduced one side of an equation goal at a time) is replaced by a general approach that reduces arbitrary goal types and hypothesis types, with special handling for `True` targets and `False` hypotheses. `cbvDecideGoal` is updated to use the extracted `cbvCore` as well. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
21 lines
343 B
Text
21 lines
343 B
Text
set_option cbv.warning false
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def f (n : Nat) : Nat := match n with
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| 0 => 0
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| (n + 1) => (f n) + 1
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termination_by n
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example : f 1 = f 1 := by cbv
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/--
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trace: ⊢ False
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---
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warning: declaration uses `sorry`
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-/
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#guard_msgs in
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example : f 1 = f 2 := by
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cbv
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trace_state
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sorry
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example : "hello" ++ " " ++ "world" = "hello world" := by cbv
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