a0c8404ab8
This PR improves the error message when no library suggestions engine is
registered to recommend importing `Lean.LibrarySuggestions.Default` for
the built-in engine.
**Before:**
```
No library suggestions engine registered. (Note that Lean does not provide a default library suggestions engine, these must be provided by a downstream library, and configured using `set_library_suggestions`.)
```
**After:**
```
No library suggestions engine registered. (Add `import Lean.LibrarySuggestions.Default` to use Lean's built-in engine, or use `set_library_suggestions` to configure a custom one.)
```
🤖 Prepared with Claude Code
Co-authored-by: Claude <noreply@anthropic.com>
101 lines
2.1 KiB
Text
101 lines
2.1 KiB
Text
import Lean.LibrarySuggestions.Basic
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/--
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error: No library suggestions engine registered. (Add `import Lean.LibrarySuggestions.Default` to use Lean's built-in engine, or use `set_library_suggestions` to configure a custom one.)
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-/
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#guard_msgs in
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example : True := by
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grind +suggestions
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set_library_suggestions (fun _ _ => pure #[])
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#guard_msgs in
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example : True := by
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grind +suggestions
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def P (_ : Nat) := True
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theorem p : P 7 := trivial
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/--
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error: `grind` failed
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case grind
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h : ¬P 37
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⊢ False
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[grind] Goal diagnostics
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[facts] Asserted facts
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[prop] ¬P 37
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[eqc] False propositions
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[prop] P 37
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-/
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#guard_msgs in
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example : P 37 := by
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grind
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example : P 7 := by
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grind [p]
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set_library_suggestions (fun _ _ => pure #[{ name := `p, score := 1.0 }])
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/--
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info: Library suggestions:
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p
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-/
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#guard_msgs in
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example : P 7 := by
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suggestions
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grind +suggestions
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set_library_suggestions (fun _ _ => pure #[{ name := `p, score := 0.5 }])
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/--
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info: Library suggestions:
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p (score: 0.500000)
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-/
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#guard_msgs in
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example : P 7 := by
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suggestions
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grind +suggestions
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set_library_suggestions (fun _ _ => pure #[{ name := `p, score := 1.0, flag := some "←" }])
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/--
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info: Library suggestions:
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p [←]
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---
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error: unexpected modifier ←
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-/
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#guard_msgs in
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example : P 7 := by
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suggestions
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grind +suggestions
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set_library_suggestions (fun _ _ => pure #[
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{ name := `p, score := 0.9 },
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{ name := `f, score := 0.7 }
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])
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/--
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info: Library suggestions:
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p (score: 0.900000)
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f (score: 0.700000)
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-/
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#guard_msgs in
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example : P 7 := by
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suggestions
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grind [p]
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set_library_suggestions (fun _ _ => pure #[{ name := `List.append_assoc, score := 1.0 }])
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-- Make sure there is no warning about the redundant theorem.
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#guard_msgs in
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example (x y z : List Nat) : x ++ (y ++ z) = (x ++ y) ++ z := by
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grind +suggestions
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theorem f : True := trivial
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set_library_suggestions (fun _ _ => pure #[{ name := `f, score := 1.0 }])
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-- Make sure that bad suggestions (e.g. not patterns) from premise selection are dropped silently.
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#guard_msgs in
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example (x y z : List Nat) : x ++ (y ++ z) = (x ++ y) ++ z := by
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grind +suggestions
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