189f5d41fb
This PR introduces a new feature that allows users to specify which inductive datatypes the `grind` tactic should perform case splits on. The configuration option `splitIndPred` is now set to `false` by default. The attribute `[grind cases]` is used to mark inductive datatypes and predicates that `grind` may case split on during the search. Additionally, the attribute `[grind cases eager]` can be used to mark datatypes and predicates for case splitting both during pre-processing and the search. Users can also write `grind [HasType]` or `grind [cases HasType]` to instruct `grind` to perform case splitting on the inductive predicate `HasType` in a specific instance. Similarly, `grind [-Or]` can be used to instruct `grind` not to case split on disjunctions. Co-authored-by: Leonardo de Moura <leodemoura@amazon.com>
50 lines
953 B
Text
50 lines
953 B
Text
variable (d : Nat) in
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inductive X : Nat → Prop
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| f {s : Nat} : X s
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| g {s : Nat} : X d → X s
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/--
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error: `grind` failed
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case grind.1
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c : Nat
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q : X c 0
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s : Nat
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h✝ : 0 = s
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h : HEq ⋯ ⋯
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⊢ False
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[grind] Diagnostics
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[facts] Asserted facts
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[prop] X c 0
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[prop] 0 = s
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[prop] HEq ⋯ ⋯
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[eqc] True propositions
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[prop] X c 0
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[prop] X c s
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[eqc] Equivalence classes
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[eqc] {s, 0}
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case grind.2
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c : Nat
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q : X c 0
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s : Nat
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a✝¹ a✝ : X c c
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h✝ : 0 = s
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h : HEq ⋯ ⋯
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⊢ False
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[grind] Diagnostics
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[facts] Asserted facts
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[prop] X c 0
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[prop] X c c
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[prop] 0 = s
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[prop] HEq ⋯ ⋯
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[eqc] True propositions
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[prop] X c 0
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[prop] X c c
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[prop] X c s
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[eqc] Equivalence classes
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[eqc] {s, 0}
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[issues] Issues
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[issue] this goal was not fully processed due to previous failures, threshold: `(failures := 1)`
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-/
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#guard_msgs (error) in
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example {c : Nat} (q : X c 0) : False := by
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grind [X]
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