diff options
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/lean/Base/Arith/Int.lean | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/backends/lean/Base/Arith/Int.lean b/backends/lean/Base/Arith/Int.lean index ab6dd4ab..068d6f2f 100644 --- a/backends/lean/Base/Arith/Int.lean +++ b/backends/lean/Base/Arith/Int.lean @@ -112,9 +112,10 @@ def collectInstancesFromMainCtx (k : Expr → MetaM (Option Expr)) : Tactic.Tact -- Explore the declarations let decls ← ctx.getDecls let hs ← decls.foldlM (fun hs d => do - -- Collect instances over all subexpressions - -- of the inferred type rather than the declaration expression - -- which is often just a name. + -- Collect instances over all subexpressions in the context. + -- Note that we explore the *type* of the local declarations: if we have + -- for instance `h : A ∧ B` in the context, the expression itself is simply + -- `h`; the information we are interested in is its type. let ty ← Lean.Meta.inferType d.toExpr collectInstances k hs ty ) hs @@ -122,26 +123,27 @@ def collectInstancesFromMainCtx (k : Expr → MetaM (Option Expr)) : Tactic.Tact collectInstances k hs (← Tactic.getMainTarget) -- Helper -def lookupProp (fName : String) (className : Name) (e : Expr) (instantiateClassFn : Expr → Expr → Array Expr) (instantiateProjectionFn : Expr → Array Expr) : MetaM (Option Expr) := do +def lookupProp (fName : String) (className : Name) (e : Expr) + (instantiateClassFn : Expr → MetaM (Array Expr)) + (instantiateProjectionFn : Expr → MetaM (Array Expr)) : MetaM (Option Expr) := do trace[Arith] fName -- TODO: do we need Lean.observing? -- This actually eliminates the error messages trace[Arith] m!"{fName}: {e}" Lean.observing? do trace[Arith] m!"{fName}: observing: {e}" - let ty ← Lean.Meta.inferType e - let hasProp ← mkAppM className (instantiateClassFn ty e) + let hasProp ← mkAppM className (← instantiateClassFn e) let hasPropInst ← trySynthInstance hasProp match hasPropInst with | LOption.some i => trace[Arith] "Found {fName} instance" let i_prop ← mkProjection i (Name.mkSimple "prop") - some (← mkAppM' i_prop (instantiateProjectionFn e)) + some (← mkAppM' i_prop (← instantiateProjectionFn e)) | _ => none -- Return an instance of `HasIntProp` for `e` if it has some def lookupHasIntProp (e : Expr) : MetaM (Option Expr) := - lookupProp "lookupHasIntProp" ``HasIntProp e (fun ty _ => #[ty]) (fun e => #[e]) + lookupProp "lookupHasIntProp" ``HasIntProp e (fun e => do pure #[← Lean.Meta.inferType e]) (fun e => pure #[e]) -- Collect the instances of `HasIntProp` for the subexpressions in the context def collectHasIntPropInstancesFromMainCtx : Tactic.TacticM (HashSet Expr) := do @@ -149,7 +151,7 @@ def collectHasIntPropInstancesFromMainCtx : Tactic.TacticM (HashSet Expr) := do -- Return an instance of `HasIntPred` for `e` if it has some def lookupHasIntPred (e : Expr) : MetaM (Option Expr) := - lookupProp "lookupHasIntPred" ``HasIntPred e (fun _ term => #[term]) (fun _ => #[]) + lookupProp "lookupHasIntPred" ``HasIntPred e (fun term => pure #[term]) (fun _ => pure #[]) -- Collect the instances of `HasIntPred` for the subexpressions in the context def collectHasIntPredInstancesFromMainCtx : Tactic.TacticM (HashSet Expr) := do |