chore: More code cleanup

Pantograph/Delate.lean

@@ -68,7 +68,7 @@ def _root_.Lean.Name.isAuxLemma (n : Lean.Name) : Bool := n matches .num (.str _
 /-- Unfold all lemmas created by `Lean.Meta.mkAuxLemma`. These end in `_auxLemma.nn` where `nn` is a number. -/
 @[export pantograph_unfold_aux_lemmas_m]
 def unfoldAuxLemmas : Expr → CoreM Expr :=
-  (Lean.Meta.deltaExpand · Lean.Name.isAuxLemma)
+  (Meta.deltaExpand · Lean.Name.isAuxLemma)
 /-- Unfold all matcher applications -/
 @[export pantograph_unfold_matchers_m]
 def unfoldMatchers (expr : Expr) : CoreM Expr :=
@@ -97,7 +97,7 @@ This function ensures any metavariable in the result is either
 partial def instantiateDelayedMVars (expr : Expr) : MetaM Expr :=
   withTraceNode `Pantograph.Delate (λ _ex => return m!":= {← Meta.ppExpr expr}") do
   let mut result ← Meta.transform (← instantiateMVars expr)
-    (pre := fun e => e.withApp fun f args => do
+    λ e => e.withApp fun f args => do
     let .mvar mvarId := f | return .continue
     trace[Pantograph.Delate] "V {e}"
     let mvarDecl ← mvarId.getDecl
@@ -156,7 +156,7 @@ partial def instantiateDelayedMVars (expr : Expr) : MetaM Expr :=
           trace[Pantograph.Delate] "─ Arguments End"
 
         trace[Pantograph.Delate] "M ?{mvarId.name}"
-          return .done (mkAppN f args))
+        return .done (mkAppN f args)
   trace[Pantoraph.Delate] "Result {result}"
   return result
   where