Workaround stack issues

Author: nicolasstucki

library/src/scala/quoted/unsafe/UnsafeExpr.scala

@@ -40,23 +40,23 @@ object UnsafeExpr {
    */
   def open[T1, R, X](f: Expr[T1 => R])(content: (Expr[R], [t] => Expr[t] => Expr[T1] => Expr[t]) => X)(given qctx: QuoteContext): X = {
     import qctx.tasty.{given, _}
-    val (params, bodyExpr) = paramsAndBody(f)
+    val (params, bodyExpr) = paramsAndBody[R](f)
     content(bodyExpr, [t] => (e: Expr[t]) => (v: Expr[T1]) => bodyFn[t](e.unseal, params, List(v.unseal)).seal.asInstanceOf[Expr[t]])
   }
 
   def open[T1, T2, R, X](f: Expr[(T1, T2) => R])(content: (Expr[R], [t] => Expr[t] => (Expr[T1], Expr[T2]) => Expr[t]) => X)(given qctx: QuoteContext)(given DummyImplicit): X = {
     import qctx.tasty.{given, _}
-    val (params, bodyExpr) = paramsAndBody(f)
+    val (params, bodyExpr) = paramsAndBody[R](f)
     content(bodyExpr, [t] => (e: Expr[t]) => (v1: Expr[T1], v2: Expr[T2]) => bodyFn[t](e.unseal, params, List(v1.unseal, v2.unseal)).seal.asInstanceOf[Expr[t]])
   }
 
   def open[T1, T2, T3, R, X](f: Expr[(T1, T2, T3) => R])(content: (Expr[R], [t] => Expr[t] => (Expr[T1], Expr[T2], Expr[T3]) => Expr[t]) => X)(given qctx: QuoteContext)(given DummyImplicit, DummyImplicit): X = {
     import qctx.tasty.{given, _}
-    val (params, bodyExpr) = paramsAndBody(f)
+    val (params, bodyExpr) = paramsAndBody[R](f)
     content(bodyExpr, [t] => (e: Expr[t]) => (v1: Expr[T1], v2: Expr[T2], v3: Expr[T3]) => bodyFn[t](e.unseal, params, List(v1.unseal, v2.unseal, v3.unseal)).seal.asInstanceOf[Expr[t]])
   }
 
-  private def paramsAndBody[R](given qctx: QuoteContext)(f: Expr[Any]) = {
+  private def paramsAndBody[R](given qctx: QuoteContext)(f: Expr[Any]): (List[qctx.tasty.ValDef], Expr[R]) = {
     import qctx.tasty.{given, _}
     val Block(List(DefDef("$anonfun", Nil, List(params), _, Some(body))), Closure(Ident("$anonfun"), None)) = f.unseal.etaExpand
     (params, body.seal.asInstanceOf[Expr[R]])