Cleanup level logic

Author: nicolasstucki

compiler/src/dotty/tools/dotc/typer/Inliner.scala

@@ -1880,9 +1880,9 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(using Context) {
     new TreeAccumulator[List[Symbol]] {
       private var level = -1
       override def apply(syms: List[Symbol], tree: tpd.Tree)(using Context): List[Symbol] =
-        if (level != -1) foldOver(syms, tree)
+        if level != -1 then foldOver(syms, tree)
         else tree match {
-          case tree: RefTree if level == -1 && tree.symbol.isDefinedInCurrentRun && !tree.symbol.isLocal =>
+          case tree: RefTree if tree.symbol.isDefinedInCurrentRun && !tree.symbol.isLocal =>
             foldOver(tree.symbol :: syms, tree)
           case Quoted(body) =>
             level += 1
@@ -1896,7 +1896,7 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(using Context) {
             level -= 1
             try apply(syms, body)
             finally level += 1
-          case TypeApply(fun, _) if level == -1 =>
+          case TypeApply(fun, _) =>
             apply(syms, fun)
           case _ =>
             foldOver(syms, tree)