Avoid tuples

Author: nicolasstucki

compiler/src/dotty/tools/dotc/transform/PatternMatcher.scala

@@ -219,9 +219,13 @@ object PatternMatcher {
             case Nil => matchArgsPatternPlan(args, syms.reverse)
           }
         def matchArgsPatternPlan(args: List[Tree], syms: List[Symbol]): Plan =
-          ((args, syms): @unchecked) match { // both lists should always have the same size
-            case (arg :: args1, sym :: syms1) => patternPlan(sym, arg, matchArgsPatternPlan(args1, syms1), onFailure)
-            case (Nil, Nil) => onSuccess
+          args match {
+            case arg :: args1 =>
+              val sym :: syms1 = syms
+              patternPlan(sym, arg, matchArgsPatternPlan(args1, syms1), onFailure)
+            case Nil =>
+              assert(syms.isEmpty)
+              onSuccess
           }
         matchArgsSelectorsPlan(selectors, Nil)
       }