Use re-encoded quote pattern

Author: nicolasstucki

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

@@ -440,16 +440,15 @@ trait QuotesAndSplices {
     val matchModule = if quoted.isTerm then defn.QuoteMatching_ExprMatch else defn.QuoteMatching_TypeMatch
     val unapplyFun = quotes.asInstance(defn.QuoteMatchingClass.typeRef).select(matchModule).select(nme.unapply)
 
-    val res = UnApply(
+    val patternUnapply = UnApply(
       fun = unapplyFun.appliedToTypeTrees(typeBindingsTuple :: TypeTree(patType) :: Nil),
       implicits = quotedPattern :: Nil,
       patterns = splicePat :: Nil,
       proto = quoteClass.typeRef.appliedTo(replaceBindings(quoted1.tpe)))
 
-    val decoded = QuotePatterns.decode(res)
+    val decoded = QuotePatterns.decode(patternUnapply)
     decoded.foreach(QuotePatterns.checkPattern)
-    val encoded = decoded.map(QuotePatterns.encode).getOrElse(res)
-
-    res
+    val encoded = decoded.map(QuotePatterns.encode).getOrElse(patternUnapply)
+    encoded
   }
 }