Fix error in followedByToken

Author: odersky

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -619,13 +619,13 @@ object Parsers {
         val token = lookahead.token
         if (braces == 0) {
           if (token == query) return true
-          if (stopScanTokens.contains(token) || in.token == RBRACE) return false
+          if (stopScanTokens.contains(token) || lookahead.token == RBRACE) return false
         }
         else if (token == EOF)
           return false
-        else if (in.token == RBRACE)
+        else if (lookahead.token == RBRACE)
           braces -= 1
-        if (in.token == LBRACE) braces += 1
+        if (lookahead.token == LBRACE) braces += 1
         lookahead.nextToken()
       }
       false