Fix rebase breakage

Author: odersky

compiler/src/dotty/tools/dotc/ast/Positioned.scala

@@ -6,6 +6,7 @@ import util.Spans._
 import util.{SourceFile, NoSource, SourcePosition, SrcPos}
 import core.Contexts._
 import core.Decorators._
+import core.NameOps._
 import core.Flags.{JavaDefined, ExtensionMethod}
 import core.StdNames.nme
 import ast.Trees.mods

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

@@ -506,7 +506,7 @@ class Typer extends Namer
       val selection = untpd.cpy.Select(tree)(qualifier, name)
       val result = tryEither(typed(selection, pt))((_, _) => fail)
       def canAccessUnqualified(sym: Symbol) =
-        sym.isExtensionMethod && (sym.extensionParam.span == xmethod.extensionParam.span)
+        sym.is(ExtensionMethod) && (sym.extensionParam.span == xmethod.extensionParam.span)
       if !xmethod.exists || result.tpe.isError || canAccessUnqualified(result.symbol) then
         result
       else