backtick when path segment is scala keyword

integration/feature/keyword-module/resources/build.mill

@@ -0,0 +1,2 @@
+package build
+import $packages._

integration/feature/keyword-module/resources/import/package.mill

@@ -0,0 +1,7 @@
+package build.`import`
+import mill._, scalalib._
+
+object `package` extends RootModule with ScalaModule {
+  def scalaVersion = "2.13.11"
+}
+

integration/feature/keyword-module/resources/import/src/Foo.scala

@@ -0,0 +1,3 @@
+package `import`
+
+object foo

integration/feature/keyword-module/src/KeywordModuleTests.scala

@@ -0,0 +1,15 @@
+package mill.integration
+
+import mill.testkit.UtestIntegrationTestSuite
+
+import utest._
+
+object KeywordModuleTest extends UtestIntegrationTestSuite {
+  val tests: Tests = Tests {
+    test("test") - integrationTest { tester =>
+      import tester._
+
+      assert(eval("import.compile").isSuccess)
+    }
+  }
+}

runner/src/mill/runner/FileImportGraph.scala

@@ -5,6 +5,7 @@ import mill.main.client.CodeGenConstants._
 import mill.main.client.OutFiles._
 
 import scala.reflect.NameTransformer.encode
+import scala.reflect.runtime
 import scala.collection.mutable
 
 /**
@@ -33,7 +34,7 @@ case class FileImportGraph(
 object FileImportGraph {
   def backtickWrap(s: String): String = s match {
     case s"`$v`" => s
-    case _ => if (encode(s) == s) s else "`" + s + "`"
+    case _ => if (encode(s) == s) runtime.universe.asInstanceOf[runtime.JavaUniverse].quotedName(s) else "`" + s + "`"
   }
 
   import mill.api.JsonFormatters.pathReadWrite