Set typer phase after InteractiveDriver.run

Fixes #13467

Author: tgodzik

compiler/src/dotty/tools/dotc/interactive/InteractiveDriver.scala

@@ -167,6 +167,7 @@ class InteractiveDriver(val settings: List[String]) extends Driver {
       cleanup(t)
       myOpenedTrees(uri) = topLevelTrees(t, source)
       myCompilationUnits(uri) = unit
+      myCtx = myCtx.fresh.setPhase(myInitCtx.base.typerPhase.id)
 
       reporter.removeBufferedMessages
     }

language-server/src/dotty/tools/languageserver/DottyLanguageServer.scala

@@ -307,7 +307,7 @@ class DottyLanguageServer extends LanguageServer
     val pos = sourcePosition(driver, uri, params.getPosition)
     val items = driver.compilationUnits.get(uri) match {
       case Some(unit) =>
-        val freshCtx = ctx.fresh.setPeriod(Period(ctx.runId, ctx.base.typerPhase.id)).setCompilationUnit(unit)
+        val freshCtx = ctx.fresh.setCompilationUnit(unit)
         Completion.completions(pos)(using freshCtx)._2
       case None => Nil
     }

language-server/test/dotty/tools/languageserver/CompletionTest.scala

@@ -842,4 +842,20 @@ class CompletionTest {
           |object Main { "abc".xx${m1} }""".withSource
       .completion(m1, Set())
   }
+
+  @Test def concatMethodWithImplicits: Unit = {
+    code"""|object A {
+           |  Array.concat${m1}
+           |}""".withSource
+      .completion(
+          m1,
+          Set(
+            (
+              "concat",
+              Method,
+              "[T](xss: Array[T]*)(implicit evidence$11: scala.reflect.ClassTag[T]): Array[T]"
+            )
+          )
+        )
+  }
 }