diff --git a/compiler/test/dotty/tools/repl/TabcompleteTests.scala b/compiler/test/dotty/tools/repl/TabcompleteTests.scala
index ecb01d6863da..9cdb896963f1 100644
--- a/compiler/test/dotty/tools/repl/TabcompleteTests.scala
+++ b/compiler/test/dotty/tools/repl/TabcompleteTests.scala
@@ -228,4 +228,9 @@ class TabcompleteTests extends ReplTest {
       tabComplete(":d")
     )
   }
+
+  @Test def `i16551 typer phase for implicits` = initially {
+    val comp = tabComplete("BigInt(1).")
+    assertTrue(comp.distinct.nonEmpty)
+  }
 }