diff --git a/community-build/src/scala/dotty/communitybuild/projects.scala b/community-build/src/scala/dotty/communitybuild/projects.scala
index 9168da954952..2497c10a525b 100644
--- a/community-build/src/scala/dotty/communitybuild/projects.scala
+++ b/community-build/src/scala/dotty/communitybuild/projects.scala
@@ -397,7 +397,8 @@ object projects:
 
   lazy val shapeless = SbtCommunityProject(
     project       = "shapeless",
-    sbtTestCommand   = "test",
+    sbtTestCommand = """set deriving/scalacOptions -= "-Xfatal-warnings"; set typeable/scalacOptions -= "-Xfatal-warnings"; test""",
+      // selectively disable -Xfatal-warnings due to deprecations
     sbtDocCommand = forceDoc("typeable", "deriving", "data"),
     scalacOptions = Nil // disable -Ysafe-init, due to -Xfatal-warnings
   )
@@ -702,7 +703,14 @@ object projects:
   lazy val akka = SbtCommunityProject(
     project = "akka",
     extraSbtArgs = List(s"-Dakka.build.scalaVersion=$testedCompilerVersion"),
-    sbtTestCommand = "set every targetSystemJdk := true; akka-actor-tests/Test/compile",
+    sbtTestCommand = List(
+      "set every targetSystemJdk := true",
+      // selectively disable -Xfatal-warnings due to deprecations
+      """set actor/Compile/scalacOptions -= "-Xfatal-warnings"""",
+      """set testkit/Compile/scalacOptions -= "-Xfatal-warnings"""",
+      """set actorTests/Compile/scalacOptions -= "-Xfatal-warnings"""",
+      "akka-actor-tests/Test/compile",
+    ).mkString("; "),
     dependencies = () => List(scalatest, scalatestplusJunit, scalatestplusScalacheck)
   )
 
diff --git a/compiler/src/dotty/tools/dotc/Run.scala b/compiler/src/dotty/tools/dotc/Run.scala
index 3c48e737cff8..daf7415b4af6 100644
--- a/compiler/src/dotty/tools/dotc/Run.scala
+++ b/compiler/src/dotty/tools/dotc/Run.scala
@@ -321,10 +321,11 @@ class Run(comp: Compiler, ictx: Context) extends ImplicitRunInfo with Constraint
     compileSources(sources)
   }
 
-  /** Print summary; return # of errors encountered */
+  /** Print summary of warnings and errors encountered */
   def printSummary(): Unit = {
     printMaxConstraint()
     val r = runContext.reporter
+    r.summarizeUnreportedWarnings
     r.printSummary
   }
 
diff --git a/compiler/src/dotty/tools/dotc/reporting/Reporter.scala b/compiler/src/dotty/tools/dotc/reporting/Reporter.scala
index 39ece915ca83..d5229efd58c5 100644
--- a/compiler/src/dotty/tools/dotc/reporting/Reporter.scala
+++ b/compiler/src/dotty/tools/dotc/reporting/Reporter.scala
@@ -207,11 +207,15 @@ abstract class Reporter extends interfaces.ReporterResult {
       b += countString(warningCount, "warning") + " found"
     if (errorCount > 0)
       b += countString(errorCount, "error") + " found"
-    for ((settingName, count) <- unreportedWarnings)
-      b += s"there were $count ${settingName.tail} warning(s); re-run with $settingName for details"
     b.mkString("\n")
   }
 
+  def summarizeUnreportedWarnings(using Context): Unit =
+    for (settingName, count) <- unreportedWarnings do
+      val were = if count == 1 then "was" else "were"
+      val msg = s"there $were ${countString(count, settingName.tail + " warning")}; re-run with $settingName for details"
+      report(Warning(msg, NoSourcePosition))
+
   /** Print the summary of warnings and errors */
   def printSummary(using Context): Unit = {
     val s = summary
diff --git a/compiler/test-resources/repl/reset-command b/compiler/test-resources/repl/reset-command
index 5ec643f28b0e..0adf0d93a0d8 100644
--- a/compiler/test-resources/repl/reset-command
+++ b/compiler/test-resources/repl/reset-command
@@ -1,5 +1,6 @@
 scala> def f(thread: Thread) = thread.stop()
-there were 1 deprecation warning(s); re-run with -deprecation for details
+there was 1 deprecation warning; re-run with -deprecation for details
+1 warning found
 def f(thread: Thread): Unit
 
 scala>:reset -deprecation
diff --git a/compiler/test-resources/repl/settings-command b/compiler/test-resources/repl/settings-command
index db4b1af7343f..5e9912384435 100644
--- a/compiler/test-resources/repl/settings-command
+++ b/compiler/test-resources/repl/settings-command
@@ -1,5 +1,6 @@
 scala> def f(thread: Thread) = thread.stop()
-there were 1 deprecation warning(s); re-run with -deprecation for details
+there was 1 deprecation warning; re-run with -deprecation for details
+1 warning found
 def f(thread: Thread): Unit
 
 scala>:settings -deprecation foo.scala
diff --git a/compiler/test/dotty/tools/dotc/CompilationTests.scala b/compiler/test/dotty/tools/dotc/CompilationTests.scala
index 4ea8db553f54..8e199dd45420 100644
--- a/compiler/test/dotty/tools/dotc/CompilationTests.scala
+++ b/compiler/test/dotty/tools/dotc/CompilationTests.scala
@@ -33,7 +33,6 @@ class CompilationTests {
       compileFilesInDir("tests/pos-special/sourcepath/outer", defaultOptions.and("-sourcepath", "tests/pos-special/sourcepath")),
       compileFile("tests/pos-special/sourcepath/outer/nested/Test4.scala", defaultOptions.and("-sourcepath", "tests/pos-special/sourcepath")),
       compileFilesInDir("tests/pos-special/fatal-warnings", defaultOptions.and("-Xfatal-warnings", "-deprecation", "-feature")),
-      compileFile("tests/pos-special/avoid-warn-deprecation.scala", defaultOptions.and("-Xfatal-warnings", "-feature")),
       compileFilesInDir("tests/pos-special/spec-t5545", defaultOptions),
       compileFilesInDir("tests/pos-special/strawman-collections", allowDeepSubtypes),
       compileFilesInDir("tests/pos-special/isInstanceOf", allowDeepSubtypes.and("-Xfatal-warnings")),
@@ -141,6 +140,7 @@ class CompilationTests {
       compileFilesInDir("tests/neg-custom-args/no-experimental", defaultOptions.and("-Yno-experimental")),
       compileDir("tests/neg-custom-args/impl-conv", defaultOptions.and("-Xfatal-warnings", "-feature")),
       compileDir("tests/neg-custom-args/i13946", defaultOptions.and("-Xfatal-warnings", "-feature")),
+      compileFile("tests/neg-custom-args/avoid-warn-deprecation.scala", defaultOptions.and("-Xfatal-warnings", "-feature")),
       compileFile("tests/neg-custom-args/implicit-conversions.scala", defaultOptions.and("-Xfatal-warnings", "-feature")),
       compileFile("tests/neg-custom-args/implicit-conversions-old.scala", defaultOptions.and("-Xfatal-warnings", "-feature")),
       compileFile("tests/neg-custom-args/i3246.scala", scala2CompatMode),
diff --git a/sbt-test/compilerReporter/i14576/Test.scala b/sbt-test/compilerReporter/i14576/Test.scala
new file mode 100644
index 000000000000..d94a49145f81
--- /dev/null
+++ b/sbt-test/compilerReporter/i14576/Test.scala
@@ -0,0 +1,17 @@
+// lampepfl/dotty#14576, Writer is in a separate file and not declared `open`
+//   under -source:future this requires -language:adhocExtensions
+class ExtWriter extends Writer
+
+class Text(val str: String)
+
+object Test:
+  // lampepfl/dotty#14500, requires implicitConversions feature
+  given Conversion[String, Text] = Text(_)
+  def f(x: Text) = println(x.str)
+  f("abc")
+
+  // private[this] and = _ are deprecated under -source:future
+  private[this] var x: AnyRef = _
+
+  // under -source:future, `_` is deprecated for wildcard arguments of types: use `?` instead
+  val xs: List[_] = Nil
diff --git a/sbt-test/compilerReporter/i14576/Writer.scala b/sbt-test/compilerReporter/i14576/Writer.scala
new file mode 100644
index 000000000000..2d9d5f834994
--- /dev/null
+++ b/sbt-test/compilerReporter/i14576/Writer.scala
@@ -0,0 +1 @@
+class Writer
diff --git a/sbt-test/compilerReporter/i14576/build.sbt b/sbt-test/compilerReporter/i14576/build.sbt
new file mode 100644
index 000000000000..9831c23c103e
--- /dev/null
+++ b/sbt-test/compilerReporter/i14576/build.sbt
@@ -0,0 +1,38 @@
+import sbt.internal.util.ConsoleAppender
+
+scalaVersion := sys.props("plugin.scalaVersion")
+
+lazy val assertFeatureSummary = taskKey[Unit]("checks that feature warning summary is emitted")
+lazy val assertNoFeatureSummary = taskKey[Unit]("checks that no feature warning summary is emitted")
+lazy val assertDeprecationSummary = taskKey[Unit]("checks that deprecation warning summary is emitted")
+lazy val assertNoDeprecationSummary = taskKey[Unit]("checks that no deprecation warning summary is emitted")
+lazy val resetMessages = taskKey[Unit]("empties the messages list")
+
+lazy val root = (project in file("."))
+  .settings(
+    scalacOptions += "-source:future",
+    extraAppenders := { s => Seq(ConsoleAppender(FakePrintWriter)) },
+    assertFeatureSummary := {
+      assert {
+        FakePrintWriter.messages.exists(_.contains("there were 2 feature warnings; re-run with -feature for details"))
+      }
+    },
+    assertNoFeatureSummary := {
+      assert {
+        FakePrintWriter.messages.forall(!_.contains("; re-run with -feature for details"))
+      }
+    },
+    assertDeprecationSummary := {
+      assert {
+        FakePrintWriter.messages.exists(_.contains("there were 3 deprecation warnings; re-run with -deprecation for details"))
+      }
+    },
+    assertNoDeprecationSummary := {
+      assert {
+        FakePrintWriter.messages.forall(!_.contains("; re-run with -deprecation for details"))
+      }
+    },
+    resetMessages := {
+      FakePrintWriter.resetMessages
+    },
+  )
diff --git a/sbt-test/compilerReporter/i14576/project/FakePrintWriter.scala b/sbt-test/compilerReporter/i14576/project/FakePrintWriter.scala
new file mode 100644
index 000000000000..14d3bcdba5b4
--- /dev/null
+++ b/sbt-test/compilerReporter/i14576/project/FakePrintWriter.scala
@@ -0,0 +1,6 @@
+object FakePrintWriter extends java.io.PrintWriter("fake-print-writer") {
+  @volatile var messages = List.empty[String]
+  def resetMessages = messages = List.empty[String]
+  override def println(x: String): Unit = messages = x :: messages
+  override def print(x: String): Unit = messages = x :: messages
+}
diff --git a/sbt-test/compilerReporter/i14576/test b/sbt-test/compilerReporter/i14576/test
new file mode 100644
index 000000000000..32bd16066861
--- /dev/null
+++ b/sbt-test/compilerReporter/i14576/test
@@ -0,0 +1,19 @@
+> compile
+> assertFeatureSummary
+> assertDeprecationSummary
+
+> resetMessages
+
+> set scalacOptions += "-feature"
+> compile
+> assertNoFeatureSummary
+> assertDeprecationSummary
+
+> resetMessages
+
+> set scalacOptions += "-deprecation"
+> compile
+> assertNoFeatureSummary
+> assertNoDeprecationSummary
+
+> resetMessages
diff --git a/tests/init/pos/lazylist1.scala b/tests/init/pos/lazylist1.scala
index 3ff0f9bc449d..62a45ca28f00 100644
--- a/tests/init/pos/lazylist1.scala
+++ b/tests/init/pos/lazylist1.scala
@@ -1,3 +1,5 @@
+import scala.language.implicitConversions
+
 class LazyList[A]
 
 object LazyList {
diff --git a/tests/neg-custom-args/avoid-warn-deprecation.check b/tests/neg-custom-args/avoid-warn-deprecation.check
new file mode 100644
index 000000000000..8fceac02ba8f
--- /dev/null
+++ b/tests/neg-custom-args/avoid-warn-deprecation.check
@@ -0,0 +1 @@
+there was 1 deprecation warning; re-run with -deprecation for details
diff --git a/tests/pos-special/avoid-warn-deprecation.scala b/tests/neg-custom-args/avoid-warn-deprecation.scala
similarity index 55%
rename from tests/pos-special/avoid-warn-deprecation.scala
rename to tests/neg-custom-args/avoid-warn-deprecation.scala
index 2b24b1094c87..fc8d71dd7f60 100644
--- a/tests/pos-special/avoid-warn-deprecation.scala
+++ b/tests/neg-custom-args/avoid-warn-deprecation.scala
@@ -6,3 +6,4 @@ object A {
 object B {
   A.foo
 }
+// nopos-error there was 1 deprecation warning; re-run with -deprecation for details
diff --git a/tests/neg-custom-args/conditionalWarnings.scala b/tests/neg-custom-args/conditionalWarnings.scala
index b529cf6c6f81..a85e3c8af427 100644
--- a/tests/neg-custom-args/conditionalWarnings.scala
+++ b/tests/neg-custom-args/conditionalWarnings.scala
@@ -10,5 +10,6 @@ object Test {
   val x: Int = "abc"
     // OK, since -feature warnings are not enabled.
     // The program compiles with final line
-    // there were 1 feature warning(s); re-run with -feature for details
+    // there was 1 feature warning; re-run with -feature for details
+    // nopos-error
 }
diff --git a/tests/neg-custom-args/fatal-warnings/i12253.check b/tests/neg-custom-args/fatal-warnings/i12253.check
index 1cda504511af..9a88c111f734 100644
--- a/tests/neg-custom-args/fatal-warnings/i12253.check
+++ b/tests/neg-custom-args/fatal-warnings/i12253.check
@@ -6,3 +6,4 @@
 11 |     case extractors.InlinedLambda(_, Select(_, name)) => Expr(name) // error // error
    |                                      ^
    |                                      the type test for q1.reflect.Select cannot be checked at runtime
+there was 1 deprecation warning; re-run with -deprecation for details
diff --git a/tests/neg-custom-args/fatal-warnings/i12253.scala b/tests/neg-custom-args/fatal-warnings/i12253.scala
index 5fdf1c83504d..88cae0c9f3ec 100644
--- a/tests/neg-custom-args/fatal-warnings/i12253.scala
+++ b/tests/neg-custom-args/fatal-warnings/i12253.scala
@@ -25,4 +25,4 @@ object MacroUtils:
 
   end Extractors
 end MacroUtils
-
+// nopos-error
diff --git a/tests/neg-custom-args/i13838.check b/tests/neg-custom-args/i13838.check
index f6866dc6bf2a..365f25a4591f 100644
--- a/tests/neg-custom-args/i13838.check
+++ b/tests/neg-custom-args/i13838.check
@@ -24,3 +24,4 @@
    |     Larger values might make a very large search problem succeed.
    |
    | longer explanation available when compiling with `-explain`
+there was 1 feature warning; re-run with -feature for details