diff --git a/compiler/src/dotty/tools/backend/jvm/ClassfileWriters.scala b/compiler/src/dotty/tools/backend/jvm/ClassfileWriters.scala
index 5a32363e5fda..e881ad66f09a 100644
--- a/compiler/src/dotty/tools/backend/jvm/ClassfileWriters.scala
+++ b/compiler/src/dotty/tools/backend/jvm/ClassfileWriters.scala
@@ -12,12 +12,13 @@ import java.util.zip.{CRC32, Deflater, ZipEntry, ZipOutputStream}
 
 import dotty.tools.dotc.core.Contexts.*
 import dotty.tools.dotc.core.Decorators.em
-import dotty.tools.dotc.util.chaining.*
 import dotty.tools.io.{AbstractFile, PlainFile, VirtualFile}
 import dotty.tools.io.PlainFile.toPlainFile
 import BTypes.InternalName
 import dotty.tools.io.JarArchive
 
+import scala.util.chaining.*
+
 /** !!! This file is now copied in `dotty.tools.io.FileWriters` in a more general way that does not rely upon
  * `PostProcessorFrontendAccess`, this should probably be changed to wrap that class instead.
  *
diff --git a/compiler/src/dotty/tools/debug/JavaEncoding.scala b/compiler/src/dotty/tools/debug/JavaEncoding.scala
index d461c7b0d23c..e220f4e781cf 100644
--- a/compiler/src/dotty/tools/debug/JavaEncoding.scala
+++ b/compiler/src/dotty/tools/debug/JavaEncoding.scala
@@ -6,7 +6,7 @@ import dotty.tools.dotc.core.Symbols.*
 import dotty.tools.dotc.core.Flags.*
 import dotty.tools.dotc.core.Names.*
 import dotty.tools.backend.jvm.DottyBackendInterface.symExtensions
-import dotty.tools.dotc.util.NameTransformer
+import scala.reflect.NameTransformer
 
 // Inspired by https://github.com/lampepfl/dotty/blob/main/compiler/src/dotty/tools/backend/sjs/JSEncoding.scala
 private object JavaEncoding:
@@ -26,7 +26,7 @@ private object JavaEncoding:
     else className(sym)
 
   def encode(name: TermName)(using Context): String =
-    NameTransformer.encode(name.toSimpleName).toString
+    NameTransformer.encode(name.toString)
 
   private def binaryName(tpe: Type)(using Context): String =
     tpe match
diff --git a/compiler/src/dotty/tools/dotc/Driver.scala b/compiler/src/dotty/tools/dotc/Driver.scala
index f8daabf3ec5d..16743d56c62f 100644
--- a/compiler/src/dotty/tools/dotc/Driver.scala
+++ b/compiler/src/dotty/tools/dotc/Driver.scala
@@ -10,10 +10,10 @@ import dotty.tools.io.{AbstractFile, FileExtension}
 import reporting.*
 import core.Decorators.*
 import config.Feature
-import util.chaining.*
+import fromtasty.{TASTYCompiler, TastyFileUtil}
 
 import scala.util.control.NonFatal
-import fromtasty.{TASTYCompiler, TastyFileUtil}
+import scala.util.chaining.*
 
 /** Run the Dotty compiler.
  *
diff --git a/compiler/src/dotty/tools/dotc/Run.scala b/compiler/src/dotty/tools/dotc/Run.scala
index 58ea3e03edba..5c659101332d 100644
--- a/compiler/src/dotty/tools/dotc/Run.scala
+++ b/compiler/src/dotty/tools/dotc/Run.scala
@@ -38,7 +38,6 @@ import Run.Progress
 import scala.compiletime.uninitialized
 import dotty.tools.dotc.transform.MegaPhase
 import dotty.tools.dotc.transform.Pickler.AsyncTastyHolder
-import dotty.tools.dotc.util.chaining.*
 import java.util.{Timer, TimerTask}
 
 /** A compiler run. Exports various methods to compile source files */
diff --git a/compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala b/compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala
index 051b4d8f3b5b..c7cef874ef8d 100644
--- a/compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala
+++ b/compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala
@@ -17,7 +17,6 @@ import typer.Checking.{checkBounds, checkAppliedTypesIn}
 import typer.ErrorReporting.err
 import typer.ProtoTypes.{LhsProto, WildcardSelectionProto, SelectionProto}
 import util.{SimpleIdentitySet, EqHashMap, EqHashSet, SrcPos, Property}
-import util.chaining.tap
 import transform.{Recheck, PreRecheck, CapturedVars}
 import Recheck.*
 import scala.collection.mutable
@@ -32,6 +31,7 @@ import Capabilities.*
 import Mutability.*
 import util.common.alwaysTrue
 import scala.annotation.constructorOnly
+import scala.util.chaining.*
 
 /** The capture checker */
 object CheckCaptures:
diff --git a/compiler/src/dotty/tools/dotc/cc/Setup.scala b/compiler/src/dotty/tools/dotc/cc/Setup.scala
index 5c8c581f729c..b805339a9e60 100644
--- a/compiler/src/dotty/tools/dotc/cc/Setup.scala
+++ b/compiler/src/dotty/tools/dotc/cc/Setup.scala
@@ -13,7 +13,6 @@ import ast.tpd, tpd.*
 import transform.{PreRecheck, Recheck}, Recheck.*
 import Synthetics.isExcluded
 import util.SimpleIdentitySet
-import util.chaining.*
 import reporting.Message
 import printing.{Printer, Texts}, Texts.{Text, Str}
 import collection.mutable
diff --git a/compiler/src/dotty/tools/dotc/config/CliCommand.scala b/compiler/src/dotty/tools/dotc/config/CliCommand.scala
index 4c750c613940..cdfa85cef36d 100644
--- a/compiler/src/dotty/tools/dotc/config/CliCommand.scala
+++ b/compiler/src/dotty/tools/dotc/config/CliCommand.scala
@@ -6,8 +6,8 @@ import core.Contexts.*
 import printing.Highlighting
 import reporting.NoExplanation
 
-import dotty.tools.dotc.util.chaining.*
 import scala.PartialFunction.cond
+import scala.util.chaining.*
 
 trait CliCommand:
 
diff --git a/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala b/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
index 129a77e7e43f..cd6a218e7ada 100644
--- a/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
+++ b/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
@@ -10,7 +10,7 @@ import dotty.tools.io.{AbstractFile, Directory, PlainDirectory, NoAbstractFile}
 import Setting.ChoiceWithHelp
 import ScalaSettingCategories.*
 
-import dotty.tools.dotc.util.chaining.*
+import scala.util.chaining.*
 
 import java.util.zip.Deflater
 
diff --git a/compiler/src/dotty/tools/dotc/config/Settings.scala b/compiler/src/dotty/tools/dotc/config/Settings.scala
index 105ebda16de1..b6ebe8b01eb1 100644
--- a/compiler/src/dotty/tools/dotc/config/Settings.scala
+++ b/compiler/src/dotty/tools/dotc/config/Settings.scala
@@ -12,7 +12,6 @@ import reflect.ClassTag
 import scala.util.{Success, Failure}
 
 import config.Settings.Setting.ChoiceWithHelp
-import util.chaining.*
 
 object Settings:
 
diff --git a/compiler/src/dotty/tools/dotc/core/Names.scala b/compiler/src/dotty/tools/dotc/core/Names.scala
index f94cebd6a5ec..dbc8e5196b40 100644
--- a/compiler/src/dotty/tools/dotc/core/Names.scala
+++ b/compiler/src/dotty/tools/dotc/core/Names.scala
@@ -3,7 +3,6 @@ package dotc
 package core
 
 import scala.io.Codec
-import util.NameTransformer
 import printing.{Showable, Texts, Printer}
 import Texts.Text
 import StdNames.str
@@ -11,6 +10,7 @@ import config.Config
 import util.{LinearMap, HashSet}
 
 import scala.annotation.internal.sharable
+import scala.reflect.NameTransformer
 
 object Names {
   import NameKinds.*
@@ -346,10 +346,10 @@ object Names {
     override def encode: SimpleName = {
       val dontEncode =
         this == StdNames.nme.CONSTRUCTOR || this == StdNames.nme.STATIC_CONSTRUCTOR
-      if (dontEncode) this else NameTransformer.encode(this)
+      if (dontEncode) this else termName(NameTransformer.encode(this.toString))
     }
 
-    override def decode: SimpleName = NameTransformer.decode(this)
+    override def decode: SimpleName = termName(NameTransformer.decode(this.toString))
 
     override def isEmpty: Boolean = length == 0
 
diff --git a/compiler/src/dotty/tools/dotc/inlines/Inlines.scala b/compiler/src/dotty/tools/dotc/inlines/Inlines.scala
index 3aceec2a5b4e..016c89afb7b6 100644
--- a/compiler/src/dotty/tools/dotc/inlines/Inlines.scala
+++ b/compiler/src/dotty/tools/dotc/inlines/Inlines.scala
@@ -21,10 +21,11 @@ import staging.StagingLevel
 import cc.CleanupRetains
 
 import collection.mutable
+import scala.util.chaining.*
+
 import reporting.{NotConstant, trace}
 import util.Spans.Span
 import dotty.tools.dotc.core.Periods.PhaseId
-import dotty.tools.dotc.util.chaining.*
 
 /** Support for querying inlineable methods and for inlining calls to such methods */
 object Inlines:
diff --git a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala b/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
index 85cdcfed6950..6200091f1f12 100644
--- a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
+++ b/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
@@ -4,9 +4,12 @@ package parsing
 
 import scala.language.unsafeNulls
 
+import scala.annotation.tailrec
 import scala.annotation.internal.sharable
 import scala.collection.mutable.ListBuffer
 import scala.collection.immutable.BitSet
+import scala.util.chaining.*
+
 import util.{ SourceFile, SourcePosition, NoSourcePosition }
 import Tokens.*
 import Scanners.*
@@ -26,7 +29,6 @@ import Symbols.NoSymbol
 import ScriptParsers.*
 import Decorators.*
 import util.Chars
-import scala.annotation.tailrec
 import rewrites.Rewrites.{overlapsPatch, patch, unpatch}
 import reporting.*
 import config.Feature
@@ -34,7 +36,6 @@ import config.Feature.{sourceVersion, migrateTo3}
 import config.SourceVersion.*
 import config.SourceVersion
 import dotty.tools.dotc.config.MigrationVersion
-import dotty.tools.dotc.util.chaining.*
 import dotty.tools.dotc.config.Feature.ccEnabled
 
 object Parsers {
diff --git a/compiler/src/dotty/tools/dotc/reporting/Diagnostic.scala b/compiler/src/dotty/tools/dotc/reporting/Diagnostic.scala
index a4c30b4658e9..9fb46af2d475 100644
--- a/compiler/src/dotty/tools/dotc/reporting/Diagnostic.scala
+++ b/compiler/src/dotty/tools/dotc/reporting/Diagnostic.scala
@@ -6,10 +6,11 @@ import dotty.tools.dotc.config.Settings.Setting
 import dotty.tools.dotc.core.Contexts.*
 import dotty.tools.dotc.interfaces.Diagnostic.{ERROR, INFO, WARNING}
 import dotty.tools.dotc.util.SourcePosition
-import dotty.tools.dotc.util.chaining.*
+import core.Decorators.toMessage
+
+import scala.util.chaining.*
 
 import java.util.{Collections, Optional, List => JList}
-import core.Decorators.toMessage
 
 object Diagnostic:
 
diff --git a/compiler/src/dotty/tools/dotc/sbt/ExtractAPI.scala b/compiler/src/dotty/tools/dotc/sbt/ExtractAPI.scala
index 41a586b46b43..cff1aa8eabab 100644
--- a/compiler/src/dotty/tools/dotc/sbt/ExtractAPI.scala
+++ b/compiler/src/dotty/tools/dotc/sbt/ExtractAPI.scala
@@ -27,9 +27,8 @@ import java.io.PrintWriter
 import ExtractAPI.NonLocalClassSymbolsInCurrentUnits
 
 import scala.collection.mutable
+import scala.util.chaining.*
 import scala.util.hashing.MurmurHash3
-import dotty.tools.dotc.util.chaining.*
-
 /** This phase sends a representation of the API of classes to sbt via callbacks.
  *
  *  This is used by sbt for incremental recompilation.
diff --git a/compiler/src/dotty/tools/dotc/semanticdb/TypeOps.scala b/compiler/src/dotty/tools/dotc/semanticdb/TypeOps.scala
index 3f156e5a7b40..d60922df8ef8 100644
--- a/compiler/src/dotty/tools/dotc/semanticdb/TypeOps.scala
+++ b/compiler/src/dotty/tools/dotc/semanticdb/TypeOps.scala
@@ -11,11 +11,11 @@ import core.Names.Name
 import core.StdNames.tpnme
 
 import collection.mutable
+import scala.util.chaining.*
 
 import dotty.tools.dotc.{semanticdb => s}
 import Scala3.{FakeSymbol, SemanticSymbol, WildcardTypeSymbol, TypeParamRefSymbol, TermParamRefSymbol, RefinementSymbol}
 import dotty.tools.dotc.core.Names.Designator
-import dotty.tools.dotc.util.chaining.*
 
 class TypeOps:
   import SymbolScopeOps.*
diff --git a/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala b/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
index b48afd24a121..b6ee886e6555 100644
--- a/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
+++ b/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
@@ -20,11 +20,11 @@ import typer.Deriving.OriginalTypeClass
 import typer.Implicits.{ContextualImplicits, RenamedImplicitRef}
 import util.{Property, Spans, SrcPos}, Spans.Span
 import util.Chars.{isLineBreakChar, isWhitespace}
-import util.chaining.*
 
 import java.util.IdentityHashMap
 
 import scala.collection.mutable, mutable.{ArrayBuilder, ListBuffer, Stack}
+import scala.util.chaining.*
 
 import CheckUnused.*
 
diff --git a/compiler/src/dotty/tools/dotc/transform/Pickler.scala b/compiler/src/dotty/tools/dotc/transform/Pickler.scala
index 7aeaeb4e319d..dcc352782644 100644
--- a/compiler/src/dotty/tools/dotc/transform/Pickler.scala
+++ b/compiler/src/dotty/tools/dotc/transform/Pickler.scala
@@ -28,9 +28,9 @@ import dotty.tools.dotc.transform.Pickler.writeSigFilesAsync
 import dotty.tools.io.FileWriters.{EagerReporter, BufferingReporter}
 import dotty.tools.dotc.sbt.interfaces.IncrementalCallback
 import dotty.tools.dotc.sbt.asyncZincPhasesCompleted
-import dotty.tools.dotc.util.chaining.*
 import scala.concurrent.ExecutionContext
 import scala.util.control.NonFatal
+import scala.util.chaining.*
 import java.util.concurrent.atomic.AtomicBoolean
 import java.nio.file.Files
 
diff --git a/compiler/src/dotty/tools/dotc/transform/localopt/FormatChecker.scala b/compiler/src/dotty/tools/dotc/transform/localopt/FormatChecker.scala
index 83ec7fb8399e..dda2d628eb4f 100644
--- a/compiler/src/dotty/tools/dotc/transform/localopt/FormatChecker.scala
+++ b/compiler/src/dotty/tools/dotc/transform/localopt/FormatChecker.scala
@@ -3,6 +3,7 @@ package transform.localopt
 
 import scala.annotation.tailrec
 import scala.collection.mutable.ListBuffer
+import scala.util.chaining.*
 import scala.util.matching.Regex.Match
 
 import dotty.tools.dotc.ast.tpd.{Match => _, *}
@@ -12,7 +13,6 @@ import dotty.tools.dotc.core.Types.*
 import dotty.tools.dotc.core.Phases.typerPhase
 import dotty.tools.dotc.reporting.BadFormatInterpolation
 import dotty.tools.dotc.util.Spans.Span
-import dotty.tools.dotc.util.chaining.*
 
 /** Formatter string checker. */
 class TypedFormatChecker(partsElems: List[Tree], parts: List[String], args: List[Tree])(using Context):
diff --git a/compiler/src/dotty/tools/dotc/typer/Applications.scala b/compiler/src/dotty/tools/dotc/typer/Applications.scala
index b8dbfc3786fe..c7565dabdcd2 100644
--- a/compiler/src/dotty/tools/dotc/typer/Applications.scala
+++ b/compiler/src/dotty/tools/dotc/typer/Applications.scala
@@ -25,8 +25,6 @@ import reporting.*
 import Nullables.*, NullOpsDecorator.*
 import config.{Feature, MigrationVersion, SourceVersion}
 import util.Property
-import util.chaining.tap
-
 import collection.mutable
 import config.Printers.{overload, typr, unapp}
 import TypeApplications.*
@@ -38,6 +36,7 @@ import annotation.threadUnsafe
 
 import scala.annotation.tailrec
 import scala.util.control.NonFatal
+import scala.util.chaining.*
 import dotty.tools.dotc.cc.isRetains
 import dotty.tools.dotc.inlines.Inlines
 
diff --git a/compiler/src/dotty/tools/dotc/typer/Typer.scala b/compiler/src/dotty/tools/dotc/typer/Typer.scala
index 80381f42ac1a..b271f5214454 100644
--- a/compiler/src/dotty/tools/dotc/typer/Typer.scala
+++ b/compiler/src/dotty/tools/dotc/typer/Typer.scala
@@ -31,7 +31,6 @@ import EtaExpansion.etaExpand
 import TypeComparer.CompareResult
 import inlines.{Inlines, PrepareInlineable}
 import util.Spans.*
-import util.chaining.*
 import util.common.*
 import util.{Property, SimpleIdentityMap, SrcPos}
 import Applications.{tupleComponentTypes, wrapDefs, defaultArgument}
@@ -53,7 +52,7 @@ import config.MigrationVersion
 import transform.CheckUnused.OriginalName
 
 import scala.annotation.{unchecked as _, *}
-import dotty.tools.dotc.util.chaining.*
+import scala.util.chaining.*
 import dotty.tools.dotc.ast.untpd.Mod
 
 object Typer {
diff --git a/compiler/src/dotty/tools/dotc/util/DotClass.scala b/compiler/src/dotty/tools/dotc/util/DotClass.scala
deleted file mode 100644
index f9e7e97a219d..000000000000
--- a/compiler/src/dotty/tools/dotc/util/DotClass.scala
+++ /dev/null
@@ -1,8 +0,0 @@
-package dotty.tools.dotc.util
-
-/** Adds standard functionality to a class.
- *  For now: Just the `unsupported` method.
- */
-class DotClass {
-
-}
diff --git a/compiler/src/dotty/tools/dotc/util/NameTransformer.scala b/compiler/src/dotty/tools/dotc/util/NameTransformer.scala
deleted file mode 100644
index 1d8ef6150e46..000000000000
--- a/compiler/src/dotty/tools/dotc/util/NameTransformer.scala
+++ /dev/null
@@ -1,150 +0,0 @@
-package dotty.tools
-package dotc
-package util
-
-
-import core.Names.*
-
-import scala.annotation.internal.sharable
-
-/** Provides functions to encode and decode Scala symbolic names.
- */
-object NameTransformer {
-
-  private val nops = 128
-  private val ncodes = 26 * 26
-
-  private class OpCodes(val op: Char, val code: String, val next: OpCodes)
-
-  @sharable private val op2code = new Array[String](nops)
-  @sharable private val code2op = new Array[OpCodes](ncodes)
-  private def enterOp(op: Char, code: String) = {
-    op2code(op.toInt) = code
-    val c = (code.charAt(1) - 'a') * 26 + code.charAt(2) - 'a'
-    code2op(c.toInt) = new OpCodes(op, code, code2op(c))
-  }
-
-  /* Note: decoding assumes opcodes are only ever lowercase. */
-  enterOp('~', "$tilde")
-  enterOp('=', "$eq")
-  enterOp('<', "$less")
-  enterOp('>', "$greater")
-  enterOp('!', "$bang")
-  enterOp('#', "$hash")
-  enterOp('%', "$percent")
-  enterOp('^', "$up")
-  enterOp('&', "$amp")
-  enterOp('|', "$bar")
-  enterOp('*', "$times")
-  enterOp('/', "$div")
-  enterOp('+', "$plus")
-  enterOp('-', "$minus")
-  enterOp(':', "$colon")
-  enterOp('\\', "$bslash")
-  enterOp('?', "$qmark")
-  enterOp('@', "$at")
-
-  /** Replace operator symbols by corresponding expansion strings, and replace
-   *  characters that are not valid Java identifiers by "$u" followed by the
-   *  character's unicode expansion.
-   *  Note that no attempt is made to escape the use of '$' in `name`: blindly
-   *  escaping them might make it impossible to call some platform APIs. This
-   *  unfortunately means that `decode(encode(name))` might not be equal to
-   *  `name`, this is considered acceptable since '$' is a reserved character in
-   *  the Scala spec as well as the Java spec.
-   */
-  def encode(name: SimpleName): SimpleName = {
-    var buf: StringBuilder | Null = null
-    val len = name.length
-    var i = 0
-    while (i < len) {
-      val c = name(i)
-      if (c < nops && (op2code(c.toInt) ne null)) {
-        if (buf eq null) {
-          buf = new StringBuilder()
-          buf.append(name.sliceToString(0, i))
-        }
-        buf.append(op2code(c.toInt))
-      /* Handle glyphs that are not valid Java/JVM identifiers */
-      }
-      else if (!Character.isJavaIdentifierPart(c)) {
-        if (buf eq null) {
-          buf = new StringBuilder()
-          buf.append(name.sliceToString(0, i))
-        }
-        buf.append("$u%04X".format(c.toInt))
-      }
-      else if (buf ne null) {
-        buf.append(c)
-      }
-      i += 1
-    }
-    if (buf eq null) name else termName(buf.toString)
-  }
-
-  /** Replace operator expansions by the operators themselves,
-   *  and decode `$u....` expansions into unicode characters.
-   */
-  def decode(name: SimpleName): SimpleName = {
-    //System.out.println("decode: " + name);//DEBUG
-    var buf: StringBuilder | Null = null
-    val len = name.length
-    var i = 0
-    while (i < len) {
-      var ops: OpCodes | Null = null
-      var unicode = false
-      val c = name(i)
-      if (c == '$' && i + 2 < len) {
-        val ch1 = name(i + 1)
-        if ('a' <= ch1 && ch1 <= 'z') {
-          val ch2 = name(i + 2)
-          if ('a' <= ch2 && ch2 <= 'z') {
-            ops = code2op((ch1 - 'a') * 26 + ch2 - 'a')
-            while ((ops ne null) && !name.startsWith(ops.code, i)) ops = ops.next
-            if (ops ne null) {
-              if (buf eq null) {
-                buf = new StringBuilder()
-                buf.append(name.sliceToString(0, i))
-              }
-              buf.append(ops.op)
-              i += ops.code.length()
-            }
-            /* Handle the decoding of Unicode glyphs that are
-             * not valid Java/JVM identifiers */
-          } else if ((len - i) >= 6 && // Check that there are enough characters left
-                     ch1 == 'u' &&
-                     ((Character.isDigit(ch2)) ||
-                     ('A' <= ch2 && ch2 <= 'F'))) {
-            /* Skip past "$u", next four should be hexadecimal */
-            val hex = name.sliceToString(i+2, i+6)
-            try {
-              val str = Integer.parseInt(hex, 16).toChar
-              if (buf eq null) {
-                buf = new StringBuilder()
-                buf.append(name.sliceToString(0, i))
-              }
-              buf.append(str)
-              /* 2 for "$u", 4 for hexadecimal number */
-              i += 6
-              unicode = true
-            } catch {
-              case _:NumberFormatException =>
-                /* `hex` did not decode to a hexadecimal number, so
-                 * do nothing. */
-            }
-          }
-        }
-      }
-      /* If we didn't see an opcode or encoded Unicode glyph, and the
-        buffer is non-empty, write the current character and advance
-         one */
-      if ((ops eq null) && !unicode) {
-        if (buf ne null)
-          buf.append(c)
-        i += 1
-      }
-    }
-    //System.out.println("= " + (if (buf == null) name else buf.toString()));//DEBUG
-    if (buf eq null) name else termName(buf.toString)
-  }
-}
diff --git a/compiler/src/dotty/tools/dotc/util/ReusableInstance.scala b/compiler/src/dotty/tools/dotc/util/ReusableInstance.scala
index d132940dd03c..d7837d9763fe 100644
--- a/compiler/src/dotty/tools/dotc/util/ReusableInstance.scala
+++ b/compiler/src/dotty/tools/dotc/util/ReusableInstance.scala
@@ -1,7 +1,7 @@
 package dotty.tools.dotc.util
 
 import scala.collection.mutable.ArrayBuffer
-import dotty.tools.dotc.util.chaining.*
+import scala.util.chaining.*
 
 /** A wrapper for a list of cached instances of a type `T`.
   * The wrapper is recursion-reentrant: several instances are kept, so
diff --git a/compiler/src/dotty/tools/dotc/util/SourceFile.scala b/compiler/src/dotty/tools/dotc/util/SourceFile.scala
index 8800743c4f1c..0340e54ca4b9 100644
--- a/compiler/src/dotty/tools/dotc/util/SourceFile.scala
+++ b/compiler/src/dotty/tools/dotc/util/SourceFile.scala
@@ -15,7 +15,7 @@ import scala.annotation.internal.sharable
 import scala.collection.mutable
 import scala.collection.mutable.ArrayBuffer
 import scala.compiletime.uninitialized
-import dotty.tools.dotc.util.chaining.*
+import scala.util.chaining.*
 
 import java.io.File.separator
 import java.net.URI
diff --git a/compiler/src/dotty/tools/dotc/util/chaining.scala b/compiler/src/dotty/tools/dotc/util/chaining.scala
deleted file mode 100644
index 0c61ab6e73e9..000000000000
--- a/compiler/src/dotty/tools/dotc/util/chaining.scala
+++ /dev/null
@@ -1,8 +0,0 @@
-
-package dotty.tools.dotc.util
-
-object chaining:
-
-  extension [A](x: A)
-    inline def tap(inline f: A => Unit): x.type = { f(x): Unit; x }
-    inline def pipe[B](inline f: A => B): B = f(x)
diff --git a/library/src/scala/annotation/unchecked/uncheckedCapabilityLeaks.scala b/library/src/scala/annotation/unchecked/uncheckedCapabilityLeaks.scala
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/repl/src/dotty/tools/repl/ReplCompiler.scala b/repl/src/dotty/tools/repl/ReplCompiler.scala
index f600113df35c..c35fc37acbe9 100644
--- a/repl/src/dotty/tools/repl/ReplCompiler.scala
+++ b/repl/src/dotty/tools/repl/ReplCompiler.scala
@@ -19,11 +19,11 @@ import dotc.typer.TyperPhase
 import dotc.util.Spans.*
 import dotc.util.{ParsedComment, Property, SourceFile}
 import dotc.{CompilationUnit, Compiler, Run}
-import dotc.util.chaining.*
 
 import results.*
 
 import scala.collection.mutable
+import scala.util.chaining.*
 
 /** This subclass of `Compiler` is adapted for use in the REPL.
  *
diff --git a/repl/src/dotty/tools/repl/StackTraceOps.scala b/repl/src/dotty/tools/repl/StackTraceOps.scala
index 618bdd979688..189fc4af092d 100644
--- a/repl/src/dotty/tools/repl/StackTraceOps.scala
+++ b/repl/src/dotty/tools/repl/StackTraceOps.scala
@@ -14,7 +14,7 @@ package dotty.tools.repl
 
 import scala.language.unsafeNulls
 import collection.mutable, mutable.ListBuffer
-import dotty.tools.dotc.util.chaining.*
+import scala.util.chaining.*
 import java.lang.System.lineSeparator
 
 object StackTraceOps: