diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index 7b5232f1b00965..51ce35c0c9dce4 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -2379,126 +2379,6 @@ func (e *cmdError) ImportPath() string {
 	return e.importPath
 }
 
-// showOutput prints "# desc" followed by the given output.
-// The output is expected to contain references to 'dir', usually
-// the source directory for the package that has failed to build.
-// showOutput rewrites mentions of dir with a relative path to dir
-// when the relative path is shorter. This is usually more pleasant.
-// For example, if fmt doesn't compile and we are in src/html,
-// the output is
-//
-//	$ go build
-//	# fmt
-//	../fmt/print.go:1090: undefined: asdf
-//	$
-//
-// instead of
-//
-//	$ go build
-//	# fmt
-//	/usr/gopher/go/src/fmt/print.go:1090: undefined: asdf
-//	$
-//
-// showOutput also replaces references to the work directory with $WORK.
-//
-// If a is not nil and a.output is not nil, showOutput appends to that slice instead of
-// printing to b.Print.
-func (b *Builder) showOutput(a *Action, dir, desc, out string) {
-	importPath := ""
-	if a != nil && a.Package != nil {
-		importPath = a.Package.ImportPath
-	}
-	psErr := formatOutput(b.WorkDir, dir, importPath, desc, out)
-	if a != nil && a.output != nil {
-		a.output = append(a.output, psErr.prefix...)
-		a.output = append(a.output, psErr.suffix...)
-		return
-	}
-
-	b.output.Lock()
-	defer b.output.Unlock()
-	b.Print(psErr.prefix, psErr.suffix)
-}
-
-// A prefixSuffixError is an error formatted by formatOutput.
-type prefixSuffixError struct {
-	importPath     string
-	prefix, suffix string
-}
-
-func (e *prefixSuffixError) Error() string {
-	if e.importPath != "" && !strings.HasPrefix(strings.TrimPrefix(e.prefix, "# "), e.importPath) {
-		return fmt.Sprintf("go build %s:\n%s%s", e.importPath, e.prefix, e.suffix)
-	}
-	return e.prefix + e.suffix
-}
-
-func (e *prefixSuffixError) ImportPath() string {
-	return e.importPath
-}
-
-// formatOutput prints "# desc" followed by the given output.
-// The output is expected to contain references to 'dir', usually
-// the source directory for the package that has failed to build.
-// formatOutput rewrites mentions of dir with a relative path to dir
-// when the relative path is shorter. This is usually more pleasant.
-// For example, if fmt doesn't compile and we are in src/html,
-// the output is
-//
-//	$ go build
-//	# fmt
-//	../fmt/print.go:1090: undefined: asdf
-//	$
-//
-// instead of
-//
-//	$ go build
-//	# fmt
-//	/usr/gopher/go/src/fmt/print.go:1090: undefined: asdf
-//	$
-//
-// formatOutput also replaces references to the work directory with $WORK.
-// formatOutput returns the output in a prefix with the description and a
-// suffix with the actual output.
-func formatOutput(workDir, dir, importPath, desc, out string) *prefixSuffixError {
-	prefix := "# " + desc
-	suffix := "\n" + out
-
-	suffix = strings.ReplaceAll(suffix, " "+workDir, " $WORK")
-
-	for {
-		// Note that dir starts out long, something like
-		// /foo/bar/baz/root/a
-		// The target string to be reduced is something like
-		// (blah-blah-blah) /foo/bar/baz/root/sibling/whatever.go:blah:blah
-		// /foo/bar/baz/root/a doesn't match /foo/bar/baz/root/sibling, but the prefix
-		// /foo/bar/baz/root does.  And there may be other niblings sharing shorter
-		// prefixes, the only way to find them is to look.
-		// This doesn't always produce a relative path --
-		// /foo is shorter than ../../.., for example.
-		//
-		if reldir := base.ShortPath(dir); reldir != dir {
-			suffix = strings.ReplaceAll(suffix, " "+dir, " "+reldir)
-			suffix = strings.ReplaceAll(suffix, "\n"+dir, "\n"+reldir)
-			suffix = strings.ReplaceAll(suffix, "\n\t"+dir, "\n\t"+reldir)
-			if filepath.Separator == '\\' {
-				// Don't know why, sometimes this comes out with slashes, not backslashes.
-				wdir := strings.ReplaceAll(dir, "\\", "/")
-				suffix = strings.ReplaceAll(suffix, " "+wdir, " "+reldir)
-				suffix = strings.ReplaceAll(suffix, "\n"+wdir, "\n"+reldir)
-				suffix = strings.ReplaceAll(suffix, "\n\t"+wdir, "\n\t"+reldir)
-			}
-		}
-		dirP := filepath.Dir(dir)
-		if dir == dirP {
-			break
-		}
-		dir = dirP
-	}
-
-	return &prefixSuffixError{importPath: importPath, prefix: prefix, suffix: suffix}
-}
-
 var cgoLine = lazyregexp.New(`\[[^\[\]]+\.(cgo1|cover)\.go:[0-9]+(:[0-9]+)?\]`)
 var cgoTypeSigRe = lazyregexp.New(`\b_C2?(type|func|var|macro)_\B`)
 
@@ -2513,23 +2393,6 @@ func (b *Builder) run(a *Action, dir string, desc string, env []string, cmdargs
 	return b.reportCmd(a, nil, desc, dir, out, err)
 }
 
-// processOutput prepares the output of runOut to be output to the console.
-func (b *Builder) processOutput(out []byte) string {
-	if out[len(out)-1] != '\n' {
-		out = append(out, '\n')
-	}
-	messages := string(out)
-	// Fix up output referring to cgo-generated code to be more readable.
-	// Replace x.go:19[/tmp/.../x.cgo1.go:18] with x.go:19.
-	// Replace *[100]_Ctype_foo with *[100]C.foo.
-	// If we're using -x, assume we're debugging and want the full dump, so disable the rewrite.
-	if !cfg.BuildX && cgoLine.MatchString(messages) {
-		messages = cgoLine.ReplaceAllString(messages, "")
-		messages = cgoTypeSigRe.ReplaceAllString(messages, "C.")
-	}
-	return messages
-}
-
 // runOut runs the command given by cmdline in the directory dir.
 // It returns the command output and any errors that occurred.
 // It accumulates execution time in a.