diff --git a/cue/scanner/fuzz.go b/cue/scanner/fuzz.go
deleted file mode 100644
index 3ad29c54e19..00000000000
--- a/cue/scanner/fuzz.go
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2019 CUE Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build gofuzz
-
-package scanner
-
-import (
-	"cuelang.org/go/cue/token"
-)
-
-func Fuzz(b []byte) int {
-	retCode := 1
-	eh := func(_ token.Pos, msg string, args []interface{}) {
-		retCode = 0
-	}
-
-	var s Scanner
-	s.Init(token.NewFile("", -1, len(b)), b, eh, ScanComments)
-
-	for {
-		_, tok, _ := s.Scan()
-		if tok == token.EOF {
-			break
-		}
-	}
-	return retCode
-}
diff --git a/cue/scanner/testdata/corpus/+basic.cue b/cue/scanner/testdata/corpus/+basic.cue
deleted file mode 100644
index fb0e42200b9..00000000000
--- a/cue/scanner/testdata/corpus/+basic.cue
+++ /dev/null
@@ -1,58 +0,0 @@
-/* a comment */
-/*
-*/
-@foo()
-@foo(,,)
-@foo(a)
-@foo(aa=b)
-@foo(,a=b)
-@foo(",a=b")
-@foo(##"\(),a=b"##)
-@foo("",a="")
-_|_
-foobar
-a۰۱۸
-foo६४
-bar９８７６
-ŝ
-ŝfoo
-0
-1
-123456789012345678890
-12345_67890_12345_6788_90
-1234567M
-1234567Mi
-1234567
-.3Mi
-3.3Mi
-0xcafebabe
-0b1100_1001
-0o1234567
-0.
-.0
-3.14159265
-1e0
-1e+100
-1e-100
-2.71828e-1000
-'a'
-'\\000'
-'\\xFF'
-'\\uff16'
-'\\uD801'
-'\\U0000ff16'
-'foobar'
-'foo\/bar'
-#" ""#
-#"foobar"#
-#"\r"#
-#"\("#
-#"\q"#
-###"\##q"###
-"foobar"
-"""
-  foobar
-  """
-#"""
-  \(foobar
-  """#
diff --git a/cue/scanner/testdata/corpus/+comments.cue b/cue/scanner/testdata/corpus/+comments.cue
deleted file mode 100644
index e924b70d6d9..00000000000
--- a/cue/scanner/testdata/corpus/+comments.cue
+++ /dev/null
@@ -1,24 +0,0 @@
-foo //comment
-foo //comment
-foo /*comment*/
-foo /*\n*/
-foo /*comment*/
-foo /*
-*/
-
-foo // comment
-foo /*comment*/
-foo /*
-*/
-foo /*  */ /*
- */, bar /**/
-foo /*0*/ /*1*/ /*2*/
-
-foo /*comment*/
-foo /*0*/ /*1*/ /*2*/
-foo /**/ /*-------------*/ /*----
-*/, bar /*
-baa
-foo    /* an EOF terminates a line */
-foo /* an EOF terminates a line */ /*
-foo    /* an EOF terminates a line */ //
diff --git a/cue/scanner/testdata/corpus/+package.cue b/cue/scanner/testdata/corpus/+package.cue
deleted file mode 100644
index 06ab7d0f9a3..00000000000
--- a/cue/scanner/testdata/corpus/+package.cue
+++ /dev/null
@@ -1 +0,0 @@
-package main
diff --git a/cue/scanner/testdata/corpus/+tokens.cue b/cue/scanner/testdata/corpus/+tokens.cue
deleted file mode 100644
index 66191b0db17..00000000000
--- a/cue/scanner/testdata/corpus/+tokens.cue
+++ /dev/null
@@ -1,49 +0,0 @@
-\ufeff
-,
-foo
-_foo
-123
-1.2
-'x'
-_|_
-"x"
-#'x'#
-	"""
-		foo
-	""
-+-*/%
-&|
-&&
-||
-<-
-->
-==
-<
->
-=
-!
-!=
-<=
->=
-:=
-...
-(
-[
-[[
-{
-{{
-.
-)
-]
-]]
-}
-}}
-:
-;
-true
-false
-null
-for
-if
-let
-in
\ No newline at end of file
diff --git a/cue/scanner/testdata/cue.mod/module.cue b/cue/scanner/testdata/cue.mod/module.cue
deleted file mode 100644
index ac98581306a..00000000000
--- a/cue/scanner/testdata/cue.mod/module.cue
+++ /dev/null
@@ -1 +0,0 @@
-Ensure that CUE files in Go testdata dirs are not part of the CUE module.