diff --git a/src/librustc_lexer/src/tests.rs b/src/librustc_lexer/src/tests.rs
index e6acc26ec2f34..b0209ac2899d6 100644
--- a/src/librustc_lexer/src/tests.rs
+++ b/src/librustc_lexer/src/tests.rs
@@ -1,137 +1,122 @@
-#[cfg(test)]
-mod tests {
-    use crate::*;
-
-    fn check_raw_str(s: &str, expected_hashes: u16, expected_err: Option<RawStrError>) {
-        let s = &format!("r{}", s);
-        let mut cursor = Cursor::new(s);
-        cursor.bump();
-        let (n_hashes, err) = cursor.raw_double_quoted_string(0);
-        assert_eq!(n_hashes, expected_hashes);
-        assert_eq!(err, expected_err);
-    }
-
-    #[test]
-    fn test_naked_raw_str() {
-        check_raw_str(r#""abc""#, 0, None);
-    }
-
-    #[test]
-    fn test_raw_no_start() {
-        check_raw_str(r##""abc"#"##, 0, None);
-    }
-
-    #[test]
-    fn test_too_many_terminators() {
-        // this error is handled in the parser later
-        check_raw_str(r###"#"abc"##"###, 1, None);
-    }
-
-    #[test]
-    fn test_unterminated() {
-        check_raw_str(
-            r#"#"abc"#,
-            1,
-            Some(RawStrError::NoTerminator {
-                expected: 1,
-                found: 0,
-                possible_terminator_offset: None,
-            }),
-        );
-        check_raw_str(
-            r###"##"abc"#"###,
-            2,
-            Some(RawStrError::NoTerminator {
-                expected: 2,
-                found: 1,
-                possible_terminator_offset: Some(7),
-            }),
-        );
-        // We're looking for "# not just any #
-        check_raw_str(
-            r###"##"abc#"###,
-            2,
-            Some(RawStrError::NoTerminator {
-                expected: 2,
-                found: 0,
-                possible_terminator_offset: None,
-            }),
-        )
-    }
-
-    #[test]
-    fn test_invalid_start() {
-        check_raw_str(r##"#~"abc"#"##, 1, Some(RawStrError::InvalidStarter { bad_char: '~' }));
-    }
-
-    #[test]
-    fn test_unterminated_no_pound() {
-        // https://github.com/rust-lang/rust/issues/70677
-        check_raw_str(
-            r#"""#,
-            0,
-            Some(RawStrError::NoTerminator {
-                expected: 0,
-                found: 0,
-                possible_terminator_offset: None,
-            }),
-        );
-    }
-
-    #[test]
-    fn test_valid_shebang() {
-        // https://github.com/rust-lang/rust/issues/70528
-        let input = "#!/usr/bin/rustrun\nlet x = 5;";
-        assert_eq!(strip_shebang(input), Some(18));
-    }
-
-    #[test]
-    fn test_invalid_shebang_valid_rust_syntax() {
-        // https://github.com/rust-lang/rust/issues/70528
-        let input = "#!    [bad_attribute]";
-        assert_eq!(strip_shebang(input), None);
-    }
-
-    #[test]
-    fn test_shebang_second_line() {
-        // Because shebangs are interpreted by the kernel, they must be on the first line
-        let input = "\n#!/bin/bash";
-        assert_eq!(strip_shebang(input), None);
-    }
-
-    #[test]
-    fn test_shebang_space() {
-        let input = "#!    /bin/bash";
-        assert_eq!(strip_shebang(input), Some(input.len()));
-    }
-
-    #[test]
-    fn test_shebang_empty_shebang() {
-        let input = "#!    \n[attribute(foo)]";
-        assert_eq!(strip_shebang(input), None);
-    }
-
-    #[test]
-    fn test_invalid_shebang_comment() {
-        let input = "#!//bin/ami/a/comment\n[";
-        assert_eq!(strip_shebang(input), None)
-    }
-
-    #[test]
-    fn test_invalid_shebang_another_comment() {
-        let input = "#!/*bin/ami/a/comment*/\n[attribute";
-        assert_eq!(strip_shebang(input), None)
-    }
-
-    #[test]
-    fn test_shebang_valid_rust_after() {
-        let input = "#!/*bin/ami/a/comment*/\npub fn main() {}";
-        assert_eq!(strip_shebang(input), Some(23))
-    }
-
-    #[test]
-    fn test_shebang_followed_by_attrib() {
-        let input = "#!/bin/rust-scripts\n#![allow_unused(true)]";
-        assert_eq!(strip_shebang(input), Some(19));
-    }
+use super::*;
+
+fn check_raw_str(s: &str, expected_hashes: u16, expected_err: Option<RawStrError>) {
+    let s = &format!("r{}", s);
+    let mut cursor = Cursor::new(s);
+    cursor.bump();
+    let (n_hashes, err) = cursor.raw_double_quoted_string(0);
+    assert_eq!(n_hashes, expected_hashes);
+    assert_eq!(err, expected_err);
+}
+
+#[test]
+fn test_naked_raw_str() {
+    check_raw_str(r#""abc""#, 0, None);
+}
+
+#[test]
+fn test_raw_no_start() {
+    check_raw_str(r##""abc"#"##, 0, None);
+}
+
+#[test]
+fn test_too_many_terminators() {
+    // this error is handled in the parser later
+    check_raw_str(r###"#"abc"##"###, 1, None);
+}
+
+#[test]
+fn test_unterminated() {
+    check_raw_str(
+        r#"#"abc"#,
+        1,
+        Some(RawStrError::NoTerminator { expected: 1, found: 0, possible_terminator_offset: None }),
+    );
+    check_raw_str(
+        r###"##"abc"#"###,
+        2,
+        Some(RawStrError::NoTerminator {
+            expected: 2,
+            found: 1,
+            possible_terminator_offset: Some(7),
+        }),
+    );
+    // We're looking for "# not just any #
+    check_raw_str(
+        r###"##"abc#"###,
+        2,
+        Some(RawStrError::NoTerminator { expected: 2, found: 0, possible_terminator_offset: None }),
+    )
+}
+
+#[test]
+fn test_invalid_start() {
+    check_raw_str(r##"#~"abc"#"##, 1, Some(RawStrError::InvalidStarter { bad_char: '~' }));
+}
+
+#[test]
+fn test_unterminated_no_pound() {
+    // https://github.com/rust-lang/rust/issues/70677
+    check_raw_str(
+        r#"""#,
+        0,
+        Some(RawStrError::NoTerminator { expected: 0, found: 0, possible_terminator_offset: None }),
+    );
+}
+
+#[test]
+fn test_valid_shebang() {
+    // https://github.com/rust-lang/rust/issues/70528
+    let input = "#!/usr/bin/rustrun\nlet x = 5;";
+    assert_eq!(strip_shebang(input), Some(18));
+}
+
+#[test]
+fn test_invalid_shebang_valid_rust_syntax() {
+    // https://github.com/rust-lang/rust/issues/70528
+    let input = "#!    [bad_attribute]";
+    assert_eq!(strip_shebang(input), None);
+}
+
+#[test]
+fn test_shebang_second_line() {
+    // Because shebangs are interpreted by the kernel, they must be on the first line
+    let input = "\n#!/bin/bash";
+    assert_eq!(strip_shebang(input), None);
+}
+
+#[test]
+fn test_shebang_space() {
+    let input = "#!    /bin/bash";
+    assert_eq!(strip_shebang(input), Some(input.len()));
+}
+
+#[test]
+fn test_shebang_empty_shebang() {
+    let input = "#!    \n[attribute(foo)]";
+    assert_eq!(strip_shebang(input), None);
+}
+
+#[test]
+fn test_invalid_shebang_comment() {
+    let input = "#!//bin/ami/a/comment\n[";
+    assert_eq!(strip_shebang(input), None)
+}
+
+#[test]
+fn test_invalid_shebang_another_comment() {
+    let input = "#!/*bin/ami/a/comment*/\n[attribute";
+    assert_eq!(strip_shebang(input), None)
+}
+
+#[test]
+fn test_shebang_valid_rust_after() {
+    let input = "#!/*bin/ami/a/comment*/\npub fn main() {}";
+    assert_eq!(strip_shebang(input), Some(23))
+}
+
+#[test]
+fn test_shebang_followed_by_attrib() {
+    let input = "#!/bin/rust-scripts\n#![allow_unused(true)]";
+    assert_eq!(strip_shebang(input), Some(19));
 }