Reformat use declarations.

The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.

compiler/rustc_lexer/src/lib.rs

@@ -31,12 +31,12 @@ pub mod unescape;
 #[cfg(test)]
 mod tests;
 
-pub use crate::cursor::Cursor;
+use unicode_properties::UnicodeEmoji;
 
 use self::LiteralKind::*;
 use self::TokenKind::*;
+pub use crate::cursor::Cursor;
 use crate::cursor::EOF_CHAR;
-use unicode_properties::UnicodeEmoji;
 
 /// Parsed token.
 /// It doesn't contain information about data that has been parsed,

compiler/rustc_lexer/src/tests.rs

@@ -1,7 +1,7 @@
-use super::*;
-
 use expect_test::{expect, Expect};
 
+use super::*;
+
 fn check_raw_str(s: &str, expected: Result<u8, RawStrError>) {
     let s = &format!("r{}", s);
     let mut cursor = Cursor::new(s);