Rename 'bad prefix' to 'unknown prefix'.

compiler/rustc_lexer/src/lib.rs

@@ -72,7 +72,7 @@ pub enum TokenKind {
     /// prefixes are reported as errors; in earlier editions, they result in a
     /// (allowed by default) lint, and are treated as regular identifier
     /// tokens.
-    BadPrefix,
+    UnknownPrefix,
     /// "12_u8", "1.0e-40", "b"123"". See `LiteralKind` for more details.
     Literal { kind: LiteralKind, suffix_start: usize },
     /// "'a"
@@ -330,7 +330,7 @@ impl Cursor<'_> {
                     let kind = RawStr { n_hashes, err };
                     Literal { kind, suffix_start }
                 }
-                _ => self.ident_or_bad_prefix(),
+                _ => self.ident_or_unknown_prefix(),
             },
 
             // Byte literal, byte string literal, raw byte string literal or identifier.
@@ -365,12 +365,12 @@ impl Cursor<'_> {
                     let kind = RawByteStr { n_hashes, err };
                     Literal { kind, suffix_start }
                 }
-                _ => self.ident_or_bad_prefix(),
+                _ => self.ident_or_unknown_prefix(),
             },
 
             // Identifier (this should be checked after other variant that can
             // start as identifier).
-            c if is_id_start(c) => self.ident_or_bad_prefix(),
+            c if is_id_start(c) => self.ident_or_unknown_prefix(),
 
             // Numeric literal.
             c @ '0'..='9' => {
@@ -494,14 +494,14 @@ impl Cursor<'_> {
         RawIdent
     }
 
-    fn ident_or_bad_prefix(&mut self) -> TokenKind {
+    fn ident_or_unknown_prefix(&mut self) -> TokenKind {
         debug_assert!(is_id_start(self.prev()));
         // Start is already eaten, eat the rest of identifier.
         self.eat_while(is_id_continue);
-        // Good prefixes must have been handled earlier. So if
-        // we see a prefix here, it is definitely a bad prefix.
+        // Known prefixes must have been handled earlier. So if
+        // we see a prefix here, it is definitely a unknown prefix.
         match self.first() {
-            '#' | '"' | '\'' => BadPrefix,
+            '#' | '"' | '\'' => UnknownPrefix,
             _ => Ident,
         }
     }

compiler/rustc_parse/src/lexer/mod.rs

@@ -170,15 +170,15 @@ impl<'a> StringReader<'a> {
             rustc_lexer::TokenKind::Whitespace => return None,
             rustc_lexer::TokenKind::Ident
             | rustc_lexer::TokenKind::RawIdent
-            | rustc_lexer::TokenKind::BadPrefix => {
+            | rustc_lexer::TokenKind::UnknownPrefix => {
                 let is_raw_ident = token == rustc_lexer::TokenKind::RawIdent;
-                let is_bad_prefix = token == rustc_lexer::TokenKind::BadPrefix;
+                let is_unknown_prefix = token == rustc_lexer::TokenKind::UnknownPrefix;
                 let mut ident_start = start;
                 if is_raw_ident {
                     ident_start = ident_start + BytePos(2);
                 }
-                if is_bad_prefix {
-                    self.report_reserved_prefix(start);
+                if is_unknown_prefix {
+                    self.report_unknown_prefix(start);
                 }
                 let sym = nfc_normalize(self.str_from(ident_start));
                 let span = self.mk_sp(start, self.pos);
@@ -503,7 +503,7 @@ impl<'a> StringReader<'a> {
     // using a (unknown) prefix is an error. In earlier editions, however, they
     // only result in a (allowed by default) lint, and are treated as regular
     // identifier tokens.
-    fn report_reserved_prefix(&self, start: BytePos) {
+    fn report_unknown_prefix(&self, start: BytePos) {
         let prefix_span = self.mk_sp(start, self.pos);
         let msg = format!("prefix `{}` is unknown", self.str_from_to(start, self.pos));
 

src/librustdoc/html/highlight.rs

@@ -413,7 +413,7 @@ impl<'a> Classifier<'a> {
                 },
                 c => c,
             },
-            TokenKind::RawIdent | TokenKind::BadPrefix => Class::Ident,
+            TokenKind::RawIdent | TokenKind::UnknownPrefix => Class::Ident,
             TokenKind::Lifetime { .. } => Class::Lifetime,
         };
         // Anything that didn't return above is the simple case where we the