1 //! An "interner" is a data structure that associates values with usize tags and
2 //! allows bidirectional lookup; i.e., given a value, one can easily find the
3 //! type, and vice versa.
5 use arena::DroplessArena;
6 use rustc_data_structures::fx::FxHashMap;
7 use rustc_data_structures::indexed_vec::Idx;
8 use rustc_data_structures::newtype_index;
9 use rustc_macros::symbols;
10 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
12 use std::cmp::{PartialEq, Ordering, PartialOrd, Ord};
14 use std::hash::{Hash, Hasher};
17 use crate::hygiene::SyntaxContext;
18 use crate::{Span, DUMMY_SP, GLOBALS};
24 // After modifying this list adjust `is_special`, `is_used_keyword`/`is_unused_keyword`,
25 // this should be rarely necessary though if the keywords are kept in alphabetic order.
27 // Special reserved identifiers used internally for elided lifetimes,
28 // unnamed method parameters, crate root module, error recovery etc.
31 DollarCrate: "$crate",
34 // Keywords that are used in stable Rust.
71 // Keywords that are used in unstable Rust or reserved for future use.
85 // Edition-specific keywords that are used in stable Rust.
86 Dyn: "dyn", // >= 2018 Edition only
88 // Edition-specific keywords that are used in unstable Rust or reserved for future use.
89 Async: "async", // >= 2018 Edition only
90 Await: "await", // >= 2018 Edition only
91 Try: "try", // >= 2018 Edition only
93 // Special lifetime names
94 UnderscoreLifetime: "'_",
95 StaticLifetime: "'static",
97 // Weak keywords, have special meaning only in specific contexts.
104 // Symbols that can be referred to with syntax_pos::sym::*. The symbol is
105 // the stringified identifier unless otherwise specified (e.g.
106 // `proc_dash_macro` represents "proc-macro").
108 // As well as the symbols listed, there are symbols for the the strings
109 // "0", "1", ..., "9", which are accessible via `sym::integer`.
111 aarch64_target_feature,
114 abi_msp430_interrupt,
122 advanced_slice_patterns,
134 allow_internal_unsafe,
135 allow_internal_unstable,
136 allow_internal_unstable_backcompat_hack,
140 arbitrary_enum_discriminant,
141 arbitrary_self_types,
148 associated_type_bounds,
149 associated_type_defaults,
156 augmented_assignments,
157 automatically_derived,
158 avx512_target_feature,
163 bind_by_move_pattern_guards,
166 borrowck_graphviz_postflow,
167 borrowck_graphviz_preflow,
170 braced_empty_structs,
178 cfg_target_has_atomic,
179 cfg_target_thread_local,
187 closure_to_fn_coercion,
189 cmpxchg16b_target_feature,
196 conservative_impl_trait,
198 const_compare_raw_pointers,
204 const_in_array_repeat_expressions,
208 const_raw_ptr_to_usize_cast,
222 crate_visibility_modifier,
225 custom_inner_attributes,
226 custom_test_frameworks,
233 default_lib_allocator,
234 default_type_parameter_fallback,
249 document_private_items,
250 dotdoteq_in_patterns,
251 dotdot_in_tuple_patterns,
252 double_braced_crate: "{{crate}}",
253 double_braced_impl: "{{impl}}",
254 double_braced_misc: "{{misc}}",
255 double_braced_closure: "{{closure}}",
256 double_braced_constructor: "{{constructor}}",
257 double_braced_constant: "{{constant}}",
258 double_braced_opaque: "{{opaque}}",
260 dropck_parametricity,
275 exclusive_range_pattern,
276 exhaustive_integer_patterns,
282 extern_absolute_paths,
284 extern_crate_item_prelude,
295 field_init_shorthand,
318 generic_associated_types,
327 hexagon_target_feature,
329 homogeneous_aggregate,
343 if_while_or_patterns,
345 impl_header_lifetime_elision,
347 impl_trait_in_bindings,
355 inclusive_range_syntax,
356 infer_outlives_requirements,
357 infer_static_outlives_requirements,
364 irrefutable_let_patterns,
367 issue_5723_bootstrap,
368 issue_tracker_base_url,
388 link_llvm_intrinsics,
397 macro_at_most_once_rep,
400 macro_lifetime_matcher,
401 macro_literal_matcher,
412 match_beginning_vert,
413 match_default_bindings,
426 movbe_target_feature,
460 omit_gdb_pretty_printer_section,
467 optin_builtin_traits,
476 overlapping_marker_traits,
481 panic_implementation,
501 poll_with_tls_context,
502 powerpc_target_feature,
503 precise_pointer_size_matching,
507 proc_dash_macro: "proc-macro",
509 proc_macro_attribute,
515 proc_macro_internals,
517 proc_macro_non_items,
518 proc_macro_path_invoc,
522 quad_precision_float,
535 reexport_test_harness_main,
545 re_rebalance_coherence,
561 rustc_allocator_nounwind,
562 rustc_allow_const_fn_ptr,
563 rustc_args_required_const,
567 rustc_const_unstable,
568 rustc_conversion_suggestion,
571 rustc_diagnostic_macros,
574 rustc_dump_env_program_clauses,
575 rustc_dump_program_clauses,
576 rustc_dump_user_substs,
578 rustc_expected_cgu_reuse,
579 rustc_if_this_changed,
580 rustc_inherit_overflow_checks,
582 rustc_layout_scalar_valid_range_end,
583 rustc_layout_scalar_valid_range_start,
584 rustc_macro_transparency,
586 rustc_nonnull_optimization_guaranteed,
587 rustc_object_lifetime_default,
588 rustc_on_unimplemented,
591 rustc_partition_codegened,
592 rustc_partition_reused,
594 rustc_peek_definite_init,
595 rustc_peek_maybe_init,
596 rustc_peek_maybe_uninit,
598 rustc_proc_macro_decls,
602 rustc_std_internal_symbol,
606 rustc_then_this_would_need,
611 rust_eh_unwind_resume,
613 __rust_unstable_column,
614 rvalue_static_promotion,
630 sse4a_target_feature,
643 stmt_expr_attributes,
645 struct_field_attributes,
657 termination_trait_test,
660 test_accepted_feature,
662 test_removed_feature,
682 type_alias_impl_trait,
685 type_alias_enum_variants,
695 underscore_const_names,
697 underscore_lifetimes,
700 universal_impl_trait,
703 unrestricted_attribute_tokens,
706 unsized_tuple_coercion,
721 visible_private_types,
724 warn_directory_ownership,
735 #[derive(Copy, Clone, Eq)]
743 /// Constructs a new identifier from a symbol and a span.
744 pub const fn new(name: Symbol, span: Span) -> Ident {
748 /// Constructs a new identifier with an empty syntax context.
750 pub const fn with_empty_ctxt(name: Symbol) -> Ident {
751 Ident::new(name, DUMMY_SP)
755 pub fn invalid() -> Ident {
756 Ident::with_empty_ctxt(kw::Invalid)
759 /// Maps an interned string to an identifier with an empty syntax context.
760 pub fn from_interned_str(string: InternedString) -> Ident {
761 Ident::with_empty_ctxt(string.as_symbol())
764 /// Maps a string to an identifier with an empty span.
765 pub fn from_str(string: &str) -> Ident {
766 Ident::with_empty_ctxt(Symbol::intern(string))
769 /// Maps a string and a span to an identifier.
770 pub fn from_str_and_span(string: &str, span: Span) -> Ident {
771 Ident::new(Symbol::intern(string), span)
774 /// Replaces `lo` and `hi` with those from `span`, but keep hygiene context.
775 pub fn with_span_pos(self, span: Span) -> Ident {
776 Ident::new(self.name, span.with_ctxt(self.span.ctxt()))
779 pub fn without_first_quote(self) -> Ident {
780 Ident::new(Symbol::intern(self.as_str().trim_start_matches('\'')), self.span)
783 /// "Normalize" ident for use in comparisons using "item hygiene".
784 /// Identifiers with same string value become same if they came from the same "modern" macro
785 /// (e.g., `macro` item, but not `macro_rules` item) and stay different if they came from
786 /// different "modern" macros.
787 /// Technically, this operation strips all non-opaque marks from ident's syntactic context.
788 pub fn modern(self) -> Ident {
789 Ident::new(self.name, self.span.modern())
792 /// "Normalize" ident for use in comparisons using "local variable hygiene".
793 /// Identifiers with same string value become same if they came from the same non-transparent
794 /// macro (e.g., `macro` or `macro_rules!` items) and stay different if they came from different
795 /// non-transparent macros.
796 /// Technically, this operation strips all transparent marks from ident's syntactic context.
797 pub fn modern_and_legacy(self) -> Ident {
798 Ident::new(self.name, self.span.modern_and_legacy())
801 /// Transforms an identifier into one with the same name, but gensymed.
802 pub fn gensym(self) -> Ident {
803 let name = with_interner(|interner| interner.gensymed(self.name));
804 Ident::new(name, self.span)
807 /// Transforms an underscore identifier into one with the same name, but
808 /// gensymed. Leaves non-underscore identifiers unchanged.
809 pub fn gensym_if_underscore(self) -> Ident {
810 if self.name == kw::Underscore { self.gensym() } else { self }
813 // WARNING: this function is deprecated and will be removed in the future.
814 pub fn is_gensymed(self) -> bool {
815 with_interner(|interner| interner.is_gensymed(self.name))
818 pub fn as_str(self) -> LocalInternedString {
822 pub fn as_interned_str(self) -> InternedString {
823 self.name.as_interned_str()
827 impl PartialEq for Ident {
828 fn eq(&self, rhs: &Self) -> bool {
829 self.name == rhs.name && self.span.ctxt() == rhs.span.ctxt()
833 impl Hash for Ident {
834 fn hash<H: Hasher>(&self, state: &mut H) {
835 self.name.hash(state);
836 self.span.ctxt().hash(state);
840 impl fmt::Debug for Ident {
841 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
842 write!(f, "{}{:?}", self.name, self.span.ctxt())
846 impl fmt::Display for Ident {
847 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
848 fmt::Display::fmt(&self.name, f)
852 impl Encodable for Ident {
853 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
854 if self.span.ctxt().modern() == SyntaxContext::empty() {
855 s.emit_str(&self.as_str())
856 } else { // FIXME(jseyfried): intercrate hygiene
857 let mut string = "#".to_owned();
858 string.push_str(&self.as_str());
864 impl Decodable for Ident {
865 fn decode<D: Decoder>(d: &mut D) -> Result<Ident, D::Error> {
866 let string = d.read_str()?;
867 Ok(if !string.starts_with('#') {
868 Ident::from_str(&string)
869 } else { // FIXME(jseyfried): intercrate hygiene
870 Ident::from_str(&string[1..]).gensym()
875 /// A symbol is an interned or gensymed string. A gensym is a symbol that is
876 /// never equal to any other symbol.
878 /// Conceptually, a gensym can be thought of as a normal symbol with an
879 /// invisible unique suffix. Gensyms are useful when creating new identifiers
880 /// that must not match any existing identifiers, e.g. during macro expansion
881 /// and syntax desugaring. Because gensyms should always be identifiers, all
882 /// gensym operations are on `Ident` rather than `Symbol`. (Indeed, in the
883 /// future the gensym-ness may be moved from `Symbol` to hygiene data.)
887 /// assert_eq!(Ident::from_str("x"), Ident::from_str("x"))
888 /// assert_ne!(Ident::from_str("x").gensym(), Ident::from_str("x"))
889 /// assert_ne!(Ident::from_str("x").gensym(), Ident::from_str("x").gensym())
891 /// Internally, a symbol is implemented as an index, and all operations
892 /// (including hashing, equality, and ordering) operate on that index. The use
893 /// of `newtype_index!` means that `Option<Symbol>` only takes up 4 bytes,
894 /// because `newtype_index!` reserves the last 256 values for tagging purposes.
896 /// Note that `Symbol` cannot directly be a `newtype_index!` because it
897 /// implements `fmt::Debug`, `Encodable`, and `Decodable` in special ways.
898 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
899 pub struct Symbol(SymbolIndex);
902 pub struct SymbolIndex { .. }
906 const fn new(n: u32) -> Self {
907 Symbol(SymbolIndex::from_u32_const(n))
910 /// Maps a string to its interned representation.
911 pub fn intern(string: &str) -> Self {
912 with_interner(|interner| interner.intern(string))
915 pub fn as_str(self) -> LocalInternedString {
916 with_interner(|interner| unsafe {
917 LocalInternedString {
918 string: std::mem::transmute::<&str, &str>(interner.get(self))
923 pub fn as_interned_str(self) -> InternedString {
924 with_interner(|interner| InternedString {
925 symbol: interner.interned(self)
929 pub fn as_u32(self) -> u32 {
934 impl fmt::Debug for Symbol {
935 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
936 let is_gensymed = with_interner(|interner| interner.is_gensymed(*self));
938 write!(f, "{}({:?})", self, self.0)
940 write!(f, "{}", self)
945 impl fmt::Display for Symbol {
946 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
947 fmt::Display::fmt(&self.as_str(), f)
951 impl Encodable for Symbol {
952 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
953 s.emit_str(&self.as_str())
957 impl Decodable for Symbol {
958 fn decode<D: Decoder>(d: &mut D) -> Result<Symbol, D::Error> {
959 Ok(Symbol::intern(&d.read_str()?))
963 // The `&'static str`s in this type actually point into the arena.
965 // Note that normal symbols are indexed upward from 0, and gensyms are indexed
966 // downward from SymbolIndex::MAX_AS_U32.
968 pub struct Interner {
969 arena: DroplessArena,
970 names: FxHashMap<&'static str, Symbol>,
971 strings: Vec<&'static str>,
972 gensyms: Vec<Symbol>,
976 fn prefill(init: &[&'static str]) -> Self {
978 strings: init.into(),
979 names: init.iter().copied().zip((0..).map(Symbol::new)).collect(),
984 pub fn intern(&mut self, string: &str) -> Symbol {
985 if let Some(&name) = self.names.get(string) {
989 let name = Symbol::new(self.strings.len() as u32);
991 // `from_utf8_unchecked` is safe since we just allocated a `&str` which is known to be
993 let string: &str = unsafe {
994 str::from_utf8_unchecked(self.arena.alloc_slice(string.as_bytes()))
996 // It is safe to extend the arena allocation to `'static` because we only access
997 // these while the arena is still alive.
998 let string: &'static str = unsafe {
999 &*(string as *const str)
1001 self.strings.push(string);
1002 self.names.insert(string, name);
1006 fn interned(&self, symbol: Symbol) -> Symbol {
1007 if (symbol.0.as_usize()) < self.strings.len() {
1010 self.gensyms[(SymbolIndex::MAX_AS_U32 - symbol.0.as_u32()) as usize]
1014 fn gensymed(&mut self, symbol: Symbol) -> Symbol {
1015 self.gensyms.push(symbol);
1016 Symbol::new(SymbolIndex::MAX_AS_U32 - self.gensyms.len() as u32 + 1)
1019 fn is_gensymed(&mut self, symbol: Symbol) -> bool {
1020 symbol.0.as_usize() >= self.strings.len()
1023 // Get the symbol as a string. `Symbol::as_str()` should be used in
1024 // preference to this function.
1025 pub fn get(&self, symbol: Symbol) -> &str {
1026 match self.strings.get(symbol.0.as_usize()) {
1027 Some(string) => string,
1029 let symbol = self.gensyms[(SymbolIndex::MAX_AS_U32 - symbol.0.as_u32()) as usize];
1030 self.strings[symbol.0.as_usize()]
1036 // This module has a very short name because it's used a lot.
1042 // This module has a very short name because it's used a lot.
1044 use std::convert::TryInto;
1049 // Get the symbol for an integer. The first few non-negative integers each
1050 // have a static symbol and therefore are fast.
1051 pub fn integer<N: TryInto<usize> + Copy + ToString>(n: N) -> Symbol {
1052 if let Result::Ok(idx) = n.try_into() {
1053 if let Option::Some(&sym) = digits_array.get(idx) {
1057 Symbol::intern(&n.to_string())
1062 fn is_used_keyword_2018(self) -> bool {
1066 fn is_unused_keyword_2018(self) -> bool {
1067 self >= kw::Async && self <= kw::Try
1070 /// Used for sanity checking rustdoc keyword sections.
1071 pub fn is_doc_keyword(self) -> bool {
1075 /// A keyword or reserved identifier that can be used as a path segment.
1076 pub fn is_path_segment_keyword(self) -> bool {
1077 self == kw::Super ||
1078 self == kw::SelfLower ||
1079 self == kw::SelfUpper ||
1080 self == kw::Crate ||
1081 self == kw::PathRoot ||
1082 self == kw::DollarCrate
1085 /// This symbol can be a raw identifier.
1086 pub fn can_be_raw(self) -> bool {
1087 self != kw::Invalid && self != kw::Underscore && !self.is_path_segment_keyword()
1092 // Returns `true` for reserved identifiers used internally for elided lifetimes,
1093 // unnamed method parameters, crate root module, error recovery etc.
1094 pub fn is_special(self) -> bool {
1095 self.name <= kw::Underscore
1098 /// Returns `true` if the token is a keyword used in the language.
1099 pub fn is_used_keyword(self) -> bool {
1100 // Note: `span.edition()` is relatively expensive, don't call it unless necessary.
1101 self.name >= kw::As && self.name <= kw::While ||
1102 self.name.is_used_keyword_2018() && self.span.rust_2018()
1105 /// Returns `true` if the token is a keyword reserved for possible future use.
1106 pub fn is_unused_keyword(self) -> bool {
1107 // Note: `span.edition()` is relatively expensive, don't call it unless necessary.
1108 self.name >= kw::Abstract && self.name <= kw::Yield ||
1109 self.name.is_unused_keyword_2018() && self.span.rust_2018()
1112 /// Returns `true` if the token is either a special identifier or a keyword.
1113 pub fn is_reserved(self) -> bool {
1114 self.is_special() || self.is_used_keyword() || self.is_unused_keyword()
1117 /// A keyword or reserved identifier that can be used as a path segment.
1118 pub fn is_path_segment_keyword(self) -> bool {
1119 self.name.is_path_segment_keyword()
1122 /// We see this identifier in a normal identifier position, like variable name or a type.
1123 /// How was it written originally? Did it use the raw form? Let's try to guess.
1124 pub fn is_raw_guess(self) -> bool {
1125 self.name.can_be_raw() && self.is_reserved()
1129 // If an interner exists, return it. Otherwise, prepare a fresh one.
1131 fn with_interner<T, F: FnOnce(&mut Interner) -> T>(f: F) -> T {
1132 GLOBALS.with(|globals| f(&mut *globals.symbol_interner.lock()))
1135 /// An alternative to `Symbol` and `InternedString`, useful when the chars
1136 /// within the symbol need to be accessed. It is best used for temporary
1139 /// Because the interner outlives any thread which uses this type, we can
1140 /// safely treat `string` which points to interner data, as an immortal string,
1141 /// as long as this type never crosses between threads.
1143 // FIXME: ensure that the interner outlives any thread which uses
1144 // `LocalInternedString`, by creating a new thread right after constructing the
1146 #[derive(Clone, Copy, Hash, PartialOrd, Eq, Ord)]
1147 pub struct LocalInternedString {
1148 string: &'static str,
1151 impl LocalInternedString {
1152 /// Maps a string to its interned representation.
1153 pub fn intern(string: &str) -> Self {
1154 let string = with_interner(|interner| {
1155 let symbol = interner.intern(string);
1156 interner.strings[symbol.0.as_usize()]
1158 LocalInternedString {
1159 string: unsafe { std::mem::transmute::<&str, &str>(string) }
1163 pub fn as_interned_str(self) -> InternedString {
1165 symbol: Symbol::intern(self.string)
1170 pub fn get(&self) -> &str {
1171 // This returns a valid string since we ensure that `self` outlives the interner
1172 // by creating the interner on a thread which outlives threads which can access it.
1173 // This type cannot move to a thread which outlives the interner since it does
1174 // not implement Send.
1179 impl<U: ?Sized> std::convert::AsRef<U> for LocalInternedString
1181 str: std::convert::AsRef<U>
1184 fn as_ref(&self) -> &U {
1185 self.string.as_ref()
1189 impl<T: std::ops::Deref<Target = str>> std::cmp::PartialEq<T> for LocalInternedString {
1190 fn eq(&self, other: &T) -> bool {
1191 self.string == other.deref()
1195 impl std::cmp::PartialEq<LocalInternedString> for str {
1196 fn eq(&self, other: &LocalInternedString) -> bool {
1197 self == other.string
1201 impl<'a> std::cmp::PartialEq<LocalInternedString> for &'a str {
1202 fn eq(&self, other: &LocalInternedString) -> bool {
1203 *self == other.string
1207 impl std::cmp::PartialEq<LocalInternedString> for String {
1208 fn eq(&self, other: &LocalInternedString) -> bool {
1209 self == other.string
1213 impl<'a> std::cmp::PartialEq<LocalInternedString> for &'a String {
1214 fn eq(&self, other: &LocalInternedString) -> bool {
1215 *self == other.string
1219 impl !Send for LocalInternedString {}
1220 impl !Sync for LocalInternedString {}
1222 impl std::ops::Deref for LocalInternedString {
1225 fn deref(&self) -> &str { self.string }
1228 impl fmt::Debug for LocalInternedString {
1229 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1230 fmt::Debug::fmt(self.string, f)
1234 impl fmt::Display for LocalInternedString {
1235 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1236 fmt::Display::fmt(self.string, f)
1240 impl Decodable for LocalInternedString {
1241 fn decode<D: Decoder>(d: &mut D) -> Result<LocalInternedString, D::Error> {
1242 Ok(LocalInternedString::intern(&d.read_str()?))
1246 impl Encodable for LocalInternedString {
1247 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
1248 s.emit_str(self.string)
1252 /// An alternative to `Symbol` that is focused on string contents. It has two
1253 /// main differences to `Symbol`.
1255 /// First, its implementations of `Hash`, `PartialOrd` and `Ord` work with the
1256 /// string chars rather than the symbol integer. This is useful when hash
1257 /// stability is required across compile sessions, or a guaranteed sort
1258 /// ordering is required.
1260 /// Second, gensym-ness is irrelevant. E.g.:
1262 /// assert_ne!(Symbol::gensym("x"), Symbol::gensym("x"))
1263 /// assert_eq!(Symbol::gensym("x").as_interned_str(), Symbol::gensym("x").as_interned_str())
1265 #[derive(Clone, Copy, PartialEq, Eq)]
1266 pub struct InternedString {
1270 impl InternedString {
1271 /// Maps a string to its interned representation.
1272 pub fn intern(string: &str) -> Self {
1274 symbol: Symbol::intern(string)
1278 pub fn with<F: FnOnce(&str) -> R, R>(self, f: F) -> R {
1279 let str = with_interner(|interner| {
1280 interner.get(self.symbol) as *const str
1282 // This is safe because the interner keeps string alive until it is dropped.
1283 // We can access it because we know the interner is still alive since we use a
1284 // scoped thread local to access it, and it was alive at the beginning of this scope
1288 fn with2<F: FnOnce(&str, &str) -> R, R>(self, other: &InternedString, f: F) -> R {
1289 let (self_str, other_str) = with_interner(|interner| {
1290 (interner.get(self.symbol) as *const str,
1291 interner.get(other.symbol) as *const str)
1293 // This is safe for the same reason that `with` is safe.
1294 unsafe { f(&*self_str, &*other_str) }
1297 pub fn as_symbol(self) -> Symbol {
1301 pub fn as_str(self) -> LocalInternedString {
1302 self.symbol.as_str()
1306 impl Hash for InternedString {
1307 fn hash<H: Hasher>(&self, state: &mut H) {
1308 self.with(|str| str.hash(state))
1312 impl PartialOrd<InternedString> for InternedString {
1313 fn partial_cmp(&self, other: &InternedString) -> Option<Ordering> {
1314 if self.symbol == other.symbol {
1315 return Some(Ordering::Equal);
1317 self.with2(other, |self_str, other_str| self_str.partial_cmp(other_str))
1321 impl Ord for InternedString {
1322 fn cmp(&self, other: &InternedString) -> Ordering {
1323 if self.symbol == other.symbol {
1324 return Ordering::Equal;
1326 self.with2(other, |self_str, other_str| self_str.cmp(other_str))
1330 impl fmt::Debug for InternedString {
1331 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1332 self.with(|str| fmt::Debug::fmt(&str, f))
1336 impl fmt::Display for InternedString {
1337 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1338 self.with(|str| fmt::Display::fmt(&str, f))
1342 impl Decodable for InternedString {
1343 fn decode<D: Decoder>(d: &mut D) -> Result<InternedString, D::Error> {
1344 Ok(InternedString::intern(&d.read_str()?))
1348 impl Encodable for InternedString {
1349 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
1350 self.with(|string| s.emit_str(string))