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,
425 movbe_target_feature,
459 omit_gdb_pretty_printer_section,
466 optin_builtin_traits,
475 overlapping_marker_traits,
480 panic_implementation,
500 poll_with_tls_context,
501 powerpc_target_feature,
502 precise_pointer_size_matching,
506 proc_dash_macro: "proc-macro",
508 proc_macro_attribute,
514 proc_macro_internals,
516 proc_macro_non_items,
517 proc_macro_path_invoc,
521 quad_precision_float,
534 reexport_test_harness_main,
544 re_rebalance_coherence,
560 rustc_allocator_nounwind,
561 rustc_allow_const_fn_ptr,
562 rustc_args_required_const,
566 rustc_const_unstable,
567 rustc_conversion_suggestion,
570 rustc_diagnostic_macros,
573 rustc_dump_env_program_clauses,
574 rustc_dump_program_clauses,
575 rustc_dump_user_substs,
577 rustc_expected_cgu_reuse,
578 rustc_if_this_changed,
579 rustc_inherit_overflow_checks,
581 rustc_layout_scalar_valid_range_end,
582 rustc_layout_scalar_valid_range_start,
583 rustc_macro_transparency,
585 rustc_nonnull_optimization_guaranteed,
586 rustc_object_lifetime_default,
587 rustc_on_unimplemented,
590 rustc_partition_codegened,
591 rustc_partition_reused,
593 rustc_peek_definite_init,
594 rustc_peek_maybe_init,
595 rustc_peek_maybe_uninit,
597 rustc_proc_macro_decls,
601 rustc_std_internal_symbol,
605 rustc_then_this_would_need,
610 rust_eh_unwind_resume,
612 __rust_unstable_column,
613 rvalue_static_promotion,
629 sse4a_target_feature,
642 stmt_expr_attributes,
644 struct_field_attributes,
656 termination_trait_test,
659 test_accepted_feature,
661 test_removed_feature,
681 type_alias_impl_trait,
684 type_alias_enum_variants,
694 underscore_const_names,
696 underscore_lifetimes,
698 universal_impl_trait,
701 unrestricted_attribute_tokens,
704 unsized_tuple_coercion,
719 visible_private_types,
722 warn_directory_ownership,
732 #[derive(Copy, Clone, Eq)]
740 /// Constructs a new identifier from a symbol and a span.
741 pub const fn new(name: Symbol, span: Span) -> Ident {
745 /// Constructs a new identifier with an empty syntax context.
747 pub const fn with_empty_ctxt(name: Symbol) -> Ident {
748 Ident::new(name, DUMMY_SP)
752 pub fn invalid() -> Ident {
753 Ident::with_empty_ctxt(kw::Invalid)
756 /// Maps an interned string to an identifier with an empty syntax context.
757 pub fn from_interned_str(string: InternedString) -> Ident {
758 Ident::with_empty_ctxt(string.as_symbol())
761 /// Maps a string to an identifier with an empty span.
762 pub fn from_str(string: &str) -> Ident {
763 Ident::with_empty_ctxt(Symbol::intern(string))
766 /// Maps a string and a span to an identifier.
767 pub fn from_str_and_span(string: &str, span: Span) -> Ident {
768 Ident::new(Symbol::intern(string), span)
771 /// Replaces `lo` and `hi` with those from `span`, but keep hygiene context.
772 pub fn with_span_pos(self, span: Span) -> Ident {
773 Ident::new(self.name, span.with_ctxt(self.span.ctxt()))
776 pub fn without_first_quote(self) -> Ident {
777 Ident::new(Symbol::intern(self.as_str().trim_start_matches('\'')), self.span)
780 /// "Normalize" ident for use in comparisons using "item hygiene".
781 /// Identifiers with same string value become same if they came from the same "modern" macro
782 /// (e.g., `macro` item, but not `macro_rules` item) and stay different if they came from
783 /// different "modern" macros.
784 /// Technically, this operation strips all non-opaque marks from ident's syntactic context.
785 pub fn modern(self) -> Ident {
786 Ident::new(self.name, self.span.modern())
789 /// "Normalize" ident for use in comparisons using "local variable hygiene".
790 /// Identifiers with same string value become same if they came from the same non-transparent
791 /// macro (e.g., `macro` or `macro_rules!` items) and stay different if they came from different
792 /// non-transparent macros.
793 /// Technically, this operation strips all transparent marks from ident's syntactic context.
794 pub fn modern_and_legacy(self) -> Ident {
795 Ident::new(self.name, self.span.modern_and_legacy())
798 /// Transforms an identifier into one with the same name, but gensymed.
799 pub fn gensym(self) -> Ident {
800 let name = with_interner(|interner| interner.gensymed(self.name));
801 Ident::new(name, self.span)
804 /// Transforms an underscore identifier into one with the same name, but
805 /// gensymed. Leaves non-underscore identifiers unchanged.
806 pub fn gensym_if_underscore(self) -> Ident {
807 if self.name == kw::Underscore { self.gensym() } else { self }
810 // WARNING: this function is deprecated and will be removed in the future.
811 pub fn is_gensymed(self) -> bool {
812 with_interner(|interner| interner.is_gensymed(self.name))
815 pub fn as_str(self) -> LocalInternedString {
819 pub fn as_interned_str(self) -> InternedString {
820 self.name.as_interned_str()
824 impl PartialEq for Ident {
825 fn eq(&self, rhs: &Self) -> bool {
826 self.name == rhs.name && self.span.ctxt() == rhs.span.ctxt()
830 impl Hash for Ident {
831 fn hash<H: Hasher>(&self, state: &mut H) {
832 self.name.hash(state);
833 self.span.ctxt().hash(state);
837 impl fmt::Debug for Ident {
838 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
839 write!(f, "{}{:?}", self.name, self.span.ctxt())
843 impl fmt::Display for Ident {
844 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
845 fmt::Display::fmt(&self.name, f)
849 impl Encodable for Ident {
850 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
851 if self.span.ctxt().modern() == SyntaxContext::empty() {
852 s.emit_str(&self.as_str())
853 } else { // FIXME(jseyfried): intercrate hygiene
854 let mut string = "#".to_owned();
855 string.push_str(&self.as_str());
861 impl Decodable for Ident {
862 fn decode<D: Decoder>(d: &mut D) -> Result<Ident, D::Error> {
863 let string = d.read_str()?;
864 Ok(if !string.starts_with('#') {
865 Ident::from_str(&string)
866 } else { // FIXME(jseyfried): intercrate hygiene
867 Ident::from_str(&string[1..]).gensym()
872 /// A symbol is an interned or gensymed string. A gensym is a symbol that is
873 /// never equal to any other symbol.
875 /// Conceptually, a gensym can be thought of as a normal symbol with an
876 /// invisible unique suffix. Gensyms are useful when creating new identifiers
877 /// that must not match any existing identifiers, e.g. during macro expansion
878 /// and syntax desugaring. Because gensyms should always be identifiers, all
879 /// gensym operations are on `Ident` rather than `Symbol`. (Indeed, in the
880 /// future the gensym-ness may be moved from `Symbol` to hygiene data.)
884 /// assert_eq!(Ident::from_str("x"), Ident::from_str("x"))
885 /// assert_ne!(Ident::from_str("x").gensym(), Ident::from_str("x"))
886 /// assert_ne!(Ident::from_str("x").gensym(), Ident::from_str("x").gensym())
888 /// Internally, a symbol is implemented as an index, and all operations
889 /// (including hashing, equality, and ordering) operate on that index. The use
890 /// of `newtype_index!` means that `Option<Symbol>` only takes up 4 bytes,
891 /// because `newtype_index!` reserves the last 256 values for tagging purposes.
893 /// Note that `Symbol` cannot directly be a `newtype_index!` because it
894 /// implements `fmt::Debug`, `Encodable`, and `Decodable` in special ways.
895 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
896 pub struct Symbol(SymbolIndex);
899 pub struct SymbolIndex { .. }
903 const fn new(n: u32) -> Self {
904 Symbol(SymbolIndex::from_u32_const(n))
907 /// Maps a string to its interned representation.
908 pub fn intern(string: &str) -> Self {
909 with_interner(|interner| interner.intern(string))
912 pub fn as_str(self) -> LocalInternedString {
913 with_interner(|interner| unsafe {
914 LocalInternedString {
915 string: std::mem::transmute::<&str, &str>(interner.get(self))
920 pub fn as_interned_str(self) -> InternedString {
921 with_interner(|interner| InternedString {
922 symbol: interner.interned(self)
926 pub fn as_u32(self) -> u32 {
931 impl fmt::Debug for Symbol {
932 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
933 let is_gensymed = with_interner(|interner| interner.is_gensymed(*self));
935 write!(f, "{}({:?})", self, self.0)
937 write!(f, "{}", self)
942 impl fmt::Display for Symbol {
943 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
944 fmt::Display::fmt(&self.as_str(), f)
948 impl Encodable for Symbol {
949 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
950 s.emit_str(&self.as_str())
954 impl Decodable for Symbol {
955 fn decode<D: Decoder>(d: &mut D) -> Result<Symbol, D::Error> {
956 Ok(Symbol::intern(&d.read_str()?))
960 // The `&'static str`s in this type actually point into the arena.
962 // Note that normal symbols are indexed upward from 0, and gensyms are indexed
963 // downward from SymbolIndex::MAX_AS_U32.
965 pub struct Interner {
966 arena: DroplessArena,
967 names: FxHashMap<&'static str, Symbol>,
968 strings: Vec<&'static str>,
969 gensyms: Vec<Symbol>,
973 fn prefill(init: &[&'static str]) -> Self {
975 strings: init.into(),
976 names: init.iter().copied().zip((0..).map(Symbol::new)).collect(),
981 pub fn intern(&mut self, string: &str) -> Symbol {
982 if let Some(&name) = self.names.get(string) {
986 let name = Symbol::new(self.strings.len() as u32);
988 // `from_utf8_unchecked` is safe since we just allocated a `&str` which is known to be
990 let string: &str = unsafe {
991 str::from_utf8_unchecked(self.arena.alloc_slice(string.as_bytes()))
993 // It is safe to extend the arena allocation to `'static` because we only access
994 // these while the arena is still alive.
995 let string: &'static str = unsafe {
996 &*(string as *const str)
998 self.strings.push(string);
999 self.names.insert(string, name);
1003 fn interned(&self, symbol: Symbol) -> Symbol {
1004 if (symbol.0.as_usize()) < self.strings.len() {
1007 self.gensyms[(SymbolIndex::MAX_AS_U32 - symbol.0.as_u32()) as usize]
1011 fn gensymed(&mut self, symbol: Symbol) -> Symbol {
1012 self.gensyms.push(symbol);
1013 Symbol::new(SymbolIndex::MAX_AS_U32 - self.gensyms.len() as u32 + 1)
1016 fn is_gensymed(&mut self, symbol: Symbol) -> bool {
1017 symbol.0.as_usize() >= self.strings.len()
1020 // Get the symbol as a string. `Symbol::as_str()` should be used in
1021 // preference to this function.
1022 pub fn get(&self, symbol: Symbol) -> &str {
1023 match self.strings.get(symbol.0.as_usize()) {
1024 Some(string) => string,
1026 let symbol = self.gensyms[(SymbolIndex::MAX_AS_U32 - symbol.0.as_u32()) as usize];
1027 self.strings[symbol.0.as_usize()]
1033 // This module has a very short name because it's used a lot.
1039 // This module has a very short name because it's used a lot.
1041 use std::convert::TryInto;
1046 // Get the symbol for an integer. The first few non-negative integers each
1047 // have a static symbol and therefore are fast.
1048 pub fn integer<N: TryInto<usize> + Copy + ToString>(n: N) -> Symbol {
1049 if let Result::Ok(idx) = n.try_into() {
1050 if let Option::Some(&sym) = digits_array.get(idx) {
1054 Symbol::intern(&n.to_string())
1059 fn is_used_keyword_2018(self) -> bool {
1063 fn is_unused_keyword_2018(self) -> bool {
1064 self >= kw::Async && self <= kw::Try
1067 /// Used for sanity checking rustdoc keyword sections.
1068 pub fn is_doc_keyword(self) -> bool {
1072 /// A keyword or reserved identifier that can be used as a path segment.
1073 pub fn is_path_segment_keyword(self) -> bool {
1074 self == kw::Super ||
1075 self == kw::SelfLower ||
1076 self == kw::SelfUpper ||
1077 self == kw::Crate ||
1078 self == kw::PathRoot ||
1079 self == kw::DollarCrate
1082 /// This symbol can be a raw identifier.
1083 pub fn can_be_raw(self) -> bool {
1084 self != kw::Invalid && self != kw::Underscore && !self.is_path_segment_keyword()
1089 // Returns `true` for reserved identifiers used internally for elided lifetimes,
1090 // unnamed method parameters, crate root module, error recovery etc.
1091 pub fn is_special(self) -> bool {
1092 self.name <= kw::Underscore
1095 /// Returns `true` if the token is a keyword used in the language.
1096 pub fn is_used_keyword(self) -> bool {
1097 // Note: `span.edition()` is relatively expensive, don't call it unless necessary.
1098 self.name >= kw::As && self.name <= kw::While ||
1099 self.name.is_used_keyword_2018() && self.span.rust_2018()
1102 /// Returns `true` if the token is a keyword reserved for possible future use.
1103 pub fn is_unused_keyword(self) -> bool {
1104 // Note: `span.edition()` is relatively expensive, don't call it unless necessary.
1105 self.name >= kw::Abstract && self.name <= kw::Yield ||
1106 self.name.is_unused_keyword_2018() && self.span.rust_2018()
1109 /// Returns `true` if the token is either a special identifier or a keyword.
1110 pub fn is_reserved(self) -> bool {
1111 self.is_special() || self.is_used_keyword() || self.is_unused_keyword()
1114 /// A keyword or reserved identifier that can be used as a path segment.
1115 pub fn is_path_segment_keyword(self) -> bool {
1116 self.name.is_path_segment_keyword()
1119 /// We see this identifier in a normal identifier position, like variable name or a type.
1120 /// How was it written originally? Did it use the raw form? Let's try to guess.
1121 pub fn is_raw_guess(self) -> bool {
1122 self.name.can_be_raw() && self.is_reserved()
1126 // If an interner exists, return it. Otherwise, prepare a fresh one.
1128 fn with_interner<T, F: FnOnce(&mut Interner) -> T>(f: F) -> T {
1129 GLOBALS.with(|globals| f(&mut *globals.symbol_interner.lock()))
1132 /// An alternative to `Symbol` and `InternedString`, useful when the chars
1133 /// within the symbol need to be accessed. It is best used for temporary
1136 /// Because the interner outlives any thread which uses this type, we can
1137 /// safely treat `string` which points to interner data, as an immortal string,
1138 /// as long as this type never crosses between threads.
1140 // FIXME: ensure that the interner outlives any thread which uses
1141 // `LocalInternedString`, by creating a new thread right after constructing the
1143 #[derive(Clone, Copy, Hash, PartialOrd, Eq, Ord)]
1144 pub struct LocalInternedString {
1145 string: &'static str,
1148 impl LocalInternedString {
1149 /// Maps a string to its interned representation.
1150 pub fn intern(string: &str) -> Self {
1151 let string = with_interner(|interner| {
1152 let symbol = interner.intern(string);
1153 interner.strings[symbol.0.as_usize()]
1155 LocalInternedString {
1156 string: unsafe { std::mem::transmute::<&str, &str>(string) }
1160 pub fn as_interned_str(self) -> InternedString {
1162 symbol: Symbol::intern(self.string)
1167 pub fn get(&self) -> &str {
1168 // This returns a valid string since we ensure that `self` outlives the interner
1169 // by creating the interner on a thread which outlives threads which can access it.
1170 // This type cannot move to a thread which outlives the interner since it does
1171 // not implement Send.
1176 impl<U: ?Sized> std::convert::AsRef<U> for LocalInternedString
1178 str: std::convert::AsRef<U>
1181 fn as_ref(&self) -> &U {
1182 self.string.as_ref()
1186 impl<T: std::ops::Deref<Target = str>> std::cmp::PartialEq<T> for LocalInternedString {
1187 fn eq(&self, other: &T) -> bool {
1188 self.string == other.deref()
1192 impl std::cmp::PartialEq<LocalInternedString> for str {
1193 fn eq(&self, other: &LocalInternedString) -> bool {
1194 self == other.string
1198 impl<'a> std::cmp::PartialEq<LocalInternedString> for &'a str {
1199 fn eq(&self, other: &LocalInternedString) -> bool {
1200 *self == other.string
1204 impl std::cmp::PartialEq<LocalInternedString> for String {
1205 fn eq(&self, other: &LocalInternedString) -> bool {
1206 self == other.string
1210 impl<'a> std::cmp::PartialEq<LocalInternedString> for &'a String {
1211 fn eq(&self, other: &LocalInternedString) -> bool {
1212 *self == other.string
1216 impl !Send for LocalInternedString {}
1217 impl !Sync for LocalInternedString {}
1219 impl std::ops::Deref for LocalInternedString {
1222 fn deref(&self) -> &str { self.string }
1225 impl fmt::Debug for LocalInternedString {
1226 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1227 fmt::Debug::fmt(self.string, f)
1231 impl fmt::Display for LocalInternedString {
1232 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1233 fmt::Display::fmt(self.string, f)
1237 impl Decodable for LocalInternedString {
1238 fn decode<D: Decoder>(d: &mut D) -> Result<LocalInternedString, D::Error> {
1239 Ok(LocalInternedString::intern(&d.read_str()?))
1243 impl Encodable for LocalInternedString {
1244 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
1245 s.emit_str(self.string)
1249 /// An alternative to `Symbol` that is focused on string contents. It has two
1250 /// main differences to `Symbol`.
1252 /// First, its implementations of `Hash`, `PartialOrd` and `Ord` work with the
1253 /// string chars rather than the symbol integer. This is useful when hash
1254 /// stability is required across compile sessions, or a guaranteed sort
1255 /// ordering is required.
1257 /// Second, gensym-ness is irrelevant. E.g.:
1259 /// assert_ne!(Symbol::gensym("x"), Symbol::gensym("x"))
1260 /// assert_eq!(Symbol::gensym("x").as_interned_str(), Symbol::gensym("x").as_interned_str())
1262 #[derive(Clone, Copy, PartialEq, Eq)]
1263 pub struct InternedString {
1267 impl InternedString {
1268 /// Maps a string to its interned representation.
1269 pub fn intern(string: &str) -> Self {
1271 symbol: Symbol::intern(string)
1275 pub fn with<F: FnOnce(&str) -> R, R>(self, f: F) -> R {
1276 let str = with_interner(|interner| {
1277 interner.get(self.symbol) as *const str
1279 // This is safe because the interner keeps string alive until it is dropped.
1280 // We can access it because we know the interner is still alive since we use a
1281 // scoped thread local to access it, and it was alive at the beginning of this scope
1285 fn with2<F: FnOnce(&str, &str) -> R, R>(self, other: &InternedString, f: F) -> R {
1286 let (self_str, other_str) = with_interner(|interner| {
1287 (interner.get(self.symbol) as *const str,
1288 interner.get(other.symbol) as *const str)
1290 // This is safe for the same reason that `with` is safe.
1291 unsafe { f(&*self_str, &*other_str) }
1294 pub fn as_symbol(self) -> Symbol {
1298 pub fn as_str(self) -> LocalInternedString {
1299 self.symbol.as_str()
1303 impl Hash for InternedString {
1304 fn hash<H: Hasher>(&self, state: &mut H) {
1305 self.with(|str| str.hash(state))
1309 impl PartialOrd<InternedString> for InternedString {
1310 fn partial_cmp(&self, other: &InternedString) -> Option<Ordering> {
1311 if self.symbol == other.symbol {
1312 return Some(Ordering::Equal);
1314 self.with2(other, |self_str, other_str| self_str.partial_cmp(other_str))
1318 impl Ord for InternedString {
1319 fn cmp(&self, other: &InternedString) -> Ordering {
1320 if self.symbol == other.symbol {
1321 return Ordering::Equal;
1323 self.with2(other, |self_str, other_str| self_str.cmp(other_str))
1327 impl fmt::Debug for InternedString {
1328 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1329 self.with(|str| fmt::Debug::fmt(&str, f))
1333 impl fmt::Display for InternedString {
1334 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1335 self.with(|str| fmt::Display::fmt(&str, f))
1339 impl Decodable for InternedString {
1340 fn decode<D: Decoder>(d: &mut D) -> Result<InternedString, D::Error> {
1341 Ok(InternedString::intern(&d.read_str()?))
1345 impl Encodable for InternedString {
1346 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
1347 self.with(|string| s.emit_str(string))