Make it clearer that edition functions are >=, not ==

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -1200,7 +1200,7 @@ fn check_matcher_core<'tt>(
                             err.span_label(sp, format!("not allowed after `{}` fragments", kind));
 
                             if kind == NonterminalKind::PatWithOr
-                                && sess.edition.rust_2021()
+                                && sess.edition.at_least_rust_2021()
                                 && next_token.is_token(&BinOp(token::BinOpToken::Or))
                             {
                                 let suggestion = quoted_tt_to_string(&TokenTree::MetaVarDecl(

compiler/rustc_hir_analysis/src/astconv/lint.rs

@@ -86,7 +86,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 ));
             }
 
-            if self_ty.span.edition().rust_2021() {
+            if self_ty.span.edition().at_least_rust_2021() {
                 let msg = "trait objects must include the `dyn` keyword";
                 let label = "add `dyn` keyword before this trait";
                 let mut diag =

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -860,7 +860,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .resolve_fully_qualified_call(span, item_name, ty.normalized, qself.span, hir_id)
             .and_then(|r| {
                 // lint bare trait if the method is found in the trait
-                if span.edition().rust_2021() && let Some(mut diag) = self.tcx.sess.diagnostic().steal_diagnostic(qself.span, StashKey::TraitMissingMethod) {
+                if span.edition().at_least_rust_2021() && let Some(mut diag) = self.tcx.sess.diagnostic().steal_diagnostic(qself.span, StashKey::TraitMissingMethod) {
                     diag.emit();
                 }
                 Ok(r)
@@ -890,7 +890,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
 
                 // emit or cancel the diagnostic for bare traits
-                if span.edition().rust_2021() && let Some(mut diag) = self.tcx.sess.diagnostic().steal_diagnostic(qself.span, StashKey::TraitMissingMethod) {
+                if span.edition().at_least_rust_2021() && let Some(mut diag) = self.tcx.sess.diagnostic().steal_diagnostic(qself.span, StashKey::TraitMissingMethod) {
                     if trait_missing_method {
                         // cancel the diag for bare traits when meeting `MyTrait::missing_method`
                         diag.cancel();
@@ -908,7 +908,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         error,
                         None,
                         Expectation::NoExpectation,
-                        trait_missing_method && span.edition().rust_2021(), // emits missing method for trait only after edition 2021
+                        trait_missing_method && span.edition().at_least_rust_2021(), // emits missing method for trait only after edition 2021
                     ) {
                         e.emit();
                     }

compiler/rustc_hir_typeck/src/method/prelude2021.rs

@@ -32,7 +32,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         );
 
         // Rust 2021 and later is already using the new prelude
-        if span.rust_2021() {
+        if span.at_least_rust_2021() {
             return;
         }
 
@@ -203,7 +203,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         pick: &Pick<'tcx>,
     ) {
         // Rust 2021 and later is already using the new prelude
-        if span.rust_2021() {
+        if span.at_least_rust_2021() {
             return;
         }
 

compiler/rustc_hir_typeck/src/method/probe.rs

@@ -437,7 +437,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 // this case used to be allowed by the compiler,
                 // so we do a future-compat lint here for the 2015 edition
                 // (see https://github.com/rust-lang/rust/issues/46906)
-                if self.tcx.sess.rust_2018() {
+                if self.tcx.sess.at_least_rust_2018() {
                     self.tcx.sess.emit_err(MethodCallOnUnknownRawPointee { span });
                 } else {
                     self.tcx.struct_span_lint_hir(
@@ -1592,7 +1592,7 @@ impl<'a, 'tcx> ProbeContext<'a, 'tcx> {
                     if let Some(method_name) = self.method_name {
                         // Some trait methods are excluded for arrays before 2021.
                         // (`array.into_iter()` wants a slice iterator for compatibility.)
-                        if self_ty.is_array() && !method_name.span.rust_2021() {
+                        if self_ty.is_array() && !method_name.span.at_least_rust_2021() {
                             let trait_def = self.tcx.trait_def(trait_ref.def_id);
                             if trait_def.skip_array_during_method_dispatch {
                                 return ProbeResult::NoMatch;

compiler/rustc_hir_typeck/src/upvar.rs

@@ -2001,7 +2001,7 @@ fn should_do_rust_2021_incompatible_closure_captures_analysis(
     tcx: TyCtxt<'_>,
     closure_id: hir::HirId,
 ) -> bool {
-    if tcx.sess.rust_2021() {
+    if tcx.sess.at_least_rust_2021() {
         return false;
     }
 
@@ -2247,5 +2247,5 @@ fn truncate_capture_for_optimization(
 fn enable_precise_capture(span: Span) -> bool {
     // We use span here to ensure that if the closure was generated by a macro with a different
     // edition.
-    span.rust_2021()
+    span.at_least_rust_2021()
 }

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -1932,7 +1932,7 @@ impl<'tcx> Printer<'tcx> for FmtPrinter<'_, 'tcx> {
     fn path_crate(mut self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {
         self.empty_path = true;
         if cnum == LOCAL_CRATE {
-            if self.tcx.sess.rust_2018() {
+            if self.tcx.sess.at_least_rust_2018() {
                 // We add the `crate::` keyword on Rust 2018, only when desired.
                 if SHOULD_PREFIX_WITH_CRATE.with(|flag| flag.get()) {
                     write!(self, "{}", kw::Crate)?;

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -730,5 +730,5 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
 
 /// Precise capture is enabled if user is using Rust Edition 2021 or higher.
 fn enable_precise_capture(closure_span: Span) -> bool {
-    closure_span.rust_2021()
+    closure_span.at_least_rust_2021()
 }

compiler/rustc_parse/src/parser/expr.rs

@@ -1309,7 +1309,7 @@ impl<'a> Parser<'a> {
 
     /// Assuming we have just parsed `.`, continue parsing into an expression.
     fn parse_dot_suffix(&mut self, self_arg: P<Expr>, lo: Span) -> PResult<'a, P<Expr>> {
-        if self.token.uninterpolated_span().rust_2018() && self.eat_keyword(kw::Await) {
+        if self.token.uninterpolated_span().at_least_rust_2018() && self.eat_keyword(kw::Await) {
             return Ok(self.mk_await_expr(self_arg, lo));
         }
 
@@ -1442,8 +1442,8 @@ impl<'a> Parser<'a> {
             self.parse_expr_let()
         } else if self.eat_keyword(kw::Underscore) {
             Ok(self.mk_expr(self.prev_token.span, ExprKind::Underscore))
-        } else if self.token.uninterpolated_span().rust_2018() {
-            // `Span::rust_2018()` is somewhat expensive; don't get it repeatedly.
+        } else if self.token.uninterpolated_span().at_least_rust_2018() {
+            // `Span:.at_least_rust_2018()` is somewhat expensive; don't get it repeatedly.
             if self.check_keyword(kw::Async) {
                 if self.is_async_block() {
                     // Check for `async {` and `async move {`.
@@ -2230,7 +2230,7 @@ impl<'a> Parser<'a> {
         let movability =
             if self.eat_keyword(kw::Static) { Movability::Static } else { Movability::Movable };
 
-        let asyncness = if self.token.uninterpolated_span().rust_2018() {
+        let asyncness = if self.token.uninterpolated_span().at_least_rust_2018() {
             self.parse_asyncness(Case::Sensitive)
         } else {
             Async::No
@@ -3014,7 +3014,7 @@ impl<'a> Parser<'a> {
     fn is_try_block(&self) -> bool {
         self.token.is_keyword(kw::Try)
             && self.look_ahead(1, |t| *t == token::OpenDelim(Delimiter::Brace))
-            && self.token.uninterpolated_span().rust_2018()
+            && self.token.uninterpolated_span().at_least_rust_2018()
     }
 
     /// Parses an `async move? {...}` expression.

compiler/rustc_parse/src/parser/ty.rs

@@ -608,7 +608,7 @@ impl<'a> Parser<'a> {
     /// Is a `dyn B0 + ... + Bn` type allowed here?
     fn is_explicit_dyn_type(&mut self) -> bool {
         self.check_keyword(kw::Dyn)
-            && (self.token.uninterpolated_span().rust_2018()
+            && (self.token.uninterpolated_span().at_least_rust_2018()
                 || self.look_ahead(1, |t| {
                     (t.can_begin_bound() || t.kind == TokenKind::BinOp(token::Star))
                         && !can_continue_type_after_non_fn_ident(t)

compiler/rustc_resolve/src/check_unused.rs

@@ -440,7 +440,7 @@ impl Resolver<'_, '_> {
 
             // If we are not in Rust 2018 edition, then we don't make any further
             // suggestions.
-            if !tcx.sess.rust_2018() {
+            if !tcx.sess.at_least_rust_2018() {
                 continue;
             }
 

compiler/rustc_resolve/src/diagnostics.rs

@@ -1203,7 +1203,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                     if filter_fn(res) {
                         // create the path
                         let mut segms = path_segments.clone();
-                        if lookup_ident.span.rust_2018() {
+                        if lookup_ident.span.at_least_rust_2018() {
                             // crate-local absolute paths start with `crate::` in edition 2018
                             // FIXME: may also be stabilized for Rust 2015 (Issues #45477, #44660)
                             segms.insert(0, ast::PathSegment::from_ident(crate_name));
@@ -1268,7 +1268,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                     path_segments.push(ast::PathSegment::from_ident(ident));
 
                     let is_extern_crate_that_also_appears_in_prelude =
-                        name_binding.is_extern_crate() && lookup_ident.span.rust_2018();
+                        name_binding.is_extern_crate() && lookup_ident.span.at_least_rust_2018();
 
                     if !is_extern_crate_that_also_appears_in_prelude {
                         // add the module to the lookup
@@ -1315,7 +1315,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             &filter_fn,
         );
 
-        if lookup_ident.span.rust_2018() {
+        if lookup_ident.span.at_least_rust_2018() {
             let extern_prelude_names = self.extern_prelude.clone();
             for (ident, _) in extern_prelude_names.into_iter() {
                 if ident.span.from_expansion() {
@@ -1568,7 +1568,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                     "consider adding an explicit import of `{ident}` to disambiguate"
                 ))
             }
-            if b.is_extern_crate() && ident.span.rust_2018() {
+            if b.is_extern_crate() && ident.span.at_least_rust_2018() {
                 help_msgs.push(format!("use `::{ident}` to refer to this {thing} unambiguously"))
             }
             match misc {
@@ -1973,7 +1973,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                 if fst.ident.name == kw::PathRoot && !snd.ident.is_path_segment_keyword() => {}
             // `ident::...` on 2018.
             (Some(fst), _)
-                if fst.ident.span.rust_2018() && !fst.ident.is_path_segment_keyword() =>
+                if fst.ident.span.at_least_rust_2018() && !fst.ident.is_path_segment_keyword() =>
             {
                 // Insert a placeholder that's later replaced by `self`/`super`/etc.
                 path.insert(0, Segment::from_ident(Ident::empty()));

compiler/rustc_resolve/src/ident.rs

@@ -1417,13 +1417,13 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                         ));
                         continue;
                     }
-                    if name == kw::PathRoot && ident.span.rust_2018() {
+                    if name == kw::PathRoot && ident.span.at_least_rust_2018() {
                         module = Some(ModuleOrUniformRoot::ExternPrelude);
                         continue;
                     }
                     if name == kw::PathRoot
                         && ident.span.is_rust_2015()
-                        && self.tcx.sess.rust_2018()
+                        && self.tcx.sess.at_least_rust_2018()
                     {
                         // `::a::b` from 2015 macro on 2018 global edition
                         module = Some(ModuleOrUniformRoot::CrateRootAndExternPrelude);

compiler/rustc_session/src/session.rs

@@ -995,18 +995,18 @@ impl Session {
     }
 
     /// Are we allowed to use features from the Rust 2018 edition?
-    pub fn rust_2018(&self) -> bool {
-        self.edition().rust_2018()
+    pub fn at_least_rust_2018(&self) -> bool {
+        self.edition().at_least_rust_2018()
     }
 
     /// Are we allowed to use features from the Rust 2021 edition?
-    pub fn rust_2021(&self) -> bool {
-        self.edition().rust_2021()
+    pub fn at_least_rust_2021(&self) -> bool {
+        self.edition().at_least_rust_2021()
     }
 
     /// Are we allowed to use features from the Rust 2024 edition?
-    pub fn rust_2024(&self) -> bool {
-        self.edition().rust_2024()
+    pub fn at_least_rust_2024(&self) -> bool {
+        self.edition().at_least_rust_2024()
     }
 
     /// Returns `true` if we should use the PLT for shared library calls.

compiler/rustc_span/src/edition.rs

@@ -82,17 +82,17 @@ impl Edition {
     }
 
     /// Are we allowed to use features from the Rust 2018 edition?
-    pub fn rust_2018(self) -> bool {
+    pub fn at_least_rust_2018(self) -> bool {
         self >= Edition::Edition2018
     }
 
     /// Are we allowed to use features from the Rust 2021 edition?
-    pub fn rust_2021(self) -> bool {
+    pub fn at_least_rust_2021(self) -> bool {
         self >= Edition::Edition2021
     }
 
     /// Are we allowed to use features from the Rust 2024 edition?
-    pub fn rust_2024(self) -> bool {
+    pub fn at_least_rust_2024(self) -> bool {
         self >= Edition::Edition2024
     }
 }

compiler/rustc_span/src/lib.rs

@@ -707,24 +707,28 @@ impl Span {
         self.ctxt().edition()
     }
 
+    /// Is this edition 2015?
     #[inline]
     pub fn is_rust_2015(self) -> bool {
         self.edition().is_rust_2015()
     }
 
+    /// Are we allowed to use features from the Rust 2018 edition?
     #[inline]
-    pub fn rust_2018(self) -> bool {
-        self.edition().rust_2018()
+    pub fn at_least_rust_2018(self) -> bool {
+        self.edition().at_least_rust_2018()
     }
 
+    /// Are we allowed to use features from the Rust 2021 edition?
     #[inline]
-    pub fn rust_2021(self) -> bool {
-        self.edition().rust_2021()
+    pub fn at_least_rust_2021(self) -> bool {
+        self.edition().at_least_rust_2021()
     }
 
+    /// Are we allowed to use features from the Rust 2024 edition?
     #[inline]
-    pub fn rust_2024(self) -> bool {
-        self.edition().rust_2024()
+    pub fn at_least_rust_2024(self) -> bool {
+        self.edition().at_least_rust_2024()
     }
 
     /// Returns the source callee.