feat: allow multiple suggestions for malformed crate_type attribute

Author: Blindspot22

compiler/rustc_builtin_macros/src/cfg_accessible.rs

@@ -4,8 +4,7 @@ use rustc_ast as ast;
 use rustc_expand::base::{Annotatable, ExpandResult, ExtCtxt, Indeterminate, MultiItemModifier};
 use rustc_feature::AttributeTemplate;
 use rustc_parse::validate_attr;
-use rustc_span::symbol::sym;
-use rustc_span::Span;
+use rustc_span::{Span, sym};
 
 use crate::errors;
 
@@ -45,9 +44,9 @@ impl MultiItemModifier for Expander {
         item: Annotatable,
         _is_derive_const: bool,
     ) -> ExpandResult<Vec<Annotatable>, Annotatable> {
-        let template = AttributeTemplate { list: Some("path"), ..Default::default() };
+        let template = AttributeTemplate { list: Some(&["path"]), ..Default::default() };
+
         validate_attr::check_builtin_meta_item(
-            &ecx.ecfg.features,
             &ecx.sess.psess,
             meta_item,
             ast::AttrStyle::Outer,

compiler/rustc_builtin_macros/src/derive.rs

@@ -1,13 +1,12 @@
 use rustc_ast as ast;
-use rustc_ast::{GenericParamKind, ItemKind, MetaItemKind, NestedMetaItem, StmtKind};
+use rustc_ast::{GenericParamKind, ItemKind, MetaItemInner, MetaItemKind, StmtKind};
 use rustc_expand::base::{
     Annotatable, DeriveResolution, ExpandResult, ExtCtxt, Indeterminate, MultiItemModifier,
 };
 use rustc_feature::AttributeTemplate;
 use rustc_parse::validate_attr;
 use rustc_session::Session;
-use rustc_span::symbol::{sym, Ident};
-use rustc_span::{ErrorGuaranteed, Span};
+use rustc_span::{ErrorGuaranteed, Ident, Span, sym};
 
 use crate::cfg_eval::cfg_eval;
 use crate::errors;
@@ -35,10 +34,11 @@ impl MultiItemModifier for Expander {
         let (sess, features) = (ecx.sess, ecx.ecfg.features);
         let result =
             ecx.resolver.resolve_derives(ecx.current_expansion.id, ecx.force_mode, &|| {
-                let template =
-                    AttributeTemplate { list: Some("Trait1, Trait2, ..."), ..Default::default() };
+                let template = AttributeTemplate {
+                    list: Some(&["Trait1", "Trait2", "..."]),
+                    ..Default::default()
+                };
                 validate_attr::check_builtin_meta_item(
-                    features,
                     &sess.psess,
                     meta_item,
                     ast::AttrStyle::Outer,
@@ -50,9 +50,9 @@ impl MultiItemModifier for Expander {
                 let mut resolutions = match &meta_item.kind {
                     MetaItemKind::List(list) => {
                         list.iter()
-                            .filter_map(|nested_meta| match nested_meta {
-                                NestedMetaItem::MetaItem(meta) => Some(meta),
-                                NestedMetaItem::Lit(lit) => {
+                            .filter_map(|meta_item_inner| match meta_item_inner {
+                                MetaItemInner::MetaItem(meta) => Some(meta),
+                                MetaItemInner::Lit(lit) => {
                                     // Reject `#[derive("Debug")]`.
                                     report_unexpected_meta_item_lit(sess, lit);
                                     None

compiler/rustc_feature/src/builtin_attrs.rs

@@ -3,22 +3,19 @@
 use rustc_ast::token::Delimiter;
 use rustc_ast::tokenstream::DelimSpan;
 use rustc_ast::{
-    self as ast, AttrArgs, AttrArgsEq, Attribute, DelimArgs, MetaItem, MetaItemKind,
-    NestedMetaItem, Safety,
+    self as ast, AttrArgs, Attribute, DelimArgs, MetaItem, MetaItemInner, MetaItemKind, Safety,
 };
 use rustc_errors::{Applicability, FatalError, PResult};
-use rustc_feature::{
-    AttributeSafety, AttributeTemplate, BuiltinAttribute, Features, BUILTIN_ATTRIBUTE_MAP,
-};
+use rustc_feature::{AttributeSafety, AttributeTemplate, BUILTIN_ATTRIBUTE_MAP, BuiltinAttribute};
 use rustc_session::errors::report_lit_error;
-use rustc_session::lint::builtin::{ILL_FORMED_ATTRIBUTE_INPUT, UNSAFE_ATTR_OUTSIDE_UNSAFE};
 use rustc_session::lint::BuiltinLintDiag;
+use rustc_session::lint::builtin::{ILL_FORMED_ATTRIBUTE_INPUT, UNSAFE_ATTR_OUTSIDE_UNSAFE};
 use rustc_session::parse::ParseSess;
-use rustc_span::{sym, BytePos, Span, Symbol};
+use rustc_span::{Span, Symbol, sym};
 
 use crate::{errors, parse_in};
 
-pub fn check_attr(features: &Features, psess: &ParseSess, attr: &Attribute) {
+pub fn check_attr(psess: &ParseSess, attr: &Attribute) {
     if attr.is_doc_comment() {
         return;
     }
@@ -28,24 +25,24 @@ pub fn check_attr(features: &Features, psess: &ParseSess, attr: &Attribute) {
 
     // All non-builtin attributes are considered safe
     let safety = attr_info.map(|x| x.safety).unwrap_or(AttributeSafety::Normal);
-    check_attribute_safety(features, psess, safety, attr);
+    check_attribute_safety(psess, safety, attr);
 
     // Check input tokens for built-in and key-value attributes.
     match attr_info {
         // `rustc_dummy` doesn't have any restrictions specific to built-in attributes.
         Some(BuiltinAttribute { name, template, .. }) if *name != sym::rustc_dummy => {
             match parse_meta(psess, attr) {
                 // Don't check safety again, we just did that
-                Ok(meta) => check_builtin_meta_item(
-                    features, psess, &meta, attr.style, *name, *template, false,
-                ),
+                Ok(meta) => {
+                    check_builtin_meta_item(psess, &meta, attr.style, *name, *template, false)
+                }
                 Err(err) => {
                     err.emit();
                 }
             }
         }
         _ => {
-            if let AttrArgs::Eq(..) = attr_item.args {
+            if let AttrArgs::Eq { .. } = attr_item.args {
                 // All key-value attributes are restricted to meta-item syntax.
                 match parse_meta(psess, attr) {
                     Ok(_) => {}
@@ -72,7 +69,7 @@ pub fn parse_meta<'a>(psess: &'a ParseSess, attr: &Attribute) -> PResult<'a, Met
                     parse_in(psess, tokens.clone(), "meta list", |p| p.parse_meta_seq_top())?;
                 MetaItemKind::List(nmis)
             }
-            AttrArgs::Eq(_, AttrArgsEq::Ast(expr)) => {
+            AttrArgs::Eq { expr, .. } => {
                 if let ast::ExprKind::Lit(token_lit) = expr.kind {
                     let res = ast::MetaItemLit::from_token_lit(token_lit, expr.span);
                     let res = match res {
@@ -118,7 +115,6 @@ pub fn parse_meta<'a>(psess: &'a ParseSess, attr: &Attribute) -> PResult<'a, Met
                     return Err(err);
                 }
             }
-            AttrArgs::Eq(_, AttrArgsEq::Hir(lit)) => MetaItemKind::NameValue(lit.clone()),
         },
     })
 }
@@ -145,7 +141,7 @@ pub(super) fn check_cfg_attr_bad_delim(psess: &ParseSess, span: DelimSpan, delim
 
 /// Checks that the given meta-item is compatible with this `AttributeTemplate`.
 fn is_attr_template_compatible(template: &AttributeTemplate, meta: &ast::MetaItemKind) -> bool {
-    let is_one_allowed_subword = |items: &[NestedMetaItem]| match items {
+    let is_one_allowed_subword = |items: &[MetaItemInner]| match items {
         [item] => item.is_word() && template.one_of.iter().any(|&word| item.has_name(word)),
         _ => false,
     };
@@ -157,16 +153,7 @@ fn is_attr_template_compatible(template: &AttributeTemplate, meta: &ast::MetaIte
     }
 }
 
-pub fn check_attribute_safety(
-    features: &Features,
-    psess: &ParseSess,
-    safety: AttributeSafety,
-    attr: &Attribute,
-) {
-    if !features.unsafe_attributes {
-        return;
-    }
-
+pub fn check_attribute_safety(psess: &ParseSess, safety: AttributeSafety, attr: &Attribute) {
     let attr_item = attr.get_normal_item();
 
     if safety == AttributeSafety::Unsafe {
@@ -177,11 +164,7 @@ pub fn check_attribute_safety(
             // wrapping it in `unsafe(...)`. Otherwise, we suggest putting the
             // `unsafe(`, `)` right after and right before the opening and closing
             // square bracket respectively.
-            let diag_span = if attr_item.span().can_be_used_for_suggestions() {
-                attr_item.span()
-            } else {
-                attr.span.with_lo(attr.span.lo() + BytePos(2)).with_hi(attr.span.hi() - BytePos(1))
-            };
+            let diag_span = attr_item.span();
 
             if attr.span.at_least_rust_2024() {
                 psess.dcx().emit_err(errors::UnsafeAttrOutsideUnsafe {
@@ -203,33 +186,28 @@ pub fn check_attribute_safety(
                 );
             }
         }
-    } else {
-        if let Safety::Unsafe(unsafe_span) = attr_item.unsafety {
-            psess.dcx().emit_err(errors::InvalidAttrUnsafe {
-                span: unsafe_span,
-                name: attr_item.path.clone(),
-            });
-        }
+    } else if let Safety::Unsafe(unsafe_span) = attr_item.unsafety {
+        psess.dcx().emit_err(errors::InvalidAttrUnsafe {
+            span: unsafe_span,
+            name: attr_item.path.clone(),
+        });
     }
 }
 
 // Called by `check_builtin_meta_item` and code that manually denies
 // `unsafe(...)` in `cfg`
-pub fn deny_builtin_meta_unsafety(features: &Features, psess: &ParseSess, meta: &MetaItem) {
+pub fn deny_builtin_meta_unsafety(psess: &ParseSess, meta: &MetaItem) {
     // This only supports denying unsafety right now - making builtin attributes
     // support unsafety will requite us to thread the actual `Attribute` through
     // for the nice diagnostics.
-    if features.unsafe_attributes {
-        if let Safety::Unsafe(unsafe_span) = meta.unsafety {
-            psess
-                .dcx()
-                .emit_err(errors::InvalidAttrUnsafe { span: unsafe_span, name: meta.path.clone() });
-        }
+    if let Safety::Unsafe(unsafe_span) = meta.unsafety {
+        psess
+            .dcx()
+            .emit_err(errors::InvalidAttrUnsafe { span: unsafe_span, name: meta.path.clone() });
     }
 }
 
 pub fn check_builtin_meta_item(
-    features: &Features,
     psess: &ParseSess,
     meta: &MetaItem,
     style: ast::AttrStyle,
@@ -246,7 +224,7 @@ pub fn check_builtin_meta_item(
     }
 
     if deny_unsafety {
-        deny_builtin_meta_unsafety(features, psess, meta);
+        deny_builtin_meta_unsafety(psess, meta);
     }
 }
 
@@ -270,7 +248,8 @@ fn emit_malformed_attribute(
         suggestions.push(format!("#{inner}[{name}]"));
     }
     if let Some(descr) = template.list {
-        suggestions.push(format!("#{inner}[{name}({descr})]"));
+        let descr_formatted = descr.join(", ");
+        suggestions.push(format!("#{inner}[{name}({descr_formatted})]"));
     }
     suggestions.extend(template.one_of.iter().map(|&word| format!("#{inner}[{name}({word})]")));
     if let Some(descr) = template.name_value_str {

compiler/rustc_parse/src/validate_attr.rs

@@ -23,7 +23,7 @@ pub struct BuiltinAttribute {
 #[derive(Clone, Copy)]
 pub struct AttributeTemplate {
     pub word: bool,
-    pub list: Option<&'static str>,
+    pub list: Option<&'static [&'static str]>,
     pub name_value_str: Option<&'static str>,
 }
 
@@ -464,6 +464,9 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
     // Used by the `rustc::potential_query_instability` lint to warn methods which
     // might not be stable during incremental compilation.
     rustc_attr!(rustc_lint_query_instability, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE),
+    // Used by the `rustc::untracked_query_information` lint to warn methods which
+    // might break incremental compilation.
+    rustc_attr!(rustc_lint_untracked_query_information, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE),
     // Used by the `rustc::untranslatable_diagnostic` and `rustc::diagnostic_outside_of_impl` lints
     // to assist in changes to diagnostic APIs.
     rustc_attr!(rustc_lint_diagnostics, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE),
@@ -629,6 +632,19 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
         rustc_safe_intrinsic, Normal, template!(Word), WarnFollowing,
         "the `#[rustc_safe_intrinsic]` attribute is used internally to mark intrinsics as safe"
     ),
+    rustc_attr!(
+        rustc_intrinsic, Normal, template!(Word), ErrorFollowing,
+        "the `#[rustc_intrinsic]` attribute is used to declare intrinsics with function bodies",
+    ),
+    rustc_attr!(
+        rustc_no_mir_inline, Normal, template!(Word), WarnFollowing,
+        "#[rustc_no_mir_inline] prevents the MIR inliner from inlining a function while not affecting codegen"
+    ),
+    rustc_attr!(
+        rustc_intrinsic_must_be_overridden, Normal, template!(Word), ErrorFollowing,
+        "the `#[rustc_intrinsic_must_be_overridden]` attribute is used to declare intrinsics without real bodies",
+    ),
+
     rustc_attr!(
         rustc_deprecated_safe_2024, Normal, template!(Word), WarnFollowing,
         "the `#[rustc_safe_intrinsic]` marks functions as unsafe in Rust 2024",
@@ -679,7 +695,6 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
         template!(List: r#"cfg = "...", module = "...", kind = "...""#), DuplicatesOk,
     ),
     rustc_attr!(TEST, rustc_symbol_name, Normal, template!(Word), WarnFollowing),
-    rustc_attr!(TEST, rustc_polymorphize_error, Normal, template!(Word), WarnFollowing),
     rustc_attr!(TEST, rustc_def_path, Normal, template!(Word), WarnFollowing),
     rustc_attr!(TEST, rustc_mir, Normal, template!(List: "arg1, arg2, ..."), DuplicatesOk),
     gated!(