Rollup of 6 pull requests

Cargo.lock

@@ -64,9 +64,9 @@ dependencies = [
 
 [[package]]
 name = "annotate-snippets"
-version = "0.12.15"
+version = "0.12.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92570a3f9c98e7e84df84b71d0965ac99b1871fcd75a3773a3bd1bad13f64cf7"
+checksum = "f211a51805bc641f3ad5b7664c77d2547af685cc33b4cd8d31964027a46f13f1"
 dependencies = [
  "anstyle",
  "memchr",
@@ -3958,7 +3958,7 @@ dependencies = [
 name = "rustc_errors"
 version = "0.0.0"
 dependencies = [
- "annotate-snippets 0.12.15",
+ "annotate-snippets 0.12.16",
  "anstream",
  "anstyle",
  "derive_setters",

compiler/rustc_attr_parsing/src/parser.rs

@@ -30,8 +30,8 @@ use thin_vec::ThinVec;
 
 use crate::ShouldEmit;
 use crate::session_diagnostics::{
-    InvalidMetaItem, InvalidMetaItemQuoteIdentSugg, InvalidMetaItemRemoveNegSugg, MetaBadDelim,
-    MetaBadDelimSugg, SuffixedLiteralInAttribute,
+    ExpectedComma, InvalidMetaItem, InvalidMetaItemQuoteIdentSugg, InvalidMetaItemRemoveNegSugg,
+    MetaBadDelim, MetaBadDelimSugg, SuffixedLiteralInAttribute,
 };
 
 #[derive(Clone, Debug)]
@@ -704,6 +704,29 @@ impl<'a, 'sess> MetaItemListParserContext<'a, 'sess> {
         self.parser.dcx().create_err(err)
     }
 
+    fn should_continue_parsing_meta_items(&mut self) -> Result<bool, Diag<'sess>> {
+        if self.parser.eat(exp!(Comma)) {
+            return Ok(true);
+        } else if self.parser.token == token::Eof {
+            return Ok(false);
+        }
+
+        let mut snapshot = self.parser.create_snapshot_for_diagnostic();
+        if matches!(self.should_emit, ShouldEmit::ErrorsAndLints { recovery: Recovery::Allowed }) {
+            let span = self.parser.prev_token.span.shrink_to_hi();
+            self.should_emit = ShouldEmit::Nothing;
+            match self.parse_meta_item_inner() {
+                Ok(_) => {
+                    return Err(self.parser.dcx().create_err(ExpectedComma { span }));
+                }
+                Err(e) => {
+                    e.cancel();
+                }
+            }
+        }
+        snapshot.unexpected_any()
+    }
+
     fn parse(
         tokens: TokenStream,
         psess: &'sess ParseSess,
@@ -724,15 +747,11 @@ impl<'a, 'sess> MetaItemListParserContext<'a, 'sess> {
         while this.parser.token != token::Eof {
             sub_parsers.push(this.parse_meta_item_inner()?);
 
-            if !this.parser.eat(exp!(Comma)) {
+            if !this.should_continue_parsing_meta_items()? {
                 break;
             }
         }
 
-        if parser.token != token::Eof {
-            parser.unexpected()?;
-        }
-
         Ok(MetaItemListParser { sub_parsers, span })
     }
 }

compiler/rustc_attr_parsing/src/session_diagnostics.rs

@@ -1032,3 +1032,16 @@ pub(crate) struct SanitizeInvalidStatic {
     pub span: Span,
     pub field: &'static str,
 }
+
+#[derive(Diagnostic)]
+#[diag("attribute items not separated with `,`")]
+pub(crate) struct ExpectedComma {
+    #[primary_span]
+    #[suggestion(
+        "try adding `,` here",
+        code = ",",
+        applicability = "maybe-incorrect",
+        style = "short"
+    )]
+    pub span: Span,
+}

compiler/rustc_errors/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2024"
 
 [dependencies]
 # tidy-alphabetical-start
-annotate-snippets = { version = "0.12.15", features = ["simd"] }
+annotate-snippets = { version = "0.12.16", features = ["simd"] }
 anstream = "0.6.20"
 anstyle = "1.0.13"
 derive_setters = "0.1.6"