Rollup of 6 pull requests

compiler/rustc_ast_passes/messages.ftl

@@ -269,6 +269,9 @@ ast_passes_unsafe_negative_impl = negative impls cannot be unsafe
     .negative = negative because of this
     .unsafe = unsafe because of this
 
+ast_passes_unsafe_static =
+    static items cannot be declared with `unsafe` safety qualifier outside of `extern` block
+
 ast_passes_visibility_not_permitted =
     visibility qualifiers are not permitted here
     .enum_variant = enum variants and their fields always share the visibility of the enum they are in

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -438,6 +438,11 @@ impl<'a> AstValidator<'a> {
         }
     }
 
+    /// This ensures that items can only be `unsafe` (or unmarked) outside of extern
+    /// blocks.
+    ///
+    /// This additionally ensures that within extern blocks, items can only be
+    /// `safe`/`unsafe` inside of a `unsafe`-adorned extern block.
     fn check_item_safety(&self, span: Span, safety: Safety) {
         match self.extern_mod_safety {
             Some(extern_safety) => {
@@ -1177,6 +1182,9 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
             }
             ItemKind::Static(box StaticItem { expr, safety, .. }) => {
                 self.check_item_safety(item.span, *safety);
+                if matches!(safety, Safety::Unsafe(_)) {
+                    self.dcx().emit_err(errors::UnsafeStatic { span: item.span });
+                }
 
                 if expr.is_none() {
                     self.dcx().emit_err(errors::StaticWithoutBody {

compiler/rustc_ast_passes/src/errors.rs

@@ -224,6 +224,13 @@ pub struct InvalidSafetyOnBareFn {
     pub span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(ast_passes_unsafe_static)]
+pub struct UnsafeStatic {
+    #[primary_span]
+    pub span: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(ast_passes_bound_in_context)]
 pub struct BoundInContext<'a> {

compiler/rustc_builtin_macros/src/cmdline_attrs.rs

@@ -4,6 +4,7 @@ use crate::errors;
 use rustc_ast::attr::mk_attr;
 use rustc_ast::token;
 use rustc_ast::{self as ast, AttrItem, AttrStyle};
+use rustc_parse::parser::ForceCollect;
 use rustc_parse::{new_parser_from_source_str, unwrap_or_emit_fatal};
 use rustc_session::parse::ParseSess;
 use rustc_span::FileName;
@@ -17,13 +18,14 @@ pub fn inject(krate: &mut ast::Crate, psess: &ParseSess, attrs: &[String]) {
         ));
 
         let start_span = parser.token.span;
-        let AttrItem { unsafety, path, args, tokens: _ } = match parser.parse_attr_item(false) {
-            Ok(ai) => ai,
-            Err(err) => {
-                err.emit();
-                continue;
-            }
-        };
+        let AttrItem { unsafety, path, args, tokens: _ } =
+            match parser.parse_attr_item(ForceCollect::No) {
+                Ok(ai) => ai,
+                Err(err) => {
+                    err.emit();
+                    continue;
+                }
+            };
         let end_span = parser.token.span;
         if parser.token != token::Eof {
             psess.dcx().emit_err(errors::InvalidCrateAttr { span: start_span.to(end_span) });

compiler/rustc_parse/messages.ftl

@@ -524,6 +524,8 @@ parse_mismatched_closing_delimiter = mismatched closing delimiter: `{$delimiter}
     .label_opening_candidate = closing delimiter possibly meant for this
     .label_unclosed = unclosed delimiter
 
+parse_misplaced_return_type = place the return type after the function parameters
+
 parse_missing_comma_after_match_arm = expected `,` following `match` arm
     .suggestion = missing a comma here to end this `match` arm
 

compiler/rustc_parse/src/errors.rs

@@ -1502,6 +1502,20 @@ pub(crate) struct FnPtrWithGenerics {
     pub sugg: Option<FnPtrWithGenericsSugg>,
 }
 
+#[derive(Subdiagnostic)]
+#[multipart_suggestion(
+    parse_misplaced_return_type,
+    style = "verbose",
+    applicability = "maybe-incorrect"
+)]
+pub(crate) struct MisplacedReturnType {
+    #[suggestion_part(code = " {snippet}")]
+    pub fn_params_end: Span,
+    pub snippet: String,
+    #[suggestion_part(code = "")]
+    pub ret_ty_span: Span,
+}
+
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(parse_suggestion, applicability = "maybe-incorrect")]
 pub(crate) struct FnPtrWithGenericsSugg {
@@ -1516,7 +1530,6 @@ pub(crate) struct FnPtrWithGenericsSugg {
 
 pub(crate) struct FnTraitMissingParen {
     pub span: Span,
-    pub machine_applicable: bool,
 }
 
 impl Subdiagnostic for FnTraitMissingParen {
@@ -1526,16 +1539,11 @@ impl Subdiagnostic for FnTraitMissingParen {
         _: &F,
     ) {
         diag.span_label(self.span, crate::fluent_generated::parse_fn_trait_missing_paren);
-        let applicability = if self.machine_applicable {
-            Applicability::MachineApplicable
-        } else {
-            Applicability::MaybeIncorrect
-        };
         diag.span_suggestion_short(
             self.span.shrink_to_hi(),
             crate::fluent_generated::parse_add_paren,
             "()",
-            applicability,
+            Applicability::MachineApplicable,
         );
     }
 }

compiler/rustc_parse/src/parser/attr.rs

@@ -124,7 +124,7 @@ impl<'a> Parser<'a> {
                 if this.eat(&token::Not) { ast::AttrStyle::Inner } else { ast::AttrStyle::Outer };
 
             this.expect(&token::OpenDelim(Delimiter::Bracket))?;
-            let item = this.parse_attr_item(false)?;
+            let item = this.parse_attr_item(ForceCollect::No)?;
             this.expect(&token::CloseDelim(Delimiter::Bracket))?;
             let attr_sp = lo.to(this.prev_token.span);
 
@@ -248,16 +248,15 @@ impl<'a> Parser<'a> {
     ///     PATH
     ///     PATH `=` UNSUFFIXED_LIT
     /// The delimiters or `=` are still put into the resulting token stream.
-    pub fn parse_attr_item(&mut self, capture_tokens: bool) -> PResult<'a, ast::AttrItem> {
+    pub fn parse_attr_item(&mut self, force_collect: ForceCollect) -> PResult<'a, ast::AttrItem> {
         maybe_whole!(self, NtMeta, |attr| attr.into_inner());
 
-        let do_parse = |this: &mut Self| {
+        let do_parse = |this: &mut Self, _empty_attrs| {
             let is_unsafe = this.eat_keyword(kw::Unsafe);
             let unsafety = if is_unsafe {
                 let unsafe_span = this.prev_token.span;
                 this.psess.gated_spans.gate(sym::unsafe_attributes, unsafe_span);
                 this.expect(&token::OpenDelim(Delimiter::Parenthesis))?;
-
                 ast::Safety::Unsafe(unsafe_span)
             } else {
                 ast::Safety::Default
@@ -268,10 +267,10 @@ impl<'a> Parser<'a> {
             if is_unsafe {
                 this.expect(&token::CloseDelim(Delimiter::Parenthesis))?;
             }
-            Ok(ast::AttrItem { unsafety, path, args, tokens: None })
+            Ok((ast::AttrItem { unsafety, path, args, tokens: None }, false))
         };
-        // Attr items don't have attributes
-        if capture_tokens { self.collect_tokens_no_attrs(do_parse) } else { do_parse(self) }
+        // Attr items don't have attributes.
+        self.collect_tokens_trailing_token(AttrWrapper::empty(), force_collect, do_parse)
     }
 
     /// Parses attributes that appear after the opening of an item. These should
@@ -344,7 +343,7 @@ impl<'a> Parser<'a> {
         let mut expanded_attrs = Vec::with_capacity(1);
         while self.token.kind != token::Eof {
             let lo = self.token.span;
-            let item = self.parse_attr_item(true)?;
+            let item = self.parse_attr_item(ForceCollect::Yes)?;
             expanded_attrs.push((item, lo.to(self.prev_token.span)));
             if !self.eat(&token::Comma) {
                 break;

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -430,7 +430,7 @@ impl<'a> Parser<'a> {
         &mut self,
         edible: &[TokenKind],
         inedible: &[TokenKind],
-    ) -> PResult<'a, Recovered> {
+    ) -> PResult<'a, ErrorGuaranteed> {
         debug!("expected_one_of_not_found(edible: {:?}, inedible: {:?})", edible, inedible);
         fn tokens_to_string(tokens: &[TokenType]) -> String {
             let mut i = tokens.iter();
@@ -533,7 +533,7 @@ impl<'a> Parser<'a> {
                     sugg: ExpectedSemiSugg::ChangeToSemi(self.token.span),
                 });
                 self.bump();
-                return Ok(Recovered::Yes(guar));
+                return Ok(guar);
             } else if self.look_ahead(0, |t| {
                 t == &token::CloseDelim(Delimiter::Brace)
                     || ((t.can_begin_expr() || t.can_begin_item())
@@ -557,7 +557,7 @@ impl<'a> Parser<'a> {
                     unexpected_token_label: Some(self.token.span),
                     sugg: ExpectedSemiSugg::AddSemi(span),
                 });
-                return Ok(Recovered::Yes(guar));
+                return Ok(guar);
             }
         }
 
@@ -712,7 +712,7 @@ impl<'a> Parser<'a> {
         if self.check_too_many_raw_str_terminators(&mut err) {
             if expected.contains(&TokenType::Token(token::Semi)) && self.eat(&token::Semi) {
                 let guar = err.emit();
-                return Ok(Recovered::Yes(guar));
+                return Ok(guar);
             } else {
                 return Err(err);
             }

compiler/rustc_parse/src/parser/item.rs

@@ -17,6 +17,7 @@ use rustc_span::edit_distance::edit_distance;
 use rustc_span::edition::Edition;
 use rustc_span::source_map;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
+use rustc_span::ErrorGuaranteed;
 use rustc_span::{Span, DUMMY_SP};
 use std::fmt::Write;
 use std::mem;
@@ -2332,14 +2333,106 @@ impl<'a> Parser<'a> {
                 }
             }
         };
+
+        // Store the end of function parameters to give better diagnostics
+        // inside `parse_fn_body()`.
+        let fn_params_end = self.prev_token.span.shrink_to_hi();
+
         generics.where_clause = self.parse_where_clause()?; // `where T: Ord`
 
+        // `fn_params_end` is needed only when it's followed by a where clause.
+        let fn_params_end =
+            if generics.where_clause.has_where_token { Some(fn_params_end) } else { None };
+
         let mut sig_hi = self.prev_token.span;
-        let body = self.parse_fn_body(attrs, &ident, &mut sig_hi, fn_parse_mode.req_body)?; // `;` or `{ ... }`.
+        // Either `;` or `{ ... }`.
+        let body =
+            self.parse_fn_body(attrs, &ident, &mut sig_hi, fn_parse_mode.req_body, fn_params_end)?;
         let fn_sig_span = sig_lo.to(sig_hi);
         Ok((ident, FnSig { header, decl, span: fn_sig_span }, generics, body))
     }
 
+    /// Provide diagnostics when function body is not found
+    fn error_fn_body_not_found(
+        &mut self,
+        ident_span: Span,
+        req_body: bool,
+        fn_params_end: Option<Span>,
+    ) -> PResult<'a, ErrorGuaranteed> {
+        let expected = if req_body {
+            &[token::OpenDelim(Delimiter::Brace)][..]
+        } else {
+            &[token::Semi, token::OpenDelim(Delimiter::Brace)]
+        };
+        match self.expected_one_of_not_found(&[], expected) {
+            Ok(error_guaranteed) => Ok(error_guaranteed),
+            Err(mut err) => {
+                if self.token.kind == token::CloseDelim(Delimiter::Brace) {
+                    // The enclosing `mod`, `trait` or `impl` is being closed, so keep the `fn` in
+                    // the AST for typechecking.
+                    err.span_label(ident_span, "while parsing this `fn`");
+                    Ok(err.emit())
+                } else if self.token.kind == token::RArrow
+                    && let Some(fn_params_end) = fn_params_end
+                {
+                    // Instead of a function body, the parser has encountered a right arrow
+                    // preceded by a where clause.
+
+                    // Find whether token behind the right arrow is a function trait and
+                    // store its span.
+                    let fn_trait_span =
+                        [sym::FnOnce, sym::FnMut, sym::Fn].into_iter().find_map(|symbol| {
+                            if self.prev_token.is_ident_named(symbol) {
+                                Some(self.prev_token.span)
+                            } else {
+                                None
+                            }
+                        });
+
+                    // Parse the return type (along with the right arrow) and store its span.
+                    // If there's a parse error, cancel it and return the existing error
+                    // as we are primarily concerned with the
+                    // expected-function-body-but-found-something-else error here.
+                    let arrow_span = self.token.span;
+                    let ty_span = match self.parse_ret_ty(
+                        AllowPlus::Yes,
+                        RecoverQPath::Yes,
+                        RecoverReturnSign::Yes,
+                    ) {
+                        Ok(ty_span) => ty_span.span().shrink_to_hi(),
+                        Err(parse_error) => {
+                            parse_error.cancel();
+                            return Err(err);
+                        }
+                    };
+                    let ret_ty_span = arrow_span.to(ty_span);
+
+                    if let Some(fn_trait_span) = fn_trait_span {
+                        // Typo'd Fn* trait bounds such as
+                        // fn foo<F>() where F: FnOnce -> () {}
+                        err.subdiagnostic(errors::FnTraitMissingParen { span: fn_trait_span });
+                    } else if let Ok(snippet) = self.psess.source_map().span_to_snippet(ret_ty_span)
+                    {
+                        // If token behind right arrow is not a Fn* trait, the programmer
+                        // probably misplaced the return type after the where clause like
+                        // `fn foo<T>() where T: Default -> u8 {}`
+                        err.primary_message(
+                            "return type should be specified after the function parameters",
+                        );
+                        err.subdiagnostic(errors::MisplacedReturnType {
+                            fn_params_end,
+                            snippet,
+                            ret_ty_span,
+                        });
+                    }
+                    Err(err)
+                } else {
+                    Err(err)
+                }
+            }
+        }
+    }
+
     /// Parse the "body" of a function.
     /// This can either be `;` when there's no body,
     /// or e.g. a block when the function is a provided one.
@@ -2349,6 +2442,7 @@ impl<'a> Parser<'a> {
         ident: &Ident,
         sig_hi: &mut Span,
         req_body: bool,
+        fn_params_end: Option<Span>,
     ) -> PResult<'a, Option<P<Block>>> {
         let has_semi = if req_body {
             self.token.kind == TokenKind::Semi
@@ -2377,33 +2471,7 @@ impl<'a> Parser<'a> {
             });
             (AttrVec::new(), Some(self.mk_block_err(span, guar)))
         } else {
-            let expected = if req_body {
-                &[token::OpenDelim(Delimiter::Brace)][..]
-            } else {
-                &[token::Semi, token::OpenDelim(Delimiter::Brace)]
-            };
-            if let Err(mut err) = self.expected_one_of_not_found(&[], expected) {
-                if self.token.kind == token::CloseDelim(Delimiter::Brace) {
-                    // The enclosing `mod`, `trait` or `impl` is being closed, so keep the `fn` in
-                    // the AST for typechecking.
-                    err.span_label(ident.span, "while parsing this `fn`");
-                    err.emit();
-                } else {
-                    // check for typo'd Fn* trait bounds such as
-                    // fn foo<F>() where F: FnOnce -> () {}
-                    if self.token.kind == token::RArrow {
-                        let machine_applicable = [sym::FnOnce, sym::FnMut, sym::Fn]
-                            .into_iter()
-                            .any(|s| self.prev_token.is_ident_named(s));
-
-                        err.subdiagnostic(errors::FnTraitMissingParen {
-                            span: self.prev_token.span,
-                            machine_applicable,
-                        });
-                    }
-                    return Err(err);
-                }
-            }
+            self.error_fn_body_not_found(ident.span, req_body, fn_params_end)?;
             (AttrVec::new(), None)
         };
         attrs.extend(inner_attrs);