Auto merge of rust-lang#127476 - jieyouxu:rollup-16wyb0b, r=jieyouxu

Rollup of 10 pull requests

Successful merges:

 - rust-lang#126841 ([`macro_metavar_expr_concat`] Add support for literals)
 - rust-lang#126881 (Make `NEVER_TYPE_FALLBACK_FLOWING_INTO_UNSAFE` a deny-by-default lint in edition 2024)
 - rust-lang#126921 (Give VaList its own home)
 - rust-lang#127367 (Run alloc sync tests)
 - rust-lang#127431 (Use field ident spans directly instead of the full field span in diagnostics on local fields)
 - rust-lang#127437 (Uplift trait ref is knowable into `rustc_next_trait_solver`)
 - rust-lang#127439 (Uplift elaboration into `rustc_type_ir`)
 - rust-lang#127451 (Improve `run-make/output-type-permutations` code and improve `filename_not_in_denylist` API)
 - rust-lang#127452 (Fix intrinsic const parameter counting with `effects`)
 - rust-lang#127459 (rustdoc-json: add type/trait alias tests)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_expand/src/mbe/metavar_expr.rs

@@ -1,14 +1,15 @@
-use rustc_ast::token::{self, Delimiter, IdentIsRaw};
+use rustc_ast::token::{self, Delimiter, IdentIsRaw, Lit, Token, TokenKind};
 use rustc_ast::tokenstream::{RefTokenTreeCursor, TokenStream, TokenTree};
 use rustc_ast::{LitIntType, LitKind};
 use rustc_ast_pretty::pprust;
 use rustc_errors::{Applicability, PResult};
 use rustc_macros::{Decodable, Encodable};
 use rustc_session::parse::ParseSess;
 use rustc_span::symbol::Ident;
-use rustc_span::Span;
+use rustc_span::{Span, Symbol};
 
 pub(crate) const RAW_IDENT_ERR: &str = "`${concat(..)}` currently does not support raw identifiers";
+pub(crate) const UNSUPPORTED_CONCAT_ELEM_ERR: &str = "expected identifier or string literal";
 
 /// A meta-variable expression, for expansions based on properties of meta-variables.
 #[derive(Debug, PartialEq, Encodable, Decodable)]
@@ -51,11 +52,26 @@ impl MetaVarExpr {
                 let mut result = Vec::new();
                 loop {
                     let is_var = try_eat_dollar(&mut iter);
-                    let element_ident = parse_ident(&mut iter, psess, outer_span)?;
+                    let token = parse_token(&mut iter, psess, outer_span)?;
                     let element = if is_var {
-                        MetaVarExprConcatElem::Var(element_ident)
+                        MetaVarExprConcatElem::Var(parse_ident_from_token(psess, token)?)
+                    } else if let TokenKind::Literal(Lit {
+                        kind: token::LitKind::Str,
+                        symbol,
+                        suffix: None,
+                    }) = token.kind
+                    {
+                        MetaVarExprConcatElem::Literal(symbol)
                     } else {
-                        MetaVarExprConcatElem::Ident(element_ident)
+                        match parse_ident_from_token(psess, token) {
+                            Err(err) => {
+                                err.cancel();
+                                return Err(psess
+                                    .dcx()
+                                    .struct_span_err(token.span, UNSUPPORTED_CONCAT_ELEM_ERR));
+                            }
+                            Ok(elem) => MetaVarExprConcatElem::Ident(elem),
+                        }
                     };
                     result.push(element);
                     if iter.look_ahead(0).is_none() {
@@ -105,11 +121,13 @@ impl MetaVarExpr {
 
 #[derive(Debug, Decodable, Encodable, PartialEq)]
 pub(crate) enum MetaVarExprConcatElem {
-    /// There is NO preceding dollar sign, which means that this identifier should be interpreted
-    /// as a literal.
+    /// Identifier WITHOUT a preceding dollar sign, which means that this identifier should be
+    /// interpreted as a literal.
     Ident(Ident),
-    /// There is a preceding dollar sign, which means that this identifier should be expanded
-    /// and interpreted as a variable.
+    /// For example, a number or a string.
+    Literal(Symbol),
+    /// Identifier WITH a preceding dollar sign, which means that this identifier should be
+    /// expanded and interpreted as a variable.
     Var(Ident),
 }
 
@@ -158,7 +176,7 @@ fn parse_depth<'psess>(
     span: Span,
 ) -> PResult<'psess, usize> {
     let Some(tt) = iter.next() else { return Ok(0) };
-    let TokenTree::Token(token::Token { kind: token::TokenKind::Literal(lit), .. }, _) = tt else {
+    let TokenTree::Token(Token { kind: TokenKind::Literal(lit), .. }, _) = tt else {
         return Err(psess
             .dcx()
             .struct_span_err(span, "meta-variable expression depth must be a literal"));
@@ -180,12 +198,14 @@ fn parse_ident<'psess>(
     psess: &'psess ParseSess,
     fallback_span: Span,
 ) -> PResult<'psess, Ident> {
-    let Some(tt) = iter.next() else {
-        return Err(psess.dcx().struct_span_err(fallback_span, "expected identifier"));
-    };
-    let TokenTree::Token(token, _) = tt else {
-        return Err(psess.dcx().struct_span_err(tt.span(), "expected identifier"));
-    };
+    let token = parse_token(iter, psess, fallback_span)?;
+    parse_ident_from_token(psess, token)
+}
+
+fn parse_ident_from_token<'psess>(
+    psess: &'psess ParseSess,
+    token: &Token,
+) -> PResult<'psess, Ident> {
     if let Some((elem, is_raw)) = token.ident() {
         if let IdentIsRaw::Yes = is_raw {
             return Err(psess.dcx().struct_span_err(elem.span, RAW_IDENT_ERR));
@@ -205,10 +225,24 @@ fn parse_ident<'psess>(
     Err(err)
 }
 
+fn parse_token<'psess, 't>(
+    iter: &mut RefTokenTreeCursor<'t>,
+    psess: &'psess ParseSess,
+    fallback_span: Span,
+) -> PResult<'psess, &'t Token> {
+    let Some(tt) = iter.next() else {
+        return Err(psess.dcx().struct_span_err(fallback_span, UNSUPPORTED_CONCAT_ELEM_ERR));
+    };
+    let TokenTree::Token(token, _) = tt else {
+        return Err(psess.dcx().struct_span_err(tt.span(), UNSUPPORTED_CONCAT_ELEM_ERR));
+    };
+    Ok(token)
+}
+
 /// Tries to move the iterator forward returning `true` if there is a comma. If not, then the
 /// iterator is not modified and the result is `false`.
 fn try_eat_comma(iter: &mut RefTokenTreeCursor<'_>) -> bool {
-    if let Some(TokenTree::Token(token::Token { kind: token::Comma, .. }, _)) = iter.look_ahead(0) {
+    if let Some(TokenTree::Token(Token { kind: token::Comma, .. }, _)) = iter.look_ahead(0) {
         let _ = iter.next();
         return true;
     }
@@ -218,8 +252,7 @@ fn try_eat_comma(iter: &mut RefTokenTreeCursor<'_>) -> bool {
 /// Tries to move the iterator forward returning `true` if there is a dollar sign. If not, then the
 /// iterator is not modified and the result is `false`.
 fn try_eat_dollar(iter: &mut RefTokenTreeCursor<'_>) -> bool {
-    if let Some(TokenTree::Token(token::Token { kind: token::Dollar, .. }, _)) = iter.look_ahead(0)
-    {
+    if let Some(TokenTree::Token(Token { kind: token::Dollar, .. }, _)) = iter.look_ahead(0) {
         let _ = iter.next();
         return true;
     }
@@ -232,8 +265,7 @@ fn eat_dollar<'psess>(
     psess: &'psess ParseSess,
     span: Span,
 ) -> PResult<'psess, ()> {
-    if let Some(TokenTree::Token(token::Token { kind: token::Dollar, .. }, _)) = iter.look_ahead(0)
-    {
+    if let Some(TokenTree::Token(Token { kind: token::Dollar, .. }, _)) = iter.look_ahead(0) {
         let _ = iter.next();
         return Ok(());
     }

compiler/rustc_expand/src/mbe/transcribe.rs

@@ -11,11 +11,13 @@ use rustc_ast::token::{self, Delimiter, Token, TokenKind};
 use rustc_ast::tokenstream::{DelimSpacing, DelimSpan, Spacing, TokenStream, TokenTree};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{pluralize, Diag, DiagCtxtHandle, PResult};
+use rustc_parse::lexer::nfc_normalize;
 use rustc_parse::parser::ParseNtResult;
 use rustc_session::parse::ParseSess;
+use rustc_session::parse::SymbolGallery;
 use rustc_span::hygiene::{LocalExpnId, Transparency};
 use rustc_span::symbol::{sym, Ident, MacroRulesNormalizedIdent};
-use rustc_span::{with_metavar_spans, Span, Symbol, SyntaxContext};
+use rustc_span::{with_metavar_spans, Span, SyntaxContext};
 use smallvec::{smallvec, SmallVec};
 use std::mem;
 
@@ -312,7 +314,16 @@ pub(super) fn transcribe<'a>(
 
             // Replace meta-variable expressions with the result of their expansion.
             mbe::TokenTree::MetaVarExpr(sp, expr) => {
-                transcribe_metavar_expr(dcx, expr, interp, &mut marker, &repeats, &mut result, sp)?;
+                transcribe_metavar_expr(
+                    dcx,
+                    expr,
+                    interp,
+                    &mut marker,
+                    &repeats,
+                    &mut result,
+                    sp,
+                    &psess.symbol_gallery,
+                )?;
             }
 
             // If we are entering a new delimiter, we push its contents to the `stack` to be
@@ -669,6 +680,7 @@ fn transcribe_metavar_expr<'a>(
     repeats: &[(usize, usize)],
     result: &mut Vec<TokenTree>,
     sp: &DelimSpan,
+    symbol_gallery: &SymbolGallery,
 ) -> PResult<'a, ()> {
     let mut visited_span = || {
         let mut span = sp.entire();
@@ -680,16 +692,26 @@ fn transcribe_metavar_expr<'a>(
             let mut concatenated = String::new();
             for element in elements.into_iter() {
                 let string = match element {
-                    MetaVarExprConcatElem::Ident(ident) => ident.to_string(),
-                    MetaVarExprConcatElem::Var(ident) => extract_ident(dcx, *ident, interp)?,
+                    MetaVarExprConcatElem::Ident(elem) => elem.to_string(),
+                    MetaVarExprConcatElem::Literal(elem) => elem.as_str().into(),
+                    MetaVarExprConcatElem::Var(elem) => extract_ident(dcx, *elem, interp)?,
                 };
                 concatenated.push_str(&string);
             }
+            let symbol = nfc_normalize(&concatenated);
+            let concatenated_span = visited_span();
+            if !rustc_lexer::is_ident(symbol.as_str()) {
+                return Err(dcx.struct_span_err(
+                    concatenated_span,
+                    "`${concat(..)}` is not generating a valid identifier",
+                ));
+            }
+            symbol_gallery.insert(symbol, concatenated_span);
             // The current implementation marks the span as coming from the macro regardless of
             // contexts of the concatenated identifiers but this behavior may change in the
             // future.
             result.push(TokenTree::Token(
-                Token::from_ast_ident(Ident::new(Symbol::intern(&concatenated), visited_span())),
+                Token::from_ast_ident(Ident::new(symbol, concatenated_span)),
                 Spacing::Alone,
             ));
         }

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -26,22 +26,20 @@ fn equate_intrinsic_type<'tcx>(
     n_cts: usize,
     sig: ty::PolyFnSig<'tcx>,
 ) {
-    let (own_counts, span) = match tcx.hir_node_by_def_id(def_id) {
+    let (generics, span) = match tcx.hir_node_by_def_id(def_id) {
         hir::Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, generics, _), .. })
         | hir::Node::ForeignItem(hir::ForeignItem {
             kind: hir::ForeignItemKind::Fn(.., generics, _),
             ..
-        }) => {
-            let own_counts = tcx.generics_of(def_id).own_counts();
-            (own_counts, generics.span)
-        }
+        }) => (tcx.generics_of(def_id), generics.span),
         _ => {
             struct_span_code_err!(tcx.dcx(), span, E0622, "intrinsic must be a function")
                 .with_span_label(span, "expected a function")
                 .emit();
             return;
         }
     };
+    let own_counts = generics.own_counts();
 
     let gen_count_ok = |found: usize, expected: usize, descr: &str| -> bool {
         if found != expected {
@@ -57,9 +55,17 @@ fn equate_intrinsic_type<'tcx>(
         }
     };
 
+    // the host effect param should be invisible as it shouldn't matter
+    // whether effects is enabled for the intrinsic provider crate.
+    let consts_count = if generics.host_effect_index.is_some() {
+        own_counts.consts - 1
+    } else {
+        own_counts.consts
+    };
+
     if gen_count_ok(own_counts.lifetimes, n_lts, "lifetime")
         && gen_count_ok(own_counts.types, n_tps, "type")
-        && gen_count_ok(own_counts.consts, n_cts, "const")
+        && gen_count_ok(consts_count, n_cts, "const")
     {
         let _ = check_function_signature(
             tcx,

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -478,7 +478,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, trait_def_id: LocalDefId) {
                             param_env,
                             item_def_id,
                             tcx.explicit_item_bounds(item_def_id)
-                                .instantiate_identity_iter_copied()
+                                .iter_identity_copied()
                                 .collect::<Vec<_>>(),
                             &FxIndexSet::default(),
                             gat_def_id,
@@ -1205,17 +1205,16 @@ fn check_associated_type_bounds(wfcx: &WfCheckingCtxt<'_, '_>, item: ty::AssocIt
     let bounds = wfcx.tcx().explicit_item_bounds(item.def_id);
 
     debug!("check_associated_type_bounds: bounds={:?}", bounds);
-    let wf_obligations =
-        bounds.instantiate_identity_iter_copied().flat_map(|(bound, bound_span)| {
-            let normalized_bound = wfcx.normalize(span, None, bound);
-            traits::wf::clause_obligations(
-                wfcx.infcx,
-                wfcx.param_env,
-                wfcx.body_def_id,
-                normalized_bound,
-                bound_span,
-            )
-        });
+    let wf_obligations = bounds.iter_identity_copied().flat_map(|(bound, bound_span)| {
+        let normalized_bound = wfcx.normalize(span, None, bound);
+        traits::wf::clause_obligations(
+            wfcx.infcx,
+            wfcx.param_env,
+            wfcx.body_def_id,
+            normalized_bound,
+            bound_span,
+        )
+    });
 
     wfcx.register_obligations(wf_obligations);
 }

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -286,7 +286,7 @@ fn orphan_check<'tcx>(
     tcx: TyCtxt<'tcx>,
     impl_def_id: LocalDefId,
     mode: OrphanCheckMode,
-) -> Result<(), OrphanCheckErr<'tcx, FxIndexSet<DefId>>> {
+) -> Result<(), OrphanCheckErr<TyCtxt<'tcx>, FxIndexSet<DefId>>> {
     // We only accept this routine to be invoked on implementations
     // of a trait, not inherent implementations.
     let trait_ref = tcx.impl_trait_ref(impl_def_id).unwrap();
@@ -326,17 +326,16 @@ fn orphan_check<'tcx>(
             ty
         };
 
-        Ok(ty)
+        Ok::<_, !>(ty)
     };
 
-    let Ok(result) = traits::orphan_check_trait_ref::<!>(
+    let result = traits::orphan_check_trait_ref(
         &infcx,
         trait_ref,
         traits::InCrate::Local { mode },
         lazily_normalize_ty,
-    ) else {
-        unreachable!()
-    };
+    )
+    .into_ok();
 
     // (2)  Try to map the remaining inference vars back to generic params.
     result.map_err(|err| match err {
@@ -369,7 +368,7 @@ fn emit_orphan_check_error<'tcx>(
     tcx: TyCtxt<'tcx>,
     trait_ref: ty::TraitRef<'tcx>,
     impl_def_id: LocalDefId,
-    err: traits::OrphanCheckErr<'tcx, FxIndexSet<DefId>>,
+    err: traits::OrphanCheckErr<TyCtxt<'tcx>, FxIndexSet<DefId>>,
 ) -> ErrorGuaranteed {
     match err {
         traits::OrphanCheckErr::NonLocalInputType(tys) => {
@@ -482,7 +481,7 @@ fn emit_orphan_check_error<'tcx>(
 
 fn lint_uncovered_ty_params<'tcx>(
     tcx: TyCtxt<'tcx>,
-    UncoveredTyParams { uncovered, local_ty }: UncoveredTyParams<'tcx, FxIndexSet<DefId>>,
+    UncoveredTyParams { uncovered, local_ty }: UncoveredTyParams<TyCtxt<'tcx>, FxIndexSet<DefId>>,
     impl_def_id: LocalDefId,
 ) {
     let hir_id = tcx.local_def_id_to_hir_id(impl_def_id);

compiler/rustc_hir_analysis/src/collect.rs

@@ -1201,6 +1201,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
 
     let is_marker = tcx.has_attr(def_id, sym::marker);
     let rustc_coinductive = tcx.has_attr(def_id, sym::rustc_coinductive);
+    let is_fundamental = tcx.has_attr(def_id, sym::fundamental);
 
     // FIXME: We could probably do way better attribute validation here.
     let mut skip_array_during_method_dispatch = false;
@@ -1352,6 +1353,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
         has_auto_impl: is_auto,
         is_marker,
         is_coinductive: rustc_coinductive || is_auto,
+        is_fundamental,
         skip_array_during_method_dispatch,
         skip_boxed_slice_during_method_dispatch,
         specialization_kind,

compiler/rustc_hir_analysis/src/lib.rs

@@ -71,6 +71,7 @@ This API is completely unstable and subject to change.
 #![feature(rustdoc_internals)]
 #![feature(slice_partition_dedup)]
 #![feature(try_blocks)]
+#![feature(unwrap_infallible)]
 // tidy-alphabetical-end
 
 #[macro_use]

compiler/rustc_hir_typeck/src/coercion.rs

@@ -1752,10 +1752,8 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
             fcx.probe(|_| {
                 let ocx = ObligationCtxt::new(fcx);
                 ocx.register_obligations(
-                    fcx.tcx
-                        .item_super_predicates(rpit_def_id)
-                        .instantiate_identity_iter()
-                        .filter_map(|clause| {
+                    fcx.tcx.item_super_predicates(rpit_def_id).iter_identity().filter_map(
+                        |clause| {
                             let predicate = clause
                                 .kind()
                                 .map_bound(|clause| match clause {
@@ -1776,7 +1774,8 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
                                 fcx.param_env,
                                 predicate,
                             ))
-                        }),
+                        },
+                    ),
                 );
                 ocx.select_where_possible().is_empty()
             })