Rollup of 13 pull requests

Cargo.lock

@@ -3417,18 +3417,29 @@ version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
  "memchr",
+ "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_index",
  "rustc_lexer",
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
- "rustc_type_ir",
  "smallvec",
  "thin-vec",
  "tracing",
 ]
 
+[[package]]
+name = "rustc_ast_ir"
+version = "0.0.0"
+dependencies = [
+ "rustc_data_structures",
+ "rustc_macros",
+ "rustc_serialize",
+ "rustc_span",
+ "smallvec",
+]
+
 [[package]]
 name = "rustc_ast_lowering"
 version = "0.0.0"
@@ -4181,6 +4192,7 @@ dependencies = [
  "rustc_apfloat",
  "rustc_arena",
  "rustc_ast",
+ "rustc_ast_ir",
  "rustc_attr",
  "rustc_data_structures",
  "rustc_error_messages",
@@ -4661,6 +4673,7 @@ version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
  "derivative",
+ "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_index",
  "rustc_macros",

compiler/rustc_ast/Cargo.toml

@@ -8,14 +8,13 @@ edition = "2021"
 # tidy-alphabetical-start
 bitflags = "2.4.1"
 memchr = "=2.5.0"
+rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_index = { path = "../rustc_index" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
-# For Mutability and Movability, which could be uplifted into a common crate.
-rustc_type_ir = { path = "../rustc_type_ir" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.12"
 tracing = "0.1"

compiler/rustc_ast/src/ast.rs

@@ -27,6 +27,7 @@ pub use UnsafeSource::*;
 use crate::ptr::P;
 use crate::token::{self, CommentKind, Delimiter};
 use crate::tokenstream::{DelimSpan, LazyAttrTokenStream, TokenStream};
+pub use rustc_ast_ir::{Movability, Mutability};
 use rustc_data_structures::packed::Pu128;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::stack::ensure_sufficient_stack;
@@ -35,7 +36,6 @@ use rustc_macros::HashStable_Generic;
 use rustc_span::source_map::{respan, Spanned};
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{ErrorGuaranteed, Span, DUMMY_SP};
-pub use rustc_type_ir::{Movability, Mutability};
 use std::fmt;
 use std::mem;
 use thin_vec::{thin_vec, ThinVec};

compiler/rustc_ast_ir/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "rustc_ast_ir"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+# tidy-alphabetical-start
+rustc_data_structures = { path = "../rustc_data_structures", optional = true }
+rustc_macros = { path = "../rustc_macros", optional = true }
+rustc_serialize = { path = "../rustc_serialize", optional = true }
+rustc_span = { path = "../rustc_span", optional = true }
+smallvec = { version = "1.8.1" }
+# tidy-alphabetical-end
+
+[features]
+default = ["nightly"]
+nightly = [
+    "rustc_serialize",
+    "rustc_data_structures",
+    "rustc_macros",
+    "rustc_span",
+]

compiler/rustc_ast_ir/src/lib.rs

@@ -0,0 +1,68 @@
+#![cfg_attr(feature = "nightly", feature(rustc_attrs))]
+#![cfg_attr(feature = "nightly", allow(internal_features))]
+
+#[cfg(feature = "nightly")]
+#[macro_use]
+extern crate rustc_macros;
+
+/// The movability of a coroutine / closure literal:
+/// whether a coroutine contains self-references, causing it to be `!Unpin`.
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Copy)]
+#[cfg_attr(feature = "nightly", derive(Encodable, Decodable, HashStable_NoContext))]
+pub enum Movability {
+    /// May contain self-references, `!Unpin`.
+    Static,
+    /// Must not contain self-references, `Unpin`.
+    Movable,
+}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Copy)]
+#[cfg_attr(feature = "nightly", derive(Encodable, Decodable, HashStable_NoContext))]
+pub enum Mutability {
+    // N.B. Order is deliberate, so that Not < Mut
+    Not,
+    Mut,
+}
+
+impl Mutability {
+    pub fn invert(self) -> Self {
+        match self {
+            Mutability::Mut => Mutability::Not,
+            Mutability::Not => Mutability::Mut,
+        }
+    }
+
+    /// Returns `""` (empty string) or `"mut "` depending on the mutability.
+    pub fn prefix_str(self) -> &'static str {
+        match self {
+            Mutability::Mut => "mut ",
+            Mutability::Not => "",
+        }
+    }
+
+    /// Returns `"&"` or `"&mut "` depending on the mutability.
+    pub fn ref_prefix_str(self) -> &'static str {
+        match self {
+            Mutability::Not => "&",
+            Mutability::Mut => "&mut ",
+        }
+    }
+
+    /// Returns `""` (empty string) or `"mutably "` depending on the mutability.
+    pub fn mutably_str(self) -> &'static str {
+        match self {
+            Mutability::Not => "",
+            Mutability::Mut => "mutably ",
+        }
+    }
+
+    /// Return `true` if self is mutable
+    pub fn is_mut(self) -> bool {
+        matches!(self, Self::Mut)
+    }
+
+    /// Return `true` if self is **not** mutable
+    pub fn is_not(self) -> bool {
+        matches!(self, Self::Not)
+    }
+}

compiler/rustc_const_eval/src/errors.rs

@@ -11,11 +11,10 @@ use rustc_middle::mir::interpret::{
     PointerKind, ResourceExhaustionInfo, UndefinedBehaviorInfo, UnsupportedOpInfo,
     ValidationErrorInfo,
 };
-use rustc_middle::ty::{self, Ty};
+use rustc_middle::ty::{self, Mutability, Ty};
 use rustc_span::Span;
 use rustc_target::abi::call::AdjustForForeignAbiError;
 use rustc_target::abi::{Size, WrappingRange};
-use rustc_type_ir::Mutability;
 
 use crate::interpret::InternKind;
 

compiler/rustc_const_eval/src/util/caller_location.rs

@@ -1,10 +1,9 @@
 use rustc_hir::LangItem;
 use rustc_middle::mir;
 use rustc_middle::query::TyCtxtAt;
-use rustc_middle::ty;
 use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::{self, Mutability};
 use rustc_span::symbol::Symbol;
-use rustc_type_ir::Mutability;
 
 use crate::const_eval::{mk_eval_cx_to_read_const_val, CanAccessMutGlobal, CompileTimeEvalContext};
 use crate::interpret::*;

compiler/rustc_feature/src/builtin_attrs.rs

@@ -390,20 +390,21 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
 
     // Entry point:
     gated!(unix_sigpipe, Normal, template!(Word, NameValueStr: "inherit|sig_ign|sig_dfl"), ErrorFollowing, experimental!(unix_sigpipe)),
-    ungated!(start, Normal, template!(Word), WarnFollowing),
-    ungated!(no_start, CrateLevel, template!(Word), WarnFollowing),
-    ungated!(no_main, CrateLevel, template!(Word), WarnFollowing),
+    ungated!(start, Normal, template!(Word), WarnFollowing, @only_local: true),
+    ungated!(no_start, CrateLevel, template!(Word), WarnFollowing, @only_local: true),
+    ungated!(no_main, CrateLevel, template!(Word), WarnFollowing, @only_local: true),
 
     // Modules, prelude, and resolution:
-    ungated!(path, Normal, template!(NameValueStr: "file"), FutureWarnFollowing),
-    ungated!(no_std, CrateLevel, template!(Word), WarnFollowing),
-    ungated!(no_implicit_prelude, Normal, template!(Word), WarnFollowing),
+    ungated!(path, Normal, template!(NameValueStr: "file"), FutureWarnFollowing, @only_local: true),
+    ungated!(no_std, CrateLevel, template!(Word), WarnFollowing, @only_local: true),
+    ungated!(no_implicit_prelude, Normal, template!(Word), WarnFollowing, @only_local: true),
     ungated!(non_exhaustive, Normal, template!(Word), WarnFollowing),
 
     // Runtime
     ungated!(
         windows_subsystem, CrateLevel,
-        template!(NameValueStr: "windows|console"), FutureWarnFollowing
+        template!(NameValueStr: "windows|console"), FutureWarnFollowing,
+        @only_local: true
     ),
     ungated!(panic_handler, Normal, template!(Word), WarnFollowing), // RFC 2070
 
@@ -416,13 +417,17 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         DuplicatesOk, @only_local: true,
     ),
     ungated!(track_caller, Normal, template!(Word), WarnFollowing),
-    ungated!(instruction_set, Normal, template!(List: "set"), ErrorPreceding),
+    ungated!(instruction_set, Normal, template!(List: "set"), ErrorPreceding, @only_local: true),
     gated!(
         no_sanitize, Normal,
         template!(List: "address, kcfi, memory, thread"), DuplicatesOk,
-        experimental!(no_sanitize)
+        @only_local: true, experimental!(no_sanitize)
+    ),
+    gated!(
+        coverage, Normal, template!(Word, List: "on|off"),
+        WarnFollowing, @only_local: true,
+        coverage_attribute, experimental!(coverage)
     ),
-    gated!(coverage, Normal, template!(Word, List: "on|off"), WarnFollowing, coverage_attribute, experimental!(coverage)),
 
     ungated!(
         doc, Normal, template!(List: "hidden|inline|...", NameValueStr: "string"), DuplicatesOk
@@ -431,7 +436,8 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     // Debugging
     ungated!(
         debugger_visualizer, Normal,
-        template!(List: r#"natvis_file = "...", gdb_script_file = "...""#), DuplicatesOk
+        template!(List: r#"natvis_file = "...", gdb_script_file = "...""#),
+        DuplicatesOk, @only_local: true
     ),
 
     // ==========================================================================
@@ -455,26 +461,35 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         marker_trait_attr, experimental!(marker)
     ),
     gated!(
-        thread_local, Normal, template!(Word), WarnFollowing,
+        thread_local, Normal, template!(Word), WarnFollowing, @only_local: true,
         "`#[thread_local]` is an experimental feature, and does not currently handle destructors",
     ),
-    gated!(no_core, CrateLevel, template!(Word), WarnFollowing, experimental!(no_core)),
+    gated!(
+        no_core, CrateLevel, template!(Word), WarnFollowing,
+        @only_local: true, experimental!(no_core)
+    ),
     // RFC 2412
     gated!(
-        optimize, Normal, template!(List: "size|speed"), ErrorPreceding, optimize_attribute,
-        experimental!(optimize),
+        optimize, Normal, template!(List: "size|speed"), ErrorPreceding,
+        @only_local: true, optimize_attribute, experimental!(optimize)
     ),
 
-    gated!(ffi_pure, Normal, template!(Word), WarnFollowing, experimental!(ffi_pure)),
-    gated!(ffi_const, Normal, template!(Word), WarnFollowing, experimental!(ffi_const)),
+    gated!(
+        ffi_pure, Normal, template!(Word), WarnFollowing,
+        @only_local: true, experimental!(ffi_pure)
+    ),
+    gated!(
+        ffi_const, Normal, template!(Word), WarnFollowing,
+        @only_local: true, experimental!(ffi_const)
+    ),
     gated!(
         register_tool, CrateLevel, template!(List: "tool1, tool2, ..."), DuplicatesOk,
-        experimental!(register_tool),
+        @only_local: true, experimental!(register_tool),
     ),
 
     gated!(
         cmse_nonsecure_entry, Normal, template!(Word), WarnFollowing,
-        experimental!(cmse_nonsecure_entry)
+        @only_local: true, experimental!(cmse_nonsecure_entry)
     ),
     // RFC 2632
     gated!(
@@ -492,11 +507,14 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     // `#[collapse_debuginfo]`
     gated!(
         collapse_debuginfo, Normal, template!(Word, List: "no|external|yes"), ErrorFollowing,
-        experimental!(collapse_debuginfo)
+        @only_local: true, experimental!(collapse_debuginfo)
     ),
 
     // RFC 2397
-    gated!(do_not_recommend, Normal, template!(Word), WarnFollowing, experimental!(do_not_recommend)),
+    gated!(
+        do_not_recommend, Normal, template!(Word), WarnFollowing,
+        @only_local: true, experimental!(do_not_recommend)
+    ),
 
     // `#[cfi_encoding = ""]`
     gated!(
@@ -528,7 +546,8 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     ),
     ungated!(
         rustc_default_body_unstable, Normal,
-        template!(List: r#"feature = "name", reason = "...", issue = "N""#), DuplicatesOk
+        template!(List: r#"feature = "name", reason = "...", issue = "N""#),
+        DuplicatesOk, @only_local: true
     ),
     gated!(
         allow_internal_unstable, Normal, template!(Word, List: "feat1, feat2, ..."), DuplicatesOk,

compiler/rustc_hir/src/definitions.rs

@@ -420,7 +420,9 @@ impl DefPathData {
     pub fn name(&self) -> DefPathDataName {
         use self::DefPathData::*;
         match *self {
-            TypeNs(name) if name == kw::Empty => DefPathDataName::Anon { namespace: sym::opaque },
+            TypeNs(name) if name == kw::Empty => {
+                DefPathDataName::Anon { namespace: sym::synthetic }
+            }
             TypeNs(name) | ValueNs(name) | MacroNs(name) | LifetimeNs(name) => {
                 DefPathDataName::Named(name)
             }

compiler/rustc_hir_analysis/src/check/errs.rs

@@ -1,9 +1,8 @@
 use rustc_hir as hir;
 use rustc_hir_pretty::qpath_to_string;
 use rustc_lint_defs::builtin::STATIC_MUT_REFS;
-use rustc_middle::ty::TyCtxt;
+use rustc_middle::ty::{Mutability, TyCtxt};
 use rustc_span::Span;
-use rustc_type_ir::Mutability;
 
 use crate::errors;
 

compiler/rustc_hir_typeck/src/coercion.rs

@@ -636,6 +636,20 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
                 {
                     self.resolve_vars_if_possible(trait_pred)
                 }
+                // Eagerly process alias-relate obligations in new trait solver,
+                // since these can be emitted in the process of solving trait goals,
+                // but we need to constrain vars before processing goals mentioning
+                // them.
+                Some(ty::PredicateKind::AliasRelate(..)) => {
+                    let mut fulfill_cx = <dyn TraitEngine<'tcx>>::new(self);
+                    fulfill_cx.register_predicate_obligation(self, obligation);
+                    let errs = fulfill_cx.select_where_possible(self);
+                    if !errs.is_empty() {
+                        return Err(TypeError::Mismatch);
+                    }
+                    coercion.obligations.extend(fulfill_cx.pending_obligations());
+                    continue;
+                }
                 _ => {
                     coercion.obligations.push(obligation);
                     continue;