Rollup of 2 pull requests

Cargo.lock

@@ -3270,6 +3270,7 @@ name = "rustc_ast_lowering"
 version = "0.0.0"
 dependencies = [
  "rustc_ast",
+ "rustc_ast_pretty",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_fluent_macro",

compiler/rustc_ast_lowering/Cargo.toml

@@ -9,6 +9,7 @@ doctest = false
 [dependencies]
 # tidy-alphabetical-start
 rustc_ast = { path = "../rustc_ast" }
+rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
 rustc_fluent_macro = { path = "../rustc_fluent_macro" }

compiler/rustc_ast_lowering/messages.ftl

@@ -103,6 +103,12 @@ ast_lowering_invalid_asm_template_modifier_reg_class =
 ast_lowering_invalid_asm_template_modifier_sym =
     asm template modifiers are not allowed for `sym` arguments
 
+ast_lowering_invalid_legacy_const_generic_arg =
+    invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+
+ast_lowering_invalid_legacy_const_generic_arg_suggestion =
+    try using a const generic argument instead
+
 ast_lowering_invalid_register =
     invalid register `{$reg}`: {$error}
 

compiler/rustc_ast_lowering/src/errors.rs

@@ -451,3 +451,26 @@ pub(crate) struct YieldInClosure {
     #[suggestion(code = "#[coroutine] ", applicability = "maybe-incorrect", style = "verbose")]
     pub suggestion: Option<Span>,
 }
+
+#[derive(Diagnostic)]
+#[diag(ast_lowering_invalid_legacy_const_generic_arg)]
+pub(crate) struct InvalidLegacyConstGenericArg {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub suggestion: UseConstGenericArg,
+}
+
+#[derive(Subdiagnostic)]
+#[multipart_suggestion(
+    ast_lowering_invalid_legacy_const_generic_arg_suggestion,
+    applicability = "maybe-incorrect"
+)]
+pub(crate) struct UseConstGenericArg {
+    #[suggestion_part(code = "::<{const_args}>")]
+    pub end_of_fn: Span,
+    pub const_args: String,
+    pub other_args: String,
+    #[suggestion_part(code = "{other_args}")]
+    pub call_args: Span,
+}

compiler/rustc_ast_lowering/src/expr.rs

@@ -1,18 +1,22 @@
 use std::assert_matches::assert_matches;
+use std::ops::ControlFlow;
 
 use rustc_ast::ptr::P as AstP;
 use rustc_ast::*;
+use rustc_ast_pretty::pprust::expr_to_string;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_data_structures::sync::Lrc;
 use rustc_hir as hir;
 use rustc_hir::HirId;
 use rustc_hir::def::{DefKind, Res};
 use rustc_middle::span_bug;
+use rustc_middle::ty::TyCtxt;
 use rustc_session::errors::report_lit_error;
 use rustc_span::source_map::{Spanned, respan};
 use rustc_span::symbol::{Ident, Symbol, kw, sym};
 use rustc_span::{DUMMY_SP, DesugaringKind, Span};
 use thin_vec::{ThinVec, thin_vec};
+use visit::{Visitor, walk_expr};
 
 use super::errors::{
     AsyncCoroutinesNotSupported, AwaitOnlyInAsyncFnAndBlocks, BaseExpressionDoubleDot,
@@ -23,9 +27,32 @@ use super::errors::{
 use super::{
     GenericArgsMode, ImplTraitContext, LoweringContext, ParamMode, ResolverAstLoweringExt,
 };
-use crate::errors::YieldInClosure;
+use crate::errors::{InvalidLegacyConstGenericArg, UseConstGenericArg, YieldInClosure};
 use crate::{AllowReturnTypeNotation, FnDeclKind, ImplTraitPosition, fluent_generated};
 
+struct WillCreateDefIdsVisitor {}
+
+impl<'v> rustc_ast::visit::Visitor<'v> for WillCreateDefIdsVisitor {
+    type Result = ControlFlow<Span>;
+
+    fn visit_anon_const(&mut self, c: &'v AnonConst) -> Self::Result {
+        ControlFlow::Break(c.value.span)
+    }
+
+    fn visit_item(&mut self, item: &'v Item) -> Self::Result {
+        ControlFlow::Break(item.span)
+    }
+
+    fn visit_expr(&mut self, ex: &'v Expr) -> Self::Result {
+        match ex.kind {
+            ExprKind::Gen(..) | ExprKind::ConstBlock(..) | ExprKind::Closure(..) => {
+                ControlFlow::Break(ex.span)
+            }
+            _ => walk_expr(self, ex),
+        }
+    }
+}
+
 impl<'hir> LoweringContext<'_, 'hir> {
     fn lower_exprs(&mut self, exprs: &[AstP<Expr>]) -> &'hir [hir::Expr<'hir>] {
         self.arena.alloc_from_iter(exprs.iter().map(|x| self.lower_expr_mut(x)))
@@ -396,10 +423,34 @@ impl<'hir> LoweringContext<'_, 'hir> {
             unreachable!();
         };
 
+        let mut error = None;
+        let mut invalid_expr_error = |tcx: TyCtxt<'_>, span| {
+            // Avoid emitting the error multiple times.
+            if error.is_none() {
+                let mut const_args = vec![];
+                let mut other_args = vec![];
+                for (idx, arg) in args.iter().enumerate() {
+                    if legacy_args_idx.contains(&idx) {
+                        const_args.push(format!("{{ {} }}", expr_to_string(arg)));
+                    } else {
+                        other_args.push(expr_to_string(arg));
+                    }
+                }
+                let suggestion = UseConstGenericArg {
+                    end_of_fn: f.span.shrink_to_hi(),
+                    const_args: const_args.join(", "),
+                    other_args: other_args.join(", "),
+                    call_args: args[0].span.to(args.last().unwrap().span),
+                };
+                error = Some(tcx.dcx().emit_err(InvalidLegacyConstGenericArg { span, suggestion }));
+            }
+            error.unwrap()
+        };
+
         // Split the arguments into const generics and normal arguments
         let mut real_args = vec![];
         let mut generic_args = ThinVec::new();
-        for (idx, arg) in args.into_iter().enumerate() {
+        for (idx, arg) in args.iter().cloned().enumerate() {
             if legacy_args_idx.contains(&idx) {
                 let parent_def_id = self.current_def_id_parent;
                 let node_id = self.next_node_id();
@@ -410,7 +461,20 @@ impl<'hir> LoweringContext<'_, 'hir> {
                     self.create_def(parent_def_id, node_id, kw::Empty, DefKind::AnonConst, f.span);
                 }
 
-                let anon_const = AnonConst { id: node_id, value: arg };
+                let mut visitor = WillCreateDefIdsVisitor {};
+                let const_value = if let ControlFlow::Break(span) = visitor.visit_expr(&arg) {
+                    AstP(Expr {
+                        id: self.next_node_id(),
+                        kind: ExprKind::Err(invalid_expr_error(self.tcx, span)),
+                        span: f.span,
+                        attrs: [].into(),
+                        tokens: None,
+                    })
+                } else {
+                    arg
+                };
+
+                let anon_const = AnonConst { id: node_id, value: const_value };
                 generic_args.push(AngleBracketedArg::Arg(GenericArg::Const(anon_const)));
             } else {
                 real_args.push(arg);

src/librustdoc/html/static/js/search.js

@@ -692,8 +692,6 @@ function createQueryElement(query, parserState, name, generics, isInGenerics) {
     const quadcolon = /::\s*::/.exec(path);
     if (path.startsWith("::")) {
         throw ["Paths cannot start with ", "::"];
-    } else if (path.endsWith("::")) {
-        throw ["Paths cannot end with ", "::"];
     } else if (quadcolon !== null) {
         throw ["Unexpected ", quadcolon[0]];
     }
@@ -3974,18 +3972,19 @@ class DocSearch {
 
             if (parsedQuery.foundElems === 1 && !parsedQuery.hasReturnArrow) {
                 const elem = parsedQuery.elems[0];
-                for (const id of this.nameTrie.search(elem.normalizedPathLast, this.tailTable)) {
+                // use arrow functions to preserve `this`.
+                const handleNameSearch = (id) => {
                     const row = this.searchIndex[id];
                     if (!typePassesFilter(elem.typeFilter, row.ty) ||
                         (filterCrates !== null && row.crate !== filterCrates)) {
-                        continue;
+                        return;
                     }
 
                     let pathDist = 0;
                     if (elem.fullPath.length > 1) {
                         pathDist = checkPath(elem.pathWithoutLast, row);
                         if (pathDist === null) {
-                            continue;
+                            return;
                         }
                     }
 
@@ -4008,9 +4007,20 @@ class DocSearch {
                             maxEditDistance,
                         );
                     }
+                };
+                if (elem.normalizedPathLast !== "") {
+                    const last = elem.normalizedPathLast;
+                    for (const id of this.nameTrie.search(last, this.tailTable)) {
+                        handleNameSearch(id);
+                    }
                 }
                 const length = this.searchIndex.length;
+
                 for (let i = 0, nSearchIndex = length; i < nSearchIndex; ++i) {
+                    // queries that end in :: bypass the trie
+                    if (elem.normalizedPathLast === "") {
+                        handleNameSearch(i);
+                    }
                     const row = this.searchIndex[i];
                     if (filterCrates !== null && row.crate !== filterCrates) {
                         continue;

tests/rustdoc-js-std/parser-errors.js

@@ -143,14 +143,6 @@ const PARSED = [
         returned: [],
         error: "Unexpected `:: ::`",
     },
-    {
-        query: "a::b::",
-        elems: [],
-        foundElems: 0,
-        userQuery: "a::b::",
-        returned: [],
-        error: "Paths cannot end with `::`",
-    },
     {
         query: ":a",
         elems: [],

tests/rustdoc-js-std/path-end-empty.js

@@ -0,0 +1,6 @@
+const EXPECTED = {
+    'query': 'Option::',
+    'others': [
+        { 'path': 'std::option::Option', 'name': 'get_or_insert_default' },
+    ],
+}

tests/ui/invalid/invalid-rustc_legacy_const_generics-issue-123077.rs

@@ -0,0 +1,31 @@
+//@ only-x86_64
+
+const fn foo<const U: i32>() -> i32 {
+    U
+}
+
+fn main() {
+    std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, || ());
+    //~^ invalid argument to a legacy const generic
+
+    std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, 5 + || ());
+    //~^ invalid argument to a legacy const generic
+
+    std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, foo::<{ 1 + 2 }>());
+    //~^ invalid argument to a legacy const generic
+
+    std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, foo::<3>());
+    //~^ invalid argument to a legacy const generic
+
+    std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, &const {});
+    //~^ invalid argument to a legacy const generic
+
+    std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, {
+        struct F();
+        //~^ invalid argument to a legacy const generic
+        1
+    });
+
+    std::arch::x86_64::_mm_inserti_si64(loop {}, loop {}, || (), 1 + || ());
+    //~^ invalid argument to a legacy const generic
+}

tests/ui/invalid/invalid-rustc_legacy_const_generics-issue-123077.stderr

@@ -0,0 +1,82 @@
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:8:55
+   |
+LL |     std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, || ());
+   |                                                       ^^^^^
+   |
+help: try using a const generic argument instead
+   |
+LL |     std::arch::x86_64::_mm_blend_ps::<{ || () }>(loop {}, loop {});
+   |                                    +++++++++++++ ~~~~~~~~~~~~~~~~
+
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:11:59
+   |
+LL |     std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, 5 + || ());
+   |                                                           ^^^^^
+   |
+help: try using a const generic argument instead
+   |
+LL |     std::arch::x86_64::_mm_blend_ps::<{ 5 + (|| ()) }>(loop {}, loop {});
+   |                                    +++++++++++++++++++ ~~~~~~~~~~~~~~~~
+
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:14:61
+   |
+LL |     std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, foo::<{ 1 + 2 }>());
+   |                                                             ^^^^^^^^^
+   |
+help: try using a const generic argument instead
+   |
+LL |     std::arch::x86_64::_mm_blend_ps::<{ foo::<{ 1 + 2 }>() }>(loop {}, loop {});
+   |                                    ++++++++++++++++++++++++++ ~~~~~~~~~~~~~~~~
+
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:17:61
+   |
+LL |     std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, foo::<3>());
+   |                                                             ^
+   |
+help: try using a const generic argument instead
+   |
+LL |     std::arch::x86_64::_mm_blend_ps::<{ foo::<3>() }>(loop {}, loop {});
+   |                                    ++++++++++++++++++ ~~~~~~~~~~~~~~~~
+
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:20:56
+   |
+LL |     std::arch::x86_64::_mm_blend_ps(loop {}, loop {}, &const {});
+   |                                                        ^^^^^^^^
+   |
+help: try using a const generic argument instead
+   |
+LL |     std::arch::x86_64::_mm_blend_ps::<{ &const {} }>(loop {}, loop {});
+   |                                    +++++++++++++++++ ~~~~~~~~~~~~~~~~
+
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:24:9
+   |
+LL |         struct F();
+   |         ^^^^^^^^^^^
+   |
+help: try using a const generic argument instead
+   |
+LL ~     std::arch::x86_64::_mm_blend_ps::<{ {
+LL +     struct F();
+LL +     1
+LL ~ } }>(loop {}, loop {});
+   |
+
+error: invalid argument to a legacy const generic: cannot have const blocks, closures, async blocks or items
+  --> $DIR/invalid-rustc_legacy_const_generics-issue-123077.rs:29:59
+   |
+LL |     std::arch::x86_64::_mm_inserti_si64(loop {}, loop {}, || (), 1 + || ());
+   |                                                           ^^^^^
+   |
+help: try using a const generic argument instead
+   |
+LL |     std::arch::x86_64::_mm_inserti_si64::<{ || () }, { 1 + (|| ()) }>(loop {}, loop {});
+   |                                        ++++++++++++++++++++++++++++++ ~~~~~~~~~~~~~~~~
+
+error: aborting due to 7 previous errors
+