Auto merge of rust-lang#106193 - compiler-errors:rollup-0l54wka, r=compiler-errors

Rollup of 9 pull requests

Successful merges:

 - rust-lang#103718 (More inference-friendly API for lazy)
 - rust-lang#105765 (Detect likely `.` -> `..` typo in method calls)
 - rust-lang#105852 (Suggest rewriting a malformed hex literal if we expect a float)
 - rust-lang#105965 (Provide local extern function arg names)
 - rust-lang#106064 (Partially fix `explicit_outlives_requirements` lint in macros)
 - rust-lang#106179 (Fix a formatting error in Iterator::for_each docs)
 - rust-lang#106181 (Fix doc comment parsing description in book)
 - rust-lang#106187 (Update the documentation of `Vec` to use `extend(array)` instead of `extend(array.iter().copied())`)
 - rust-lang#106189 (Fix UnsafeCell Documentation Spelling Error)

Failed merges:

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

Author: bors

compiler/rustc_ast_lowering/src/item.rs

@@ -1316,6 +1316,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 param.id,
                 &param.kind,
                 &param.bounds,
+                param.colon_span,
+                generics.span,
                 itctx,
                 PredicateOrigin::GenericParam,
             )
@@ -1365,6 +1367,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
         id: NodeId,
         kind: &GenericParamKind,
         bounds: &[GenericBound],
+        colon_span: Option<Span>,
+        parent_span: Span,
         itctx: &ImplTraitContext,
         origin: PredicateOrigin,
     ) -> Option<hir::WherePredicate<'hir>> {
@@ -1377,21 +1381,17 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
         let ident = self.lower_ident(ident);
         let param_span = ident.span;
-        let span = bounds
-            .iter()
-            .fold(Some(param_span.shrink_to_hi()), |span: Option<Span>, bound| {
-                let bound_span = bound.span();
-                // We include bounds that come from a `#[derive(_)]` but point at the user's code,
-                // as we use this method to get a span appropriate for suggestions.
-                if !bound_span.can_be_used_for_suggestions() {
-                    None
-                } else if let Some(span) = span {
-                    Some(span.to(bound_span))
-                } else {
-                    Some(bound_span)
-                }
-            })
-            .unwrap_or(param_span.shrink_to_hi());
+
+        // Reconstruct the span of the entire predicate from the individual generic bounds.
+        let span_start = colon_span.unwrap_or_else(|| param_span.shrink_to_hi());
+        let span = bounds.iter().fold(span_start, |span_accum, bound| {
+            match bound.span().find_ancestor_inside(parent_span) {
+                Some(bound_span) => span_accum.to(bound_span),
+                None => span_accum,
+            }
+        });
+        let span = self.lower_span(span);
+
         match kind {
             GenericParamKind::Const { .. } => None,
             GenericParamKind::Type { .. } => {

compiler/rustc_ast_lowering/src/lib.rs

@@ -2245,14 +2245,15 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     ) -> (hir::GenericParam<'hir>, Option<hir::WherePredicate<'hir>>, hir::TyKind<'hir>) {
         // Add a definition for the in-band `Param`.
         let def_id = self.local_def_id(node_id);
+        let span = self.lower_span(span);
 
         // Set the name to `impl Bound1 + Bound2`.
         let param = hir::GenericParam {
             hir_id: self.lower_node_id(node_id),
             def_id,
             name: ParamName::Plain(self.lower_ident(ident)),
             pure_wrt_drop: false,
-            span: self.lower_span(span),
+            span,
             kind: hir::GenericParamKind::Type { default: None, synthetic: true },
             colon_span: None,
         };
@@ -2262,6 +2263,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             node_id,
             &GenericParamKind::Type { default: None },
             bounds,
+            /* colon_span */ None,
+            span,
             &ImplTraitContext::Universal,
             hir::PredicateOrigin::ImplTrait,
         );
@@ -2271,7 +2274,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let ty = hir::TyKind::Path(hir::QPath::Resolved(
             None,
             self.arena.alloc(hir::Path {
-                span: self.lower_span(span),
+                span,
                 res,
                 segments:
                     arena_vec![self; hir::PathSegment::new(self.lower_ident(ident), hir_id, res)],

compiler/rustc_hir_typeck/src/demand.rs

@@ -74,6 +74,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.note_type_is_not_clone(err, expected, expr_ty, expr);
         self.note_need_for_fn_pointer(err, expected, expr_ty);
         self.note_internal_mutation_in_method(err, expr, expected, expr_ty);
+        self.check_for_range_as_method_call(err, expr, expr_ty, expected);
     }
 
     /// Requires that the two types unify, and prints an error message if
@@ -1607,4 +1608,69 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             _ => false,
         }
     }
+
+    /// Identify when the user has written `foo..bar()` instead of `foo.bar()`.
+    pub fn check_for_range_as_method_call(
+        &self,
+        err: &mut Diagnostic,
+        expr: &hir::Expr<'_>,
+        checked_ty: Ty<'tcx>,
+        expected_ty: Ty<'tcx>,
+    ) {
+        if !hir::is_range_literal(expr) {
+            return;
+        }
+        let hir::ExprKind::Struct(
+            hir::QPath::LangItem(LangItem::Range, ..),
+            [start, end],
+            _,
+        ) = expr.kind else { return; };
+        let parent = self.tcx.hir().get_parent_node(expr.hir_id);
+        if let Some(hir::Node::ExprField(_)) = self.tcx.hir().find(parent) {
+            // Ignore `Foo { field: a..Default::default() }`
+            return;
+        }
+        let mut expr = end.expr;
+        while let hir::ExprKind::MethodCall(_, rcvr, ..) = expr.kind {
+            // Getting to the root receiver and asserting it is a fn call let's us ignore cases in
+            // `src/test/ui/methods/issues/issue-90315.stderr`.
+            expr = rcvr;
+        }
+        let hir::ExprKind::Call(method_name, _) = expr.kind else { return; };
+        let ty::Adt(adt, _) = checked_ty.kind() else { return; };
+        if self.tcx.lang_items().range_struct() != Some(adt.did()) {
+            return;
+        }
+        if let ty::Adt(adt, _) = expected_ty.kind()
+            && self.tcx.lang_items().range_struct() == Some(adt.did())
+        {
+            return;
+        }
+        // Check if start has method named end.
+        let hir::ExprKind::Path(hir::QPath::Resolved(None, p)) = method_name.kind else { return; };
+        let [hir::PathSegment { ident, .. }] = p.segments else { return; };
+        let self_ty = self.typeck_results.borrow().expr_ty(start.expr);
+        let Ok(_pick) = self.probe_for_name(
+            probe::Mode::MethodCall,
+            *ident,
+            probe::IsSuggestion(true),
+            self_ty,
+            expr.hir_id,
+            probe::ProbeScope::AllTraits,
+        ) else { return; };
+        let mut sugg = ".";
+        let mut span = start.expr.span.between(end.expr.span);
+        if span.lo() + BytePos(2) == span.hi() {
+            // There's no space between the start, the range op and the end, suggest removal which
+            // will be more noticeable than the replacement of `..` with `.`.
+            span = span.with_lo(span.lo() + BytePos(1));
+            sugg = "";
+        }
+        err.span_suggestion_verbose(
+            span,
+            "you likely meant to write a method call instead of a range",
+            sugg,
+            Applicability::MachineApplicable,
+        );
+    }
 }

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -19,6 +19,7 @@ use rustc_middle::ty::{
     TypeVisitable,
 };
 use rustc_session::errors::ExprParenthesesNeeded;
+use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::{Span, Symbol};
 use rustc_trait_selection::infer::InferCtxtExt;
@@ -1259,6 +1260,31 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 );
                 true
             }
+            ExprKind::Lit(Spanned {
+                node: rustc_ast::LitKind::Int(lit, rustc_ast::LitIntType::Unsuffixed),
+                span,
+            }) => {
+                let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span) else { return false; };
+                if !(snippet.starts_with("0x") || snippet.starts_with("0X")) {
+                    return false;
+                }
+                if snippet.len() <= 5 || !snippet.is_char_boundary(snippet.len() - 3) {
+                    return false;
+                }
+                let (_, suffix) = snippet.split_at(snippet.len() - 3);
+                let value = match suffix {
+                    "f32" => (lit - 0xf32) / (16 * 16 * 16),
+                    "f64" => (lit - 0xf64) / (16 * 16 * 16),
+                    _ => return false,
+                };
+                err.span_suggestions(
+                    expr.span,
+                    "rewrite this as a decimal floating point literal, or use `as` to turn a hex literal into a float",
+                    [format!("0x{value:X} as {suffix}"), format!("{value}_{suffix}")],
+                    Applicability::MaybeIncorrect,
+                );
+                true
+            }
             _ => false,
         }
     }