Auto merge of rust-lang#122008 - jhpratt:rollup-g08ehpt, r=jhpratt

Rollup of 15 pull requests

Successful merges:

 - rust-lang#121065 (Add basic i18n guidance for `Display`)
 - rust-lang#121202 (Limit the number of names and values in check-cfg diagnostics)
 - rust-lang#121213 (Add an example to demonstrate how Rc::into_inner works)
 - rust-lang#121262 (Add vector time complexity)
 - rust-lang#121287 (Clarify/add `must_use` message for Rc/Arc/Weak::into_raw.)
 - rust-lang#121664 (Adjust error `yield`/`await` lowering)
 - rust-lang#121838 (Use the correct logic for nested impl trait in assoc types)
 - rust-lang#121860 (Add a tidy check that checks whether the fluent slugs only appear once)
 - rust-lang#121913 (Don't panic when waiting on poisoned queries)
 - rust-lang#121959 (Removing absolute path in proc-macro)
 - rust-lang#121975 (hir_analysis: enums return `None` in `find_field`)
 - rust-lang#121978 (Fix duplicated path in the "not found dylib" error)
 - rust-lang#121987 (pattern analysis: abort on arity mismatch)
 - rust-lang#121993 (Avoid using unnecessary queries when printing the query stack in panics)
 - rust-lang#121997 (interpret/cast: make more matches on FloatTy properly exhaustive)

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

compiler/rustc_ast_lowering/src/expr.rs

@@ -760,10 +760,28 @@ impl<'hir> LoweringContext<'_, 'hir> {
             Some(hir::CoroutineKind::Coroutine(_))
             | Some(hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen, _))
             | None => {
-                return hir::ExprKind::Err(self.dcx().emit_err(AwaitOnlyInAsyncFnAndBlocks {
-                    await_kw_span,
-                    item_span: self.current_item,
-                }));
+                // Lower to a block `{ EXPR; <error> }` so that the awaited expr
+                // is not accidentally orphaned.
+                let stmt_id = self.next_id();
+                let expr_err = self.expr(
+                    expr.span,
+                    hir::ExprKind::Err(self.dcx().emit_err(AwaitOnlyInAsyncFnAndBlocks {
+                        await_kw_span,
+                        item_span: self.current_item,
+                    })),
+                );
+                return hir::ExprKind::Block(
+                    self.block_all(
+                        expr.span,
+                        arena_vec![self; hir::Stmt {
+                            hir_id: stmt_id,
+                            kind: hir::StmtKind::Semi(expr),
+                            span: expr.span,
+                        }],
+                        Some(self.arena.alloc(expr_err)),
+                    ),
+                    None,
+                );
             }
         };
 
@@ -1496,12 +1514,31 @@ impl<'hir> LoweringContext<'_, 'hir> {
     }
 
     fn lower_expr_yield(&mut self, span: Span, opt_expr: Option<&Expr>) -> hir::ExprKind<'hir> {
+        let yielded =
+            opt_expr.as_ref().map(|x| self.lower_expr(x)).unwrap_or_else(|| self.expr_unit(span));
+
         let is_async_gen = match self.coroutine_kind {
             Some(hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen, _)) => false,
             Some(hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::AsyncGen, _)) => true,
             Some(hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Async, _)) => {
-                return hir::ExprKind::Err(
-                    self.dcx().emit_err(AsyncCoroutinesNotSupported { span }),
+                // Lower to a block `{ EXPR; <error> }` so that the awaited expr
+                // is not accidentally orphaned.
+                let stmt_id = self.next_id();
+                let expr_err = self.expr(
+                    yielded.span,
+                    hir::ExprKind::Err(self.dcx().emit_err(AsyncCoroutinesNotSupported { span })),
+                );
+                return hir::ExprKind::Block(
+                    self.block_all(
+                        yielded.span,
+                        arena_vec![self; hir::Stmt {
+                            hir_id: stmt_id,
+                            kind: hir::StmtKind::Semi(yielded),
+                            span: yielded.span,
+                        }],
+                        Some(self.arena.alloc(expr_err)),
+                    ),
+                    None,
                 );
             }
             Some(hir::CoroutineKind::Coroutine(_)) => {
@@ -1531,9 +1568,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
             }
         };
 
-        let yielded =
-            opt_expr.as_ref().map(|x| self.lower_expr(x)).unwrap_or_else(|| self.expr_unit(span));
-
         if is_async_gen {
             // `yield $expr` is transformed into `task_context = yield async_gen_ready($expr)`.
             // This ensures that we store our resumed `ResumeContext` correctly, and also that

compiler/rustc_const_eval/messages.ftl

@@ -146,9 +146,6 @@ const_eval_intern_kind = {$kind ->
     *[other] {""}
 }
 
-const_eval_invalid_align =
-    align has to be a power of 2
-
 const_eval_invalid_align_details =
     invalid align passed to `{$name}`: {$align} is {$err_kind ->
         [not_power_of_two] not a power of 2

compiler/rustc_const_eval/src/interpret/cast.rs

@@ -182,13 +182,14 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>> {
         use rustc_type_ir::TyKind::*;
 
-        let val = match src.layout.ty.kind() {
-            // Floating point
-            Float(FloatTy::F32) => self.cast_from_float(src.to_scalar().to_f32()?, cast_to.ty),
-            Float(FloatTy::F64) => self.cast_from_float(src.to_scalar().to_f64()?, cast_to.ty),
-            _ => {
-                bug!("Can't cast 'Float' type into {}", cast_to.ty);
-            }
+        let Float(fty) = src.layout.ty.kind() else {
+            bug!("FloatToFloat/FloatToInt cast: source type {} is not a float type", src.layout.ty)
+        };
+        let val = match fty {
+            FloatTy::F16 => unimplemented!("f16_f128"),
+            FloatTy::F32 => self.cast_from_float(src.to_scalar().to_f32()?, cast_to.ty),
+            FloatTy::F64 => self.cast_from_float(src.to_scalar().to_f64()?, cast_to.ty),
+            FloatTy::F128 => unimplemented!("f16_f128"),
         };
         Ok(ImmTy::from_scalar(val, cast_to))
     }
@@ -275,6 +276,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         trace!("cast_from_scalar: {}, {} -> {}", v, src_layout.ty, cast_ty);
 
         Ok(match *cast_ty.kind() {
+            // int -> int
             Int(_) | Uint(_) => {
                 let size = match *cast_ty.kind() {
                     Int(t) => Integer::from_int_ty(self, t).size(),
@@ -285,15 +287,26 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 Scalar::from_uint(v, size)
             }
 
-            Float(FloatTy::F32) if signed => Scalar::from_f32(Single::from_i128(v as i128).value),
-            Float(FloatTy::F64) if signed => Scalar::from_f64(Double::from_i128(v as i128).value),
-            Float(FloatTy::F32) => Scalar::from_f32(Single::from_u128(v).value),
-            Float(FloatTy::F64) => Scalar::from_f64(Double::from_u128(v).value),
-
-            Char => {
-                // `u8` to `char` cast
-                Scalar::from_u32(u8::try_from(v).unwrap().into())
+            // signed int -> float
+            Float(fty) if signed => {
+                let v = v as i128;
+                match fty {
+                    FloatTy::F16 => unimplemented!("f16_f128"),
+                    FloatTy::F32 => Scalar::from_f32(Single::from_i128(v).value),
+                    FloatTy::F64 => Scalar::from_f64(Double::from_i128(v).value),
+                    FloatTy::F128 => unimplemented!("f16_f128"),
+                }
             }
+            // unsigned int -> float
+            Float(fty) => match fty {
+                FloatTy::F16 => unimplemented!("f16_f128"),
+                FloatTy::F32 => Scalar::from_f32(Single::from_u128(v).value),
+                FloatTy::F64 => Scalar::from_f64(Double::from_u128(v).value),
+                FloatTy::F128 => unimplemented!("f16_f128"),
+            },
+
+            // u8 -> char
+            Char => Scalar::from_u32(u8::try_from(v).unwrap().into()),
 
             // Casts to bool are not permitted by rustc, no need to handle them here.
             _ => span_bug!(self.cur_span(), "invalid int to {} cast", cast_ty),
@@ -339,14 +352,13 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let v = f.to_i128(size.bits_usize()).value;
                 Scalar::from_int(v, size)
             }
-            // float -> f32
-            Float(FloatTy::F32) => {
-                Scalar::from_f32(adjust_nan(self, f, f.convert(&mut false).value))
-            }
-            // float -> f64
-            Float(FloatTy::F64) => {
-                Scalar::from_f64(adjust_nan(self, f, f.convert(&mut false).value))
-            }
+            // float -> float
+            Float(fty) => match fty {
+                FloatTy::F16 => unimplemented!("f16_f128"),
+                FloatTy::F32 => Scalar::from_f32(adjust_nan(self, f, f.convert(&mut false).value)),
+                FloatTy::F64 => Scalar::from_f64(adjust_nan(self, f, f.convert(&mut false).value)),
+                FloatTy::F128 => unimplemented!("f16_f128"),
+            },
             // That's it.
             _ => span_bug!(self.cur_span(), "invalid float to {} cast", dest_ty),
         }

compiler/rustc_hir_analysis/src/collect.rs

@@ -791,7 +791,12 @@ fn convert_enum_variant_types(tcx: TyCtxt<'_>, def_id: DefId) {
 }
 
 fn find_field(tcx: TyCtxt<'_>, (def_id, ident): (DefId, Ident)) -> Option<FieldIdx> {
-    tcx.adt_def(def_id).non_enum_variant().fields.iter_enumerated().find_map(|(idx, field)| {
+    let adt = tcx.adt_def(def_id);
+    if adt.is_enum() {
+        return None;
+    }
+
+    adt.non_enum_variant().fields.iter_enumerated().find_map(|(idx, field)| {
         if field.is_unnamed() {
             let field_ty = tcx.type_of(field.did).instantiate_identity();
             let adt_def = field_ty.ty_adt_def().expect("expect Adt for unnamed field");

compiler/rustc_infer/messages.ftl

@@ -181,14 +181,6 @@ infer_more_targeted = {$has_param_name ->
 
 infer_msl_introduces_static = introduces a `'static` lifetime requirement
 infer_msl_unmet_req = because this has an unmet lifetime requirement
-infer_need_type_info_in_coroutine =
-    type inside {$coroutine_kind ->
-    [async_block] `async` block
-    [async_closure] `async` closure
-    [async_fn] `async fn` body
-    *[coroutine] coroutine
-    } must be known in this context
-
 
 infer_nothing = {""}
 

compiler/rustc_lint/messages.ftl

@@ -562,8 +562,6 @@ lint_suspicious_double_ref_clone =
 lint_suspicious_double_ref_deref =
     using `.deref()` on a double reference, which returns `{$ty}` instead of dereferencing the inner type
 
-lint_trivial_untranslatable_diag = diagnostic with static strings only
-
 lint_ty_qualified = usage of qualified `ty::{$ty}`
     .suggestion = try importing it and using it unqualified
 

compiler/rustc_lint/src/context/diagnostics.rs

@@ -12,6 +12,43 @@ use rustc_span::edit_distance::find_best_match_for_name;
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::BytePos;
 
+const MAX_CHECK_CFG_NAMES_OR_VALUES: usize = 35;
+
+fn check_cfg_expected_note(
+    sess: &Session,
+    possibilities: &[Symbol],
+    type_: &str,
+    name: Option<Symbol>,
+    suffix: &str,
+) -> String {
+    use std::fmt::Write;
+
+    let n_possibilities = if sess.opts.unstable_opts.check_cfg_all_expected {
+        possibilities.len()
+    } else {
+        std::cmp::min(possibilities.len(), MAX_CHECK_CFG_NAMES_OR_VALUES)
+    };
+
+    let mut possibilities = possibilities.iter().map(Symbol::as_str).collect::<Vec<_>>();
+    possibilities.sort();
+
+    let and_more = possibilities.len().saturating_sub(n_possibilities);
+    let possibilities = possibilities[..n_possibilities].join("`, `");
+
+    let mut note = String::with_capacity(50 + possibilities.len());
+
+    write!(&mut note, "expected {type_}").unwrap();
+    if let Some(name) = name {
+        write!(&mut note, " for `{name}`").unwrap();
+    }
+    write!(&mut note, " are: {suffix}`{possibilities}`").unwrap();
+    if and_more > 0 {
+        write!(&mut note, " and {and_more} more").unwrap();
+    }
+
+    note
+}
+
 pub(super) fn builtin(sess: &Session, diagnostic: BuiltinLintDiagnostics, diag: &mut Diag<'_, ()>) {
     match diagnostic {
         BuiltinLintDiagnostics::UnicodeTextFlow(span, content) => {
@@ -291,16 +328,13 @@ pub(super) fn builtin(sess: &Session, diagnostic: BuiltinLintDiagnostics, diag:
                     }
                 }
                 if !possibilities.is_empty() {
-                    let mut possibilities =
-                        possibilities.iter().map(Symbol::as_str).collect::<Vec<_>>();
-                    possibilities.sort();
-                    let possibilities = possibilities.join("`, `");
-
-                    // The list of expected names can be long (even by default) and
-                    // so the diagnostic produced can take a lot of space. To avoid
-                    // cloging the user output we only want to print that diagnostic
-                    // once.
-                    diag.help_once(format!("expected names are: `{possibilities}`"));
+                    diag.help_once(check_cfg_expected_note(
+                        sess,
+                        &possibilities,
+                        "names",
+                        None,
+                        "",
+                    ));
                 }
             }
 
@@ -343,16 +377,13 @@ pub(super) fn builtin(sess: &Session, diagnostic: BuiltinLintDiagnostics, diag:
             // Show the full list if all possible values for a given name, but don't do it
             // for names as the possibilities could be very long
             if !possibilities.is_empty() {
-                {
-                    let mut possibilities =
-                        possibilities.iter().map(Symbol::as_str).collect::<Vec<_>>();
-                    possibilities.sort();
-
-                    let possibilities = possibilities.join("`, `");
-                    let none = if have_none_possibility { "(none), " } else { "" };
-
-                    diag.note(format!("expected values for `{name}` are: {none}`{possibilities}`"));
-                }
+                diag.note(check_cfg_expected_note(
+                    sess,
+                    &possibilities,
+                    "values",
+                    Some(name),
+                    if have_none_possibility { "(none), " } else { "" },
+                ));
 
                 if let Some((value, value_span)) = value {
                     // Suggest the most probable if we found one

compiler/rustc_metadata/src/creader.rs

@@ -1132,7 +1132,13 @@ fn load_dylib(path: &Path, max_attempts: usize) -> Result<libloading::Library, S
             Err(err) => {
                 // Only try to recover from this specific error.
                 if !matches!(err, libloading::Error::LoadLibraryExW { .. }) {
-                    return Err(err.to_string());
+                    let err = format_dlopen_err(&err);
+                    // We include the path of the dylib in the error ourselves, so
+                    // if it's in the error, we strip it.
+                    if let Some(err) = err.strip_prefix(&format!(": {}", path.display())) {
+                        return Err(err.to_string());
+                    }
+                    return Err(err);
                 }
 
                 last_error = Some(err);

compiler/rustc_parse/messages.ftl

@@ -392,9 +392,6 @@ parse_invalid_identifier_with_leading_number = identifiers cannot start with a n
 
 parse_invalid_interpolated_expression = invalid interpolated expression
 
-parse_invalid_literal_suffix = suffixes on {$kind} literals are invalid
-    .label = invalid suffix `{$suffix}`
-
 parse_invalid_literal_suffix_on_tuple_index = suffixes on a tuple index are invalid
     .label = invalid suffix `{$suffix}`
     .tuple_exception_line_1 = `{$suffix}` is *temporarily* accepted on tuple index fields as it was incorrectly accepted on stable for a few releases
@@ -609,7 +606,6 @@ parse_nonterminal_expected_item_keyword = expected an item keyword
 parse_nonterminal_expected_lifetime = expected a lifetime, found `{$token}`
 
 parse_nonterminal_expected_statement = expected a statement
-parse_not_supported = not supported
 
 parse_note_edition_guide = for more on editions, read https://doc.rust-lang.org/edition-guide
 

compiler/rustc_passes/messages.ftl

@@ -302,9 +302,6 @@ passes_export_name =
     attribute should be applied to a free function, impl method or static
     .label = not a free function, impl method or static
 
-passes_expr_not_allowed_in_context =
-    {$expr} is not allowed in a `{$context}`
-
 passes_extern_main =
     the `main` function cannot be declared in an `extern` block
 
@@ -405,8 +402,6 @@ passes_lang_item_on_incorrect_target =
     `{$name}` language item must be applied to a {$expected_target}
     .label = attribute should be applied to a {$expected_target}, not a {$actual_target}
 
-passes_layout =
-    layout error: {$layout_error}
 passes_layout_abi =
     abi: {$abi}
 passes_layout_align =