Rollup of 8 pull requests

compiler/rustc/build.rs

@@ -5,6 +5,9 @@ fn main() {
     let target_env = env::var("CARGO_CFG_TARGET_ENV");
     if Ok("windows") == target_os.as_deref() && Ok("msvc") == target_env.as_deref() {
         set_windows_exe_options();
+    } else {
+        // Avoid rerunning the build script every time.
+        println!("cargo:rerun-if-changed=build.rs");
     }
 }
 

compiler/rustc_errors/src/diagnostic.rs

@@ -614,6 +614,14 @@ impl Diagnostic {
         self
     }
 
+    /// Clear any existing suggestions.
+    pub fn clear_suggestions(&mut self) -> &mut Self {
+        if let Ok(suggestions) = &mut self.suggestions {
+            suggestions.clear();
+        }
+        self
+    }
+
     /// Helper for pushing to `self.suggestions`, if available (not disable).
     fn push_suggestion(&mut self, suggestion: CodeSuggestion) {
         if let Ok(suggestions) = &mut self.suggestions {

compiler/rustc_errors/src/diagnostic_builder.rs

@@ -461,6 +461,7 @@ impl<'a, G: EmissionGuarantee> DiagnosticBuilder<'a, G> {
     forward!(pub fn set_is_lint(&mut self,) -> &mut Self);
 
     forward!(pub fn disable_suggestions(&mut self,) -> &mut Self);
+    forward!(pub fn clear_suggestions(&mut self,) -> &mut Self);
 
     forward!(pub fn multipart_suggestion(
         &mut self,

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -2094,6 +2094,9 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
                         //    |
                         //    = note: cannot satisfy `_: Tt`
 
+                        // Clear any more general suggestions in favor of our specific one
+                        err.clear_suggestions();
+
                         err.span_suggestion_verbose(
                             span.shrink_to_hi(),
                             &format!(

compiler/rustc_typeck/src/check/intrinsicck.rs

@@ -4,7 +4,7 @@ use rustc_errors::struct_span_err;
 use rustc_hir as hir;
 use rustc_index::vec::Idx;
 use rustc_middle::ty::layout::{LayoutError, SizeSkeleton};
-use rustc_middle::ty::{self, Article, FloatTy, InferTy, IntTy, Ty, TyCtxt, TypeVisitable, UintTy};
+use rustc_middle::ty::{self, Article, FloatTy, IntTy, Ty, TyCtxt, TypeVisitable, UintTy};
 use rustc_session::lint;
 use rustc_span::{Span, Symbol, DUMMY_SP};
 use rustc_target::abi::{Pointer, VariantIdx};
@@ -99,8 +99,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         err.emit();
     }
 
+    // FIXME(compiler-errors): This could use `<$ty as Pointee>::Metadata == ()`
     fn is_thin_ptr_ty(&self, ty: Ty<'tcx>) -> bool {
-        if ty.is_sized(self.tcx.at(DUMMY_SP), self.param_env) {
+        // Type still may have region variables, but `Sized` does not depend
+        // on those, so just erase them before querying.
+        if self.tcx.erase_regions(ty).is_sized(self.tcx.at(DUMMY_SP), self.param_env) {
             return true;
         }
         if let ty::Foreign(..) = ty.kind() {
@@ -128,30 +131,23 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             64 => InlineAsmType::I64,
             _ => unreachable!(),
         };
+
+        // Expect types to be fully resolved, no const or type variables.
+        if ty.has_infer_types_or_consts() {
+            assert!(self.is_tainted_by_errors());
+            return None;
+        }
+
         let asm_ty = match *ty.kind() {
             // `!` is allowed for input but not for output (issue #87802)
             ty::Never if is_input => return None,
             ty::Error(_) => return None,
             ty::Int(IntTy::I8) | ty::Uint(UintTy::U8) => Some(InlineAsmType::I8),
             ty::Int(IntTy::I16) | ty::Uint(UintTy::U16) => Some(InlineAsmType::I16),
-            // Somewhat of a hack: fallback in the presence of errors does not actually
-            // fall back to i32, but to ty::Error. For integer inference variables this
-            // means that they don't get any fallback and stay as `{integer}`.
-            // Since compilation can't succeed anyway, it's fine to use this to avoid printing
-            // "cannot use value of type `{integer}`", even though that would absolutely
-            // work due due i32 fallback if the current function had no other errors.
-            ty::Infer(InferTy::IntVar(_)) => {
-                assert!(self.is_tainted_by_errors());
-                Some(InlineAsmType::I32)
-            }
             ty::Int(IntTy::I32) | ty::Uint(UintTy::U32) => Some(InlineAsmType::I32),
             ty::Int(IntTy::I64) | ty::Uint(UintTy::U64) => Some(InlineAsmType::I64),
             ty::Int(IntTy::I128) | ty::Uint(UintTy::U128) => Some(InlineAsmType::I128),
             ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize) => Some(asm_ty_isize),
-            ty::Infer(InferTy::FloatVar(_)) => {
-                assert!(self.is_tainted_by_errors());
-                Some(InlineAsmType::F32)
-            }
             ty::Float(FloatTy::F32) => Some(InlineAsmType::F32),
             ty::Float(FloatTy::F64) => Some(InlineAsmType::F64),
             ty::FnPtr(_) => Some(asm_ty_isize),
@@ -191,6 +187,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     _ => None,
                 }
             }
+            ty::Infer(_) => unreachable!(),
             _ => None,
         };
         let Some(asm_ty) = asm_ty else {
@@ -204,11 +201,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             return None;
         };
 
-        if ty.has_infer_types_or_consts() {
-            assert!(self.is_tainted_by_errors());
-            return None;
-        }
-
         // Check that the type implements Copy. The only case where this can
         // possibly fail is for SIMD types which don't #[derive(Copy)].
         if !self.infcx.type_is_copy_modulo_regions(self.param_env, ty, DUMMY_SP) {

compiler/rustc_typeck/src/check/method/confirm.rs

@@ -81,11 +81,25 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         let rcvr_substs = self.fresh_receiver_substs(self_ty, &pick);
         let all_substs = self.instantiate_method_substs(&pick, segment, rcvr_substs);
 
-        debug!("all_substs={:?}", all_substs);
+        debug!("rcvr_substs={rcvr_substs:?}, all_substs={all_substs:?}");
 
         // Create the final signature for the method, replacing late-bound regions.
         let (method_sig, method_predicates) = self.instantiate_method_sig(&pick, all_substs);
 
+        // If there is a `Self: Sized` bound and `Self` is a trait object, it is possible that
+        // something which derefs to `Self` actually implements the trait and the caller
+        // wanted to make a static dispatch on it but forgot to import the trait.
+        // See test `src/test/ui/issue-35976.rs`.
+        //
+        // In that case, we'll error anyway, but we'll also re-run the search with all traits
+        // in scope, and if we find another method which can be used, we'll output an
+        // appropriate hint suggesting to import the trait.
+        let filler_substs = rcvr_substs
+            .extend_to(self.tcx, pick.item.def_id, |def, _| self.tcx.mk_param_from_def(def));
+        let illegal_sized_bound = self.predicates_require_illegal_sized_bound(
+            &self.tcx.predicates_of(pick.item.def_id).instantiate(self.tcx, filler_substs),
+        );
+
         // Unify the (adjusted) self type with what the method expects.
         //
         // SUBTLE: if we want good error messages, because of "guessing" while matching
@@ -106,16 +120,6 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         // Make sure nobody calls `drop()` explicitly.
         self.enforce_illegal_method_limitations(&pick);
 
-        // If there is a `Self: Sized` bound and `Self` is a trait object, it is possible that
-        // something which derefs to `Self` actually implements the trait and the caller
-        // wanted to make a static dispatch on it but forgot to import the trait.
-        // See test `src/test/ui/issue-35976.rs`.
-        //
-        // In that case, we'll error anyway, but we'll also re-run the search with all traits
-        // in scope, and if we find another method which can be used, we'll output an
-        // appropriate hint suggesting to import the trait.
-        let illegal_sized_bound = self.predicates_require_illegal_sized_bound(&method_predicates);
-
         // Add any trait/regions obligations specified on the method's type parameters.
         // We won't add these if we encountered an illegal sized bound, so that we can use
         // a custom error in that case.

compiler/rustc_typeck/src/check/method/mod.rs

@@ -20,8 +20,8 @@ use rustc_hir::def_id::DefId;
 use rustc_infer::infer::{self, InferOk};
 use rustc_middle::ty::subst::Subst;
 use rustc_middle::ty::subst::{InternalSubsts, SubstsRef};
-use rustc_middle::ty::GenericParamDefKind;
 use rustc_middle::ty::{self, ToPredicate, Ty, TypeVisitable};
+use rustc_middle::ty::{DefIdTree, GenericParamDefKind};
 use rustc_span::symbol::Ident;
 use rustc_span::Span;
 use rustc_trait_selection::traits;
@@ -221,7 +221,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
 
             // We probe again, taking all traits into account (not only those in scope).
-            let candidates = match self.lookup_probe(
+            let mut candidates = match self.lookup_probe(
                 span,
                 segment.ident,
                 self_ty,
@@ -243,6 +243,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     .collect(),
                 _ => Vec::new(),
             };
+            candidates.retain(|candidate| *candidate != self.tcx.parent(result.callee.def_id));
 
             return Err(IllegalSizedBound(candidates, needs_mut, span));
         }

src/bootstrap/check.rs

@@ -20,7 +20,15 @@ fn args(builder: &Builder<'_>) -> Vec<String> {
         arr.iter().copied().map(String::from)
     }
 
-    if let Subcommand::Clippy { fix, .. } = builder.config.cmd {
+    if let Subcommand::Clippy {
+        fix,
+        clippy_lint_allow,
+        clippy_lint_deny,
+        clippy_lint_warn,
+        clippy_lint_forbid,
+        ..
+    } = &builder.config.cmd
+    {
         // disable the most spammy clippy lints
         let ignored_lints = vec![
             "many_single_char_names", // there are a lot in stdarch
@@ -32,7 +40,7 @@ fn args(builder: &Builder<'_>) -> Vec<String> {
             "wrong_self_convention",
         ];
         let mut args = vec![];
-        if fix {
+        if *fix {
             #[rustfmt::skip]
             args.extend(strings(&[
                 "--fix", "-Zunstable-options",
@@ -44,6 +52,12 @@ fn args(builder: &Builder<'_>) -> Vec<String> {
         }
         args.extend(strings(&["--", "--cap-lints", "warn"]));
         args.extend(ignored_lints.iter().map(|lint| format!("-Aclippy::{}", lint)));
+        let mut clippy_lint_levels: Vec<String> = Vec::new();
+        clippy_lint_allow.iter().for_each(|v| clippy_lint_levels.push(format!("-A{}", v)));
+        clippy_lint_deny.iter().for_each(|v| clippy_lint_levels.push(format!("-D{}", v)));
+        clippy_lint_warn.iter().for_each(|v| clippy_lint_levels.push(format!("-W{}", v)));
+        clippy_lint_forbid.iter().for_each(|v| clippy_lint_levels.push(format!("-F{}", v)));
+        args.extend(clippy_lint_levels);
         args
     } else {
         vec![]

src/bootstrap/flags.rs

@@ -91,6 +91,10 @@ pub enum Subcommand {
     Clippy {
         fix: bool,
         paths: Vec<PathBuf>,
+        clippy_lint_allow: Vec<String>,
+        clippy_lint_deny: Vec<String>,
+        clippy_lint_warn: Vec<String>,
+        clippy_lint_forbid: Vec<String>,
     },
     Fix {
         paths: Vec<PathBuf>,
@@ -246,6 +250,10 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`",
         opts.optopt("", "rust-profile-use", "use PGO profile for rustc build", "PROFILE");
         opts.optflag("", "llvm-profile-generate", "generate PGO profile with llvm built for rustc");
         opts.optopt("", "llvm-profile-use", "use PGO profile for llvm build", "PROFILE");
+        opts.optmulti("A", "", "allow certain clippy lints", "OPT");
+        opts.optmulti("D", "", "deny certain clippy lints", "OPT");
+        opts.optmulti("W", "", "warn about certain clippy lints", "OPT");
+        opts.optmulti("F", "", "forbid certain clippy lints", "OPT");
 
         // We can't use getopt to parse the options until we have completed specifying which
         // options are valid, but under the current implementation, some options are conditional on
@@ -544,7 +552,14 @@ Arguments:
                 }
                 Subcommand::Check { paths }
             }
-            Kind::Clippy => Subcommand::Clippy { paths, fix: matches.opt_present("fix") },
+            Kind::Clippy => Subcommand::Clippy {
+                paths,
+                fix: matches.opt_present("fix"),
+                clippy_lint_allow: matches.opt_strs("A"),
+                clippy_lint_warn: matches.opt_strs("W"),
+                clippy_lint_deny: matches.opt_strs("D"),
+                clippy_lint_forbid: matches.opt_strs("F"),
+            },
             Kind::Fix => Subcommand::Fix { paths },
             Kind::Test => Subcommand::Test {
                 paths,

src/librustdoc/config.rs

@@ -329,6 +329,17 @@ impl Options {
             return Err(0);
         }
 
+        let z_flags = matches.opt_strs("Z");
+        if z_flags.iter().any(|x| *x == "help") {
+            print_flag_list("-Z", config::DB_OPTIONS);
+            return Err(0);
+        }
+        let c_flags = matches.opt_strs("C");
+        if c_flags.iter().any(|x| *x == "help") {
+            print_flag_list("-C", config::CG_OPTIONS);
+            return Err(0);
+        }
+
         let color = config::parse_color(matches);
         let config::JsonConfig { json_rendered, json_unused_externs, .. } =
             config::parse_json(matches);
@@ -343,17 +354,6 @@ impl Options {
         // check for deprecated options
         check_deprecated_options(matches, &diag);
 
-        let z_flags = matches.opt_strs("Z");
-        if z_flags.iter().any(|x| *x == "help") {
-            print_flag_list("-Z", config::DB_OPTIONS);
-            return Err(0);
-        }
-        let c_flags = matches.opt_strs("C");
-        if c_flags.iter().any(|x| *x == "help") {
-            print_flag_list("-C", config::CG_OPTIONS);
-            return Err(0);
-        }
-
         if matches.opt_strs("passes") == ["list"] {
             println!("Available passes for running rustdoc:");
             for pass in passes::PASSES {

src/librustdoc/doctest.rs

@@ -726,31 +726,58 @@ fn check_if_attr_is_complete(source: &str, edition: Edition) -> bool {
         // Empty content so nothing to check in here...
         return true;
     }
-    rustc_span::create_session_if_not_set_then(edition, |_| {
-        let filename = FileName::anon_source_code(source);
-        let sess = ParseSess::with_silent_emitter(None);
-        let mut parser = match maybe_new_parser_from_source_str(&sess, filename, source.to_owned())
-        {
-            Ok(p) => p,
-            Err(_) => {
-                debug!("Cannot build a parser to check mod attr so skipping...");
-                return true;
+    rustc_driver::catch_fatal_errors(|| {
+        rustc_span::create_session_if_not_set_then(edition, |_| {
+            use rustc_errors::emitter::EmitterWriter;
+            use rustc_errors::Handler;
+            use rustc_span::source_map::FilePathMapping;
+
+            let filename = FileName::anon_source_code(source);
+            // Any errors in parsing should also appear when the doctest is compiled for real, so just
+            // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
+            let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
+            let fallback_bundle =
+                rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+
+            let emitter = EmitterWriter::new(
+                box io::sink(),
+                None,
+                None,
+                fallback_bundle,
+                false,
+                false,
+                false,
+                None,
+                false,
+            );
+
+            let handler = Handler::with_emitter(false, None, box emitter);
+            let sess = ParseSess::with_span_handler(handler, sm);
+            let mut parser =
+                match maybe_new_parser_from_source_str(&sess, filename, source.to_owned()) {
+                    Ok(p) => p,
+                    Err(_) => {
+                        debug!("Cannot build a parser to check mod attr so skipping...");
+                        return true;
+                    }
+                };
+            // If a parsing error happened, it's very likely that the attribute is incomplete.
+            if let Err(e) = parser.parse_attribute(InnerAttrPolicy::Permitted) {
+                e.cancel();
+                return false;
             }
-        };
-        // If a parsing error happened, it's very likely that the attribute is incomplete.
-        if parser.parse_attribute(InnerAttrPolicy::Permitted).is_err() {
-            return false;
-        }
-        // We now check if there is an unclosed delimiter for the attribute. To do so, we look at
-        // the `unclosed_delims` and see if the opening square bracket was closed.
-        parser
-            .unclosed_delims()
-            .get(0)
-            .map(|unclosed| {
-                unclosed.unclosed_span.map(|s| s.lo()).unwrap_or(BytePos(0)) != BytePos(2)
-            })
-            .unwrap_or(true)
+            // We now check if there is an unclosed delimiter for the attribute. To do so, we look at
+            // the `unclosed_delims` and see if the opening square bracket was closed.
+            parser
+                .unclosed_delims()
+                .get(0)
+                .map(|unclosed| {
+                    unclosed.unclosed_span.map(|s| s.lo()).unwrap_or(BytePos(0)) != BytePos(2)
+                })
+                .unwrap_or(true)
+        })
     })
+    .unwrap_or(false)
 }
 
 fn partition_source(s: &str, edition: Edition) -> (String, String, String) {

src/test/rustdoc-ui/c-help.rs

@@ -0,0 +1,4 @@
+// check-pass
+// compile-flags: -Chelp
+
+pub struct Foo;