1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Implementation of lint checking.
13 //! The lint checking is mostly consolidated into one pass which runs just
14 //! before translation to LLVM bytecode. Throughout compilation, lint warnings
15 //! can be added via the `add_lint` method on the Session structure. This
16 //! requires a span and an id of the node that the lint is being added to. The
17 //! lint isn't actually emitted at that time because it is unknown what the
18 //! actual lint level at that location is.
20 //! To actually emit lint warnings/errors, a separate pass is used just before
21 //! translation. A context keeps track of the current state of all lint levels.
22 //! Upon entering a node of the ast which can modify the lint settings, the
23 //! previous lint state is pushed onto a stack and the ast is then recursed
24 //! upon. As the ast is traversed, this keeps track of the current lint level
25 //! for all lint attributes.
26 use self::TargetLint::*;
28 use middle::privacy::ExportedItems;
29 use middle::ty::{self, Ty};
30 use session::{early_error, Session};
31 use lint::{Level, LevelSource, Lint, LintId, LintArray, LintPass, LintPassObject};
32 use lint::{Default, CommandLine, Node, Allow, Warn, Deny, Forbid};
34 use util::nodemap::FnvHashMap;
36 use std::cell::RefCell;
38 use syntax::ast_util::IdVisitingOperation;
39 use syntax::attr::AttrMetaMethods;
41 use syntax::codemap::Span;
42 use syntax::visit::{Visitor, FnKind};
43 use syntax::parse::token::InternedString;
44 use syntax::{ast, ast_util, visit};
46 /// Information about the registered lints.
48 /// This is basically the subset of `Context` that we can
49 /// build early in the compile pipeline.
50 pub struct LintStore {
51 /// Registered lints. The bool is true if the lint was
52 /// added by a plugin.
53 lints: Vec<(&'static Lint, bool)>,
55 /// Trait objects for each lint pass.
56 /// This is only `None` while iterating over the objects. See the definition
58 passes: Option<Vec<LintPassObject>>,
60 /// Lints indexed by name.
61 by_name: FnvHashMap<String, TargetLint>,
63 /// Current levels of each lint, and where they were set.
64 levels: FnvHashMap<LintId, LevelSource>,
66 /// Map of registered lint groups to what lints they expand to. The bool
67 /// is true if the lint group was added by a plugin.
68 lint_groups: FnvHashMap<&'static str, (Vec<LintId>, bool)>,
71 /// The targed of the `by_name` map, which accounts for renaming/deprecation.
73 /// A direct lint target
76 /// Temporary renaming, used for easing migration pain; see #16545
77 Renamed(String, LintId),
81 fn get_level_source(&self, lint: LintId) -> LevelSource {
82 match self.levels.get(&lint) {
84 None => (Allow, Default),
88 fn set_level(&mut self, lint: LintId, lvlsrc: LevelSource) {
89 if lvlsrc.0 == Allow {
90 self.levels.remove(&lint);
92 self.levels.insert(lint, lvlsrc);
96 pub fn new() -> LintStore {
100 by_name: FnvHashMap::new(),
101 levels: FnvHashMap::new(),
102 lint_groups: FnvHashMap::new(),
106 pub fn get_lints<'t>(&'t self) -> &'t [(&'static Lint, bool)] {
110 pub fn get_lint_groups<'t>(&'t self) -> Vec<(&'static str, Vec<LintId>, bool)> {
111 self.lint_groups.iter().map(|(k, v)| (*k,
116 pub fn register_pass(&mut self, sess: Option<&Session>,
117 from_plugin: bool, pass: LintPassObject) {
118 for &lint in pass.get_lints().iter() {
119 self.lints.push((*lint, from_plugin));
121 let id = LintId::of(*lint);
122 if self.by_name.insert(lint.name_lower(), Id(id)).is_some() {
123 let msg = format!("duplicate specification of lint {}", lint.name_lower());
124 match (sess, from_plugin) {
125 // We load builtin lints first, so a duplicate is a compiler bug.
126 // Use early_error when handling -W help with no crate.
127 (None, _) => early_error(msg[]),
128 (Some(sess), false) => sess.bug(msg[]),
130 // A duplicate name from a plugin is a user error.
131 (Some(sess), true) => sess.err(msg[]),
135 if lint.default_level != Allow {
136 self.levels.insert(id, (lint.default_level, Default));
139 self.passes.as_mut().unwrap().push(pass);
142 pub fn register_group(&mut self, sess: Option<&Session>,
143 from_plugin: bool, name: &'static str,
145 let new = self.lint_groups.insert(name, (to, from_plugin)).is_none();
148 let msg = format!("duplicate specification of lint group {}", name);
149 match (sess, from_plugin) {
150 // We load builtin lints first, so a duplicate is a compiler bug.
151 // Use early_error when handling -W help with no crate.
152 (None, _) => early_error(msg[]),
153 (Some(sess), false) => sess.bug(msg[]),
155 // A duplicate name from a plugin is a user error.
156 (Some(sess), true) => sess.err(msg[]),
161 fn register_renamed(&mut self, old_name: &str, new_name: &str) {
162 let target = match self.by_name.get(new_name) {
163 Some(&Id(lint_id)) => lint_id.clone(),
164 _ => panic!("invalid lint renaming of {} to {}", old_name, new_name)
166 self.by_name.insert(old_name.to_string(), Renamed(new_name.to_string(), target));
169 pub fn register_builtin(&mut self, sess: Option<&Session>) {
170 macro_rules! add_builtin ( ( $sess:ident, $($name:ident),*, ) => (
172 self.register_pass($sess, false, box builtin::$name as LintPassObject);
176 macro_rules! add_builtin_with_new ( ( $sess:ident, $($name:ident),*, ) => (
178 self.register_pass($sess, false, box builtin::$name::new() as LintPassObject);
182 macro_rules! add_lint_group ( ( $sess:ident, $name:expr, $($lint:ident),* ) => (
183 self.register_group($sess, false, $name, vec![$(LintId::of(builtin::$lint)),*]);
200 NonShorthandFieldPatterns,
206 MissingCopyImplementations,
209 add_builtin_with_new!(sess,
215 add_lint_group!(sess, "bad_style",
216 NON_CAMEL_CASE_TYPES, NON_SNAKE_CASE, NON_UPPER_CASE_GLOBALS);
218 add_lint_group!(sess, "unused",
219 UNUSED_IMPORTS, UNUSED_VARIABLES, UNUSED_ASSIGNMENTS, DEAD_CODE,
220 UNUSED_MUT, UNREACHABLE_CODE, UNUSED_MUST_USE,
221 UNUSED_UNSAFE, PATH_STATEMENTS);
223 // We have one lint pass defined in this module.
224 self.register_pass(sess, false, box GatherNodeLevels as LintPassObject);
226 // Insert temporary renamings for a one-time deprecation (#16545)
227 self.register_renamed("unnecessary_typecast", "unused_typecasts");
228 self.register_renamed("unsigned_negate", "unsigned_negation");
229 self.register_renamed("type_limits", "unused_comparisons");
230 self.register_renamed("type_overflow", "overflowing_literals");
231 self.register_renamed("ctypes", "improper_ctypes");
232 self.register_renamed("owned_heap_memory", "box_pointers");
233 self.register_renamed("unused_attribute", "unused_attributes");
234 self.register_renamed("path_statement", "path_statements");
235 self.register_renamed("unused_result", "unused_results");
236 self.register_renamed("non_uppercase_statics", "non_upper_case_globals");
237 self.register_renamed("unnecessary_parens", "unused_parens");
238 self.register_renamed("unnecessary_import_braces", "unused_import_braces");
239 self.register_renamed("unsafe_block", "unsafe_blocks");
240 self.register_renamed("unnecessary_allocation", "unused_allocation");
241 self.register_renamed("missing_doc", "missing_docs");
242 self.register_renamed("unused_extern_crate", "unused_extern_crates");
243 self.register_renamed("unnecessary_qualification", "unused_qualifications");
244 self.register_renamed("unrecognized_lint", "unknown_lints");
245 self.register_renamed("unused_variable", "unused_variables");
246 self.register_renamed("dead_assignment", "unused_assignments");
247 self.register_renamed("unknown_crate_type", "unknown_crate_types");
248 self.register_renamed("variant_size_difference", "variant_size_differences");
249 self.register_renamed("transmute_fat_ptr", "fat_ptr_transmutes");
253 #[allow(unused_variables)]
254 fn find_lint(&self, lint_name: &str, sess: &Session, span: Option<Span>)
257 match self.by_name.get(lint_name) {
258 Some(&Id(lint_id)) => Some(lint_id),
259 Some(&Renamed(ref new_name, lint_id)) => {
260 let warning = format!("lint {} has been renamed to {}",
261 lint_name, new_name);
263 Some(span) => sess.span_warn(span, warning[]),
264 None => sess.warn(warning[]),
272 pub fn process_command_line(&mut self, sess: &Session) {
273 for &(ref lint_name, level) in sess.opts.lint_opts.iter() {
274 match self.find_lint(lint_name[], sess, None) {
275 Some(lint_id) => self.set_level(lint_id, (level, CommandLine)),
277 match self.lint_groups.iter().map(|(&x, pair)| (x, pair.0.clone()))
278 .collect::<FnvHashMap<&'static str,
283 .map(|lint_id: &LintId|
284 self.set_level(*lint_id, (level, CommandLine)))
285 .collect::<Vec<()>>();
287 None => sess.err(format!("unknown {} flag: {}",
288 level.as_str(), lint_name)[]),
296 /// Context for lint checking.
297 pub struct Context<'a, 'tcx: 'a> {
298 /// Type context we're checking in.
299 pub tcx: &'a ty::ctxt<'tcx>,
301 /// The crate being checked.
302 pub krate: &'a ast::Crate,
304 /// Items exported from the crate being checked.
305 pub exported_items: &'a ExportedItems,
307 /// The store of registered lints.
310 /// When recursing into an attributed node of the ast which modifies lint
311 /// levels, this stack keeps track of the previous lint levels of whatever
313 level_stack: Vec<(LintId, LevelSource)>,
315 /// Level of lints for certain NodeIds, stored here because the body of
316 /// the lint needs to run in trans.
317 node_levels: RefCell<FnvHashMap<(ast::NodeId, LintId), LevelSource>>,
320 /// Convenience macro for calling a `LintPass` method on every pass in the context.
321 macro_rules! run_lints { ($cx:expr, $f:ident, $($args:expr),*) => ({
322 // Move the vector of passes out of `$cx` so that we can
323 // iterate over it mutably while passing `$cx` to the methods.
324 let mut passes = $cx.lints.passes.take().unwrap();
325 for obj in passes.iter_mut() {
326 obj.$f($cx, $($args),*);
328 $cx.lints.passes = Some(passes);
331 /// Parse the lint attributes into a vector, with `Err`s for malformed lint
332 /// attributes. Writing this as an iterator is an enormous mess.
333 pub fn gather_attrs(attrs: &[ast::Attribute])
334 -> Vec<Result<(InternedString, Level, Span), Span>> {
335 let mut out = vec!();
336 for attr in attrs.iter() {
337 let level = match Level::from_str(attr.name().get()) {
342 attr::mark_used(attr);
344 let meta = &attr.node.value;
345 let metas = match meta.node {
346 ast::MetaList(_, ref metas) => metas,
348 out.push(Err(meta.span));
353 for meta in metas.iter() {
354 out.push(match meta.node {
355 ast::MetaWord(ref lint_name) => Ok((lint_name.clone(), level, meta.span)),
363 /// Emit a lint as a warning or an error (or not at all)
364 /// according to `level`.
366 /// This lives outside of `Context` so it can be used by checks
367 /// in trans that run after the main lint pass is finished. Most
368 /// lints elsewhere in the compiler should call
369 /// `Session::add_lint()` instead.
370 pub fn raw_emit_lint(sess: &Session, lint: &'static Lint,
371 lvlsrc: LevelSource, span: Option<Span>, msg: &str) {
372 let (mut level, source) = lvlsrc;
373 if level == Allow { return }
375 let name = lint.name_lower();
377 let msg = match source {
379 format!("{}, #[{}({})] on by default", msg,
380 level.as_str(), name)
383 format!("{} [-{} {}]", msg,
385 Warn => 'W', Deny => 'D', Forbid => 'F',
387 }, name.replace("_", "-"))
395 // For purposes of printing, we can treat forbid as deny.
396 if level == Forbid { level = Deny; }
398 match (level, span) {
399 (Warn, Some(sp)) => sess.span_warn(sp, msg[]),
400 (Warn, None) => sess.warn(msg[]),
401 (Deny, Some(sp)) => sess.span_err(sp, msg[]),
402 (Deny, None) => sess.err(msg[]),
403 _ => sess.bug("impossible level in raw_emit_lint"),
406 for span in note.into_iter() {
407 sess.span_note(span, "lint level defined here");
411 impl<'a, 'tcx> Context<'a, 'tcx> {
412 fn new(tcx: &'a ty::ctxt<'tcx>,
413 krate: &'a ast::Crate,
414 exported_items: &'a ExportedItems) -> Context<'a, 'tcx> {
415 // We want to own the lint store, so move it out of the session.
416 let lint_store = mem::replace(&mut *tcx.sess.lint_store.borrow_mut(),
422 exported_items: exported_items,
425 node_levels: RefCell::new(FnvHashMap::new()),
429 /// Get the overall compiler `Session` object.
430 pub fn sess(&'a self) -> &'a Session {
434 /// Get the level of `lint` at the current position of the lint
436 pub fn current_level(&self, lint: &'static Lint) -> Level {
437 self.lints.levels.get(&LintId::of(lint)).map_or(Allow, |&(lvl, _)| lvl)
440 fn lookup_and_emit(&self, lint: &'static Lint, span: Option<Span>, msg: &str) {
441 let (level, src) = match self.lints.levels.get(&LintId::of(lint)) {
443 Some(&(Warn, src)) => {
444 let lint_id = LintId::of(builtin::WARNINGS);
445 (self.lints.get_level_source(lint_id).0, src)
450 raw_emit_lint(&self.tcx.sess, lint, (level, src), span, msg);
453 /// Emit a lint at the appropriate level, with no associated span.
454 pub fn lint(&self, lint: &'static Lint, msg: &str) {
455 self.lookup_and_emit(lint, None, msg);
458 /// Emit a lint at the appropriate level, for a particular span.
459 pub fn span_lint(&self, lint: &'static Lint, span: Span, msg: &str) {
460 self.lookup_and_emit(lint, Some(span), msg);
463 /// Merge the lints specified by any lint attributes into the
464 /// current lint context, call the provided function, then reset the
465 /// lints in effect to their previous state.
466 fn with_lint_attrs<F>(&mut self,
467 attrs: &[ast::Attribute],
469 F: FnOnce(&mut Context),
471 // Parse all of the lint attributes, and then add them all to the
472 // current dictionary of lint information. Along the way, keep a history
473 // of what we changed so we can roll everything back after invoking the
477 for result in gather_attrs(attrs).into_iter() {
478 let v = match result {
480 self.tcx.sess.span_err(span, "malformed lint attribute");
483 Ok((lint_name, level, span)) => {
484 match self.lints.find_lint(lint_name.get(), &self.tcx.sess, Some(span)) {
485 Some(lint_id) => vec![(lint_id, level, span)],
487 match self.lints.lint_groups.get(lint_name.get()) {
488 Some(&(ref v, _)) => v.iter()
489 .map(|lint_id: &LintId|
490 (*lint_id, level, span))
493 self.span_lint(builtin::UNKNOWN_LINTS, span,
494 format!("unknown `{}` attribute: `{}`",
495 level.as_str(), lint_name)[]);
504 for (lint_id, level, span) in v.into_iter() {
505 let now = self.lints.get_level_source(lint_id).0;
506 if now == Forbid && level != Forbid {
507 let lint_name = lint_id.as_str();
508 self.tcx.sess.span_err(span,
509 format!("{}({}) overruled by outer forbid({})",
510 level.as_str(), lint_name,
512 } else if now != level {
513 let src = self.lints.get_level_source(lint_id).1;
514 self.level_stack.push((lint_id, (now, src)));
516 self.lints.set_level(lint_id, (level, Node(span)));
521 run_lints!(self, enter_lint_attrs, attrs);
523 run_lints!(self, exit_lint_attrs, attrs);
526 for _ in range(0, pushed) {
527 let (lint, lvlsrc) = self.level_stack.pop().unwrap();
528 self.lints.set_level(lint, lvlsrc);
532 fn visit_ids<F>(&mut self, f: F) where
533 F: FnOnce(&mut ast_util::IdVisitor<Context>)
535 let mut v = ast_util::IdVisitor {
537 pass_through_items: false,
538 visited_outermost: false,
544 impl<'a, 'tcx, 'v> Visitor<'v> for Context<'a, 'tcx> {
545 fn visit_item(&mut self, it: &ast::Item) {
546 self.with_lint_attrs(it.attrs[], |cx| {
547 run_lints!(cx, check_item, it);
548 cx.visit_ids(|v| v.visit_item(it));
549 visit::walk_item(cx, it);
553 fn visit_foreign_item(&mut self, it: &ast::ForeignItem) {
554 self.with_lint_attrs(it.attrs[], |cx| {
555 run_lints!(cx, check_foreign_item, it);
556 visit::walk_foreign_item(cx, it);
560 fn visit_view_item(&mut self, i: &ast::ViewItem) {
561 self.with_lint_attrs(i.attrs[], |cx| {
562 run_lints!(cx, check_view_item, i);
563 cx.visit_ids(|v| v.visit_view_item(i));
564 visit::walk_view_item(cx, i);
568 fn visit_pat(&mut self, p: &ast::Pat) {
569 run_lints!(self, check_pat, p);
570 visit::walk_pat(self, p);
573 fn visit_expr(&mut self, e: &ast::Expr) {
574 run_lints!(self, check_expr, e);
575 visit::walk_expr(self, e);
578 fn visit_stmt(&mut self, s: &ast::Stmt) {
579 run_lints!(self, check_stmt, s);
580 visit::walk_stmt(self, s);
583 fn visit_fn(&mut self, fk: FnKind<'v>, decl: &'v ast::FnDecl,
584 body: &'v ast::Block, span: Span, id: ast::NodeId) {
586 visit::FkMethod(_, _, m) => {
587 self.with_lint_attrs(m.attrs[], |cx| {
588 run_lints!(cx, check_fn, fk, decl, body, span, id);
590 v.visit_fn(fk, decl, body, span, id);
592 visit::walk_fn(cx, fk, decl, body, span);
596 run_lints!(self, check_fn, fk, decl, body, span, id);
597 visit::walk_fn(self, fk, decl, body, span);
602 fn visit_ty_method(&mut self, t: &ast::TypeMethod) {
603 self.with_lint_attrs(t.attrs[], |cx| {
604 run_lints!(cx, check_ty_method, t);
605 visit::walk_ty_method(cx, t);
609 fn visit_struct_def(&mut self,
614 run_lints!(self, check_struct_def, s, ident, g, id);
615 visit::walk_struct_def(self, s);
616 run_lints!(self, check_struct_def_post, s, ident, g, id);
619 fn visit_struct_field(&mut self, s: &ast::StructField) {
620 self.with_lint_attrs(s.node.attrs[], |cx| {
621 run_lints!(cx, check_struct_field, s);
622 visit::walk_struct_field(cx, s);
626 fn visit_variant(&mut self, v: &ast::Variant, g: &ast::Generics) {
627 self.with_lint_attrs(v.node.attrs[], |cx| {
628 run_lints!(cx, check_variant, v, g);
629 visit::walk_variant(cx, v, g);
630 run_lints!(cx, check_variant_post, v, g);
634 // FIXME(#10894) should continue recursing
635 fn visit_ty(&mut self, t: &ast::Ty) {
636 run_lints!(self, check_ty, t);
639 fn visit_ident(&mut self, sp: Span, id: ast::Ident) {
640 run_lints!(self, check_ident, sp, id);
643 fn visit_mod(&mut self, m: &ast::Mod, s: Span, n: ast::NodeId) {
644 run_lints!(self, check_mod, m, s, n);
645 visit::walk_mod(self, m);
648 fn visit_local(&mut self, l: &ast::Local) {
649 run_lints!(self, check_local, l);
650 visit::walk_local(self, l);
653 fn visit_block(&mut self, b: &ast::Block) {
654 run_lints!(self, check_block, b);
655 visit::walk_block(self, b);
658 fn visit_arm(&mut self, a: &ast::Arm) {
659 run_lints!(self, check_arm, a);
660 visit::walk_arm(self, a);
663 fn visit_decl(&mut self, d: &ast::Decl) {
664 run_lints!(self, check_decl, d);
665 visit::walk_decl(self, d);
668 fn visit_expr_post(&mut self, e: &ast::Expr) {
669 run_lints!(self, check_expr_post, e);
672 fn visit_generics(&mut self, g: &ast::Generics) {
673 run_lints!(self, check_generics, g);
674 visit::walk_generics(self, g);
677 fn visit_trait_item(&mut self, m: &ast::TraitItem) {
678 run_lints!(self, check_trait_method, m);
679 visit::walk_trait_item(self, m);
682 fn visit_opt_lifetime_ref(&mut self, sp: Span, lt: &Option<ast::Lifetime>) {
683 run_lints!(self, check_opt_lifetime_ref, sp, lt);
686 fn visit_lifetime_ref(&mut self, lt: &ast::Lifetime) {
687 run_lints!(self, check_lifetime_ref, lt);
690 fn visit_lifetime_def(&mut self, lt: &ast::LifetimeDef) {
691 run_lints!(self, check_lifetime_def, lt);
694 fn visit_explicit_self(&mut self, es: &ast::ExplicitSelf) {
695 run_lints!(self, check_explicit_self, es);
696 visit::walk_explicit_self(self, es);
699 fn visit_mac(&mut self, mac: &ast::Mac) {
700 run_lints!(self, check_mac, mac);
701 visit::walk_mac(self, mac);
704 fn visit_path(&mut self, p: &ast::Path, id: ast::NodeId) {
705 run_lints!(self, check_path, p, id);
706 visit::walk_path(self, p);
709 fn visit_attribute(&mut self, attr: &ast::Attribute) {
710 run_lints!(self, check_attribute, attr);
714 // Output any lints that were previously added to the session.
715 impl<'a, 'tcx> IdVisitingOperation for Context<'a, 'tcx> {
716 fn visit_id(&mut self, id: ast::NodeId) {
717 match self.tcx.sess.lints.borrow_mut().remove(&id) {
720 for (lint_id, span, msg) in lints.into_iter() {
721 self.span_lint(lint_id.lint, span, msg[])
728 // This lint pass is defined here because it touches parts of the `Context`
729 // that we don't want to expose. It records the lint level at certain AST
730 // nodes, so that the variant size difference check in trans can call
733 struct GatherNodeLevels;
735 impl LintPass for GatherNodeLevels {
736 fn get_lints(&self) -> LintArray {
740 fn check_item(&mut self, cx: &Context, it: &ast::Item) {
742 ast::ItemEnum(..) => {
743 let lint_id = LintId::of(builtin::VARIANT_SIZE_DIFFERENCES);
744 let lvlsrc = cx.lints.get_level_source(lint_id);
746 (lvl, _) if lvl != Allow => {
747 cx.node_levels.borrow_mut()
748 .insert((it.id, lint_id), lvlsrc);
758 /// Perform lint checking on a crate.
760 /// Consumes the `lint_store` field of the `Session`.
761 pub fn check_crate(tcx: &ty::ctxt,
762 exported_items: &ExportedItems) {
763 let krate = tcx.map.krate();
764 let mut cx = Context::new(tcx, krate, exported_items);
766 // Visit the whole crate.
767 cx.with_lint_attrs(krate.attrs[], |cx| {
768 cx.visit_id(ast::CRATE_NODE_ID);
770 v.visited_outermost = true;
771 visit::walk_crate(v, krate);
774 // since the root module isn't visited as an item (because it isn't an
775 // item), warn for it here.
776 run_lints!(cx, check_crate, krate);
778 visit::walk_crate(cx, krate);
781 // If we missed any lints added to the session, then there's a bug somewhere
782 // in the iteration code.
783 for (id, v) in tcx.sess.lints.borrow().iter() {
784 for &(lint, span, ref msg) in v.iter() {
785 tcx.sess.span_bug(span,
786 format!("unprocessed lint {} at {}: {}",
787 lint.as_str(), tcx.map.node_to_string(*id), *msg)[])
791 tcx.sess.abort_if_errors();
792 *tcx.node_lint_levels.borrow_mut() = cx.node_levels.into_inner();