Rollup of 7 pull requests

Cargo.lock

@@ -1564,7 +1564,7 @@ dependencies = [
  "rand_xoshiro",
  "sized-chunks",
  "typenum",
- "version_check 0.9.1",
+ "version_check",
 ]
 
 [[package]]
@@ -2014,9 +2014,9 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.2.0"
+version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2efc7bc57c883d4a4d6e3246905283d8dae951bb3bd32f49d6ef297f546e1c39"
+checksum = "53445de381a1f436797497c61d851644d0e8e88e6140f22872ad33a704933978"
 
 [[package]]
 name = "memmap"
@@ -2604,23 +2604,23 @@ dependencies = [
 
 [[package]]
 name = "pulldown-cmark"
-version = "0.5.3"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77043da1282374688ee212dc44b3f37ff929431de9c9adc3053bd3cee5630357"
+checksum = "1c205cc82214f3594e2d50686730314f817c67ffa80fe800cf0db78c3c2b9d9e"
 dependencies = [
  "bitflags",
+ "getopts",
  "memchr",
  "unicase",
 ]
 
 [[package]]
 name = "pulldown-cmark"
-version = "0.6.1"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c205cc82214f3594e2d50686730314f817c67ffa80fe800cf0db78c3c2b9d9e"
+checksum = "2c2d7fd131800e0d63df52aff46201acaab70b431a4a1ec6f0343fe8e64f35a4"
 dependencies = [
  "bitflags",
- "getopts",
  "memchr",
  "unicase",
 ]
@@ -4160,7 +4160,7 @@ version = "0.0.0"
 dependencies = [
  "itertools 0.8.0",
  "minifier",
- "pulldown-cmark 0.5.3",
+ "pulldown-cmark 0.7.0",
  "rustc-rayon",
  "serde",
  "serde_json",
@@ -5160,11 +5160,11 @@ checksum = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 
 [[package]]
 name = "unicase"
-version = "2.5.1"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e2e6bd1e59e56598518beb94fd6db628ded570326f0a98c679a304bd9f00150"
+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
 dependencies = [
- "version_check 0.1.5",
+ "version_check",
 ]
 
 [[package]]
@@ -5334,12 +5334,6 @@ dependencies = [
  "failure",
 ]
 
-[[package]]
-name = "version_check"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
-
 [[package]]
 name = "version_check"
 version = "0.9.1"

src/librustc/traits/fulfill.rs

@@ -18,10 +18,13 @@ use super::{FulfillmentError, FulfillmentErrorCode};
 use super::{ObligationCause, PredicateObligation};
 
 impl<'tcx> ForestObligation for PendingPredicateObligation<'tcx> {
-    type Predicate = ty::Predicate<'tcx>;
+    /// Note that we include both the `ParamEnv` and the `Predicate`,
+    /// as the `ParamEnv` can influence whether fulfillment succeeds
+    /// or fails.
+    type CacheKey = ty::ParamEnvAnd<'tcx, ty::Predicate<'tcx>>;
 
-    fn as_predicate(&self) -> &Self::Predicate {
-        &self.obligation.predicate
+    fn as_cache_key(&self) -> Self::CacheKey {
+        self.obligation.param_env.and(self.obligation.predicate)
     }
 }
 

src/librustc_ast_lowering/pat.rs

@@ -128,6 +128,13 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let mut slice = None;
         let mut prev_rest_span = None;
 
+        // Lowers `$bm $ident @ ..` to `$bm $ident @ _`.
+        let lower_rest_sub = |this: &mut Self, pat, bm, ident, sub| {
+            let lower_sub = |this: &mut Self| Some(this.pat_wild_with_node_id_of(sub));
+            let node = this.lower_pat_ident(pat, bm, ident, lower_sub);
+            this.pat_with_node_id_of(pat, node)
+        };
+
         let mut iter = pats.iter();
         // Lower all the patterns until the first occurrence of a sub-slice pattern.
         for pat in iter.by_ref() {
@@ -142,9 +149,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 // Record, lower it to `$binding_mode $ident @ _`, and stop here.
                 PatKind::Ident(ref bm, ident, Some(ref sub)) if sub.is_rest() => {
                     prev_rest_span = Some(sub.span);
-                    let lower_sub = |this: &mut Self| Some(this.pat_wild_with_node_id_of(sub));
-                    let node = self.lower_pat_ident(pat, bm, ident, lower_sub);
-                    slice = Some(self.pat_with_node_id_of(pat, node));
+                    slice = Some(lower_rest_sub(self, pat, bm, ident, sub));
                     break;
                 }
                 // It was not a subslice pattern so lower it normally.
@@ -157,9 +162,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             // There was a previous subslice pattern; make sure we don't allow more.
             let rest_span = match pat.kind {
                 PatKind::Rest => Some(pat.span),
-                PatKind::Ident(.., Some(ref sub)) if sub.is_rest() => {
-                    // The `HirValidator` is merciless; add a `_` pattern to avoid ICEs.
-                    after.push(self.pat_wild_with_node_id_of(pat));
+                PatKind::Ident(ref bm, ident, Some(ref sub)) if sub.is_rest() => {
+                    // #69103: Lower into `binding @ _` as above to avoid ICEs.
+                    after.push(lower_rest_sub(self, pat, bm, ident, sub));
                     Some(sub.span)
                 }
                 _ => None,

src/librustc_data_structures/obligation_forest/graphviz.rs

@@ -52,7 +52,7 @@ impl<'a, O: ForestObligation + 'a> dot::Labeller<'a> for &'a ObligationForest<O>
 
     fn node_label(&self, index: &Self::Node) -> dot::LabelText<'_> {
         let node = &self.nodes[*index];
-        let label = format!("{:?} ({:?})", node.obligation.as_predicate(), node.state.get());
+        let label = format!("{:?} ({:?})", node.obligation.as_cache_key(), node.state.get());
 
         dot::LabelText::LabelStr(label.into())
     }

src/librustc_data_structures/obligation_forest/mod.rs

@@ -86,9 +86,13 @@ mod graphviz;
 mod tests;
 
 pub trait ForestObligation: Clone + Debug {
-    type Predicate: Clone + hash::Hash + Eq + Debug;
+    type CacheKey: Clone + hash::Hash + Eq + Debug;
 
-    fn as_predicate(&self) -> &Self::Predicate;
+    /// Converts this `ForestObligation` suitable for use as a cache key.
+    /// If two distinct `ForestObligations`s return the same cache key,
+    /// then it must be sound to use the result of processing one obligation
+    /// (e.g. success for error) for the other obligation
+    fn as_cache_key(&self) -> Self::CacheKey;
 }
 
 pub trait ObligationProcessor {
@@ -138,12 +142,12 @@ pub struct ObligationForest<O: ForestObligation> {
     nodes: Vec<Node<O>>,
 
     /// A cache of predicates that have been successfully completed.
-    done_cache: FxHashSet<O::Predicate>,
+    done_cache: FxHashSet<O::CacheKey>,
 
     /// A cache of the nodes in `nodes`, indexed by predicate. Unfortunately,
     /// its contents are not guaranteed to match those of `nodes`. See the
     /// comments in `process_obligation` for details.
-    active_cache: FxHashMap<O::Predicate, usize>,
+    active_cache: FxHashMap<O::CacheKey, usize>,
 
     /// A vector reused in compress(), to avoid allocating new vectors.
     node_rewrites: Vec<usize>,
@@ -157,7 +161,7 @@ pub struct ObligationForest<O: ForestObligation> {
     /// See [this][details] for details.
     ///
     /// [details]: https://github.com/rust-lang/rust/pull/53255#issuecomment-421184780
-    error_cache: FxHashMap<ObligationTreeId, FxHashSet<O::Predicate>>,
+    error_cache: FxHashMap<ObligationTreeId, FxHashSet<O::CacheKey>>,
 }
 
 #[derive(Debug)]
@@ -305,11 +309,12 @@ impl<O: ForestObligation> ObligationForest<O> {
 
     // Returns Err(()) if we already know this obligation failed.
     fn register_obligation_at(&mut self, obligation: O, parent: Option<usize>) -> Result<(), ()> {
-        if self.done_cache.contains(obligation.as_predicate()) {
+        if self.done_cache.contains(&obligation.as_cache_key()) {
+            debug!("register_obligation_at: ignoring already done obligation: {:?}", obligation);
             return Ok(());
         }
 
-        match self.active_cache.entry(obligation.as_predicate().clone()) {
+        match self.active_cache.entry(obligation.as_cache_key().clone()) {
             Entry::Occupied(o) => {
                 let node = &mut self.nodes[*o.get()];
                 if let Some(parent_index) = parent {
@@ -333,7 +338,7 @@ impl<O: ForestObligation> ObligationForest<O> {
                     && self
                         .error_cache
                         .get(&obligation_tree_id)
-                        .map(|errors| errors.contains(obligation.as_predicate()))
+                        .map(|errors| errors.contains(&obligation.as_cache_key()))
                         .unwrap_or(false);
 
                 if already_failed {
@@ -380,7 +385,7 @@ impl<O: ForestObligation> ObligationForest<O> {
         self.error_cache
             .entry(node.obligation_tree_id)
             .or_default()
-            .insert(node.obligation.as_predicate().clone());
+            .insert(node.obligation.as_cache_key().clone());
     }
 
     /// Performs a pass through the obligation list. This must
@@ -618,11 +623,11 @@ impl<O: ForestObligation> ObligationForest<O> {
                     // `self.nodes`. See the comment in `process_obligation`
                     // for more details.
                     if let Some((predicate, _)) =
-                        self.active_cache.remove_entry(node.obligation.as_predicate())
+                        self.active_cache.remove_entry(&node.obligation.as_cache_key())
                     {
                         self.done_cache.insert(predicate);
                     } else {
-                        self.done_cache.insert(node.obligation.as_predicate().clone());
+                        self.done_cache.insert(node.obligation.as_cache_key().clone());
                     }
                     if do_completed == DoCompleted::Yes {
                         // Extract the success stories.
@@ -635,7 +640,7 @@ impl<O: ForestObligation> ObligationForest<O> {
                     // We *intentionally* remove the node from the cache at this point. Otherwise
                     // tests must come up with a different type on every type error they
                     // check against.
-                    self.active_cache.remove(node.obligation.as_predicate());
+                    self.active_cache.remove(&node.obligation.as_cache_key());
                     self.insert_into_error_cache(index);
                     node_rewrites[index] = orig_nodes_len;
                     dead_nodes += 1;

src/librustc_data_structures/obligation_forest/tests.rs

@@ -4,9 +4,9 @@ use std::fmt;
 use std::marker::PhantomData;
 
 impl<'a> super::ForestObligation for &'a str {
-    type Predicate = &'a str;
+    type CacheKey = &'a str;
 
-    fn as_predicate(&self) -> &Self::Predicate {
+    fn as_cache_key(&self) -> Self::CacheKey {
         self
     }
 }

src/librustc_expand/mbe/macro_rules.rs

@@ -191,9 +191,9 @@ fn generic_extension<'cx>(
     let mut best_failure: Option<(Token, &str)> = None;
 
     // We create a base parser that can be used for the "black box" parts.
-    // Every iteration needs a fresh copy of that base parser. However, the
-    // parser is not mutated on many of the iterations, particularly when
-    // dealing with macros like this:
+    // Every iteration needs a fresh copy of that parser. However, the parser
+    // is not mutated on many of the iterations, particularly when dealing with
+    // macros like this:
     //
     // macro_rules! foo {
     //     ("a") => (A);
@@ -209,11 +209,9 @@ fn generic_extension<'cx>(
     // hacky, but speeds up the `html5ever` benchmark significantly. (Issue
     // 68836 suggests a more comprehensive but more complex change to deal with
     // this situation.)
-    let base_parser = base_parser_from_cx(&cx.current_expansion, &cx.parse_sess, arg.clone());
+    let parser = parser_from_cx(&cx.current_expansion, &cx.parse_sess, arg.clone());
 
     for (i, lhs) in lhses.iter().enumerate() {
-        let mut parser = Cow::Borrowed(&base_parser);
-
         // try each arm's matchers
         let lhs_tt = match *lhs {
             mbe::TokenTree::Delimited(_, ref delim) => &delim.tts[..],
@@ -224,13 +222,14 @@ fn generic_extension<'cx>(
         // This is used so that if a matcher is not `Success(..)`ful,
         // then the spans which became gated when parsing the unsuccessful matcher
         // are not recorded. On the first `Success(..)`ful matcher, the spans are merged.
-        let mut gated_spans_snaphot = mem::take(&mut *cx.parse_sess.gated_spans.spans.borrow_mut());
+        let mut gated_spans_snapshot =
+            mem::take(&mut *cx.parse_sess.gated_spans.spans.borrow_mut());
 
-        match parse_tt(&mut parser, lhs_tt) {
+        match parse_tt(&mut Cow::Borrowed(&parser), lhs_tt) {
             Success(named_matches) => {
                 // The matcher was `Success(..)`ful.
                 // Merge the gated spans from parsing the matcher with the pre-existing ones.
-                cx.parse_sess.gated_spans.merge(gated_spans_snaphot);
+                cx.parse_sess.gated_spans.merge(gated_spans_snapshot);
 
                 let rhs = match rhses[i] {
                     // ignore delimiters
@@ -291,9 +290,9 @@ fn generic_extension<'cx>(
 
         // The matcher was not `Success(..)`ful.
         // Restore to the state before snapshotting and maybe try again.
-        mem::swap(&mut gated_spans_snaphot, &mut cx.parse_sess.gated_spans.spans.borrow_mut());
+        mem::swap(&mut gated_spans_snapshot, &mut cx.parse_sess.gated_spans.spans.borrow_mut());
     }
-    drop(base_parser);
+    drop(parser);
 
     let (token, label) = best_failure.expect("ran no matchers");
     let span = token.span.substitute_dummy(sp);
@@ -311,9 +310,8 @@ fn generic_extension<'cx>(
                 mbe::TokenTree::Delimited(_, ref delim) => &delim.tts[..],
                 _ => continue,
             };
-            let base_parser =
-                base_parser_from_cx(&cx.current_expansion, &cx.parse_sess, arg.clone());
-            match parse_tt(&mut Cow::Borrowed(&base_parser), lhs_tt) {
+            let parser = parser_from_cx(&cx.current_expansion, &cx.parse_sess, arg.clone());
+            match parse_tt(&mut Cow::Borrowed(&parser), lhs_tt) {
                 Success(_) => {
                     if comma_span.is_dummy() {
                         err.note("you might be missing a comma");
@@ -395,8 +393,8 @@ pub fn compile_declarative_macro(
         ),
     ];
 
-    let base_parser = Parser::new(sess, body, None, true, true, rustc_parse::MACRO_ARGUMENTS);
-    let argument_map = match parse_tt(&mut Cow::Borrowed(&base_parser), &argument_gram) {
+    let parser = Parser::new(sess, body, None, true, true, rustc_parse::MACRO_ARGUMENTS);
+    let argument_map = match parse_tt(&mut Cow::Borrowed(&parser), &argument_gram) {
         Success(m) => m,
         Failure(token, msg) => {
             let s = parse_failure_msg(&token);
@@ -1212,7 +1210,7 @@ fn quoted_tt_to_string(tt: &mbe::TokenTree) -> String {
     }
 }
 
-fn base_parser_from_cx<'cx>(
+fn parser_from_cx<'cx>(
     current_expansion: &'cx ExpansionData,
     sess: &'cx ParseSess,
     tts: TokenStream,

src/librustc_mir/transform/simplify_try.rs

@@ -52,6 +52,8 @@ impl<'tcx> MirPass<'tcx> for SimplifyArmIdentity {
                 Some(x) => x,
             };
             if local_tmp_s0 != local_tmp_s1
+                // Avoid moving into ourselves.
+                || local_0 == local_1
                 // The field-and-variant information match up.
                 || vf_s0 != vf_s1
                 // Source and target locals have the same type.
@@ -64,6 +66,7 @@ impl<'tcx> MirPass<'tcx> for SimplifyArmIdentity {
             }
 
             // Right shape; transform!
+            s0.source_info = s2.source_info;
             match &mut s0.kind {
                 StatementKind::Assign(box (place, rvalue)) => {
                     *place = local_0.into();