Auto merge of #59606 - Centril:rollup, r=Centril

Rollup of 7 pull requests

Successful merges:

 - #58507 (Add a -Z time option which prints only passes which runs once)
 - #58919 (Suggest using anonymous lifetime in `impl Trait` return)
 - #59041 (fixes #56766)
 - #59586 (Fixed URL in cargotest::TEST_REPOS)
 - #59595 (Update rustc-guide submodule)
 - #59601 (Fix small typo)
 - #59603 (stabilize ptr::hash)

Failed merges:

r? @ghost

Author: bors

src/doc/rustc-guide

@@ -2561,7 +2561,6 @@ pub fn eq<T: ?Sized>(a: *const T, b: *const T) -> bool {
 /// # Examples
 ///
 /// ```
-/// #![feature(ptr_hash)]
 /// use std::collections::hash_map::DefaultHasher;
 /// use std::hash::{Hash, Hasher};
 /// use std::ptr;
@@ -2579,7 +2578,7 @@ pub fn eq<T: ?Sized>(a: *const T, b: *const T) -> bool {
 ///
 /// assert_eq!(actual, expected);
 /// ```
-#[unstable(feature = "ptr_hash", reason = "newly added", issue = "56286")]
+#[stable(feature = "ptr_hash", since = "1.35.0")]
 pub fn hash<T: ?Sized, S: hash::Hasher>(hashee: *const T, into: &mut S) {
     use hash::Hash;
     hashee.hash(into);

src/libcore/ptr.rs

@@ -1,6 +1,7 @@
 //! Error Reporting for Anonymous Region Lifetime Errors
 //! where one region is named and the other is anonymous.
 use crate::infer::error_reporting::nice_region_error::NiceRegionError;
+use crate::hir::{FunctionRetTy, TyKind};
 use crate::ty;
 use errors::{Applicability, DiagnosticBuilder};
 
@@ -11,9 +12,10 @@ impl<'a, 'gcx, 'tcx> NiceRegionError<'a, 'gcx, 'tcx> {
         let (span, sub, sup) = self.get_regions();
 
         debug!(
-            "try_report_named_anon_conflict(sub={:?}, sup={:?})",
+            "try_report_named_anon_conflict(sub={:?}, sup={:?}, error={:?})",
             sub,
-            sup
+            sup,
+            self.error,
         );
 
         // Determine whether the sub and sup consist of one named region ('a)
@@ -84,6 +86,13 @@ impl<'a, 'gcx, 'tcx> NiceRegionError<'a, 'gcx, 'tcx> {
             {
                 return None;
             }
+            if let FunctionRetTy::Return(ty) = &fndecl.output {
+                if let (TyKind::Def(_, _), ty::ReStatic) = (&ty.node, sub) {
+                    // This is an impl Trait return that evaluates de need of 'static.
+                    // We handle this case better in `static_impl_trait`.
+                    return None;
+                }
+            }
         }
 
         let (error_var, span_label_var) = if let Some(simple_ident) = arg.pat.simple_ident() {
@@ -103,13 +112,13 @@ impl<'a, 'gcx, 'tcx> NiceRegionError<'a, 'gcx, 'tcx> {
             error_var
         );
 
+        diag.span_label(span, format!("lifetime `{}` required", named));
         diag.span_suggestion(
-                new_ty_span,
-                &format!("add explicit lifetime `{}` to {}", named, span_label_var),
-                new_ty.to_string(),
-                Applicability::Unspecified,
-            )
-            .span_label(span, format!("lifetime `{}` required", named));
+            new_ty_span,
+            &format!("add explicit lifetime `{}` to {}", named, span_label_var),
+            new_ty.to_string(),
+            Applicability::Unspecified,
+        );
 
         Some(diag)
     }

src/librustc/infer/error_reporting/nice_region_error/named_anon_conflict.rs

@@ -1200,6 +1200,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "when using two-phase-borrows, allow two phases even for non-autoref `&mut` borrows"),
     time_passes: bool = (false, parse_bool, [UNTRACKED],
         "measure time of each rustc pass"),
+    time: bool = (false, parse_bool, [UNTRACKED],
+        "measure time of rustc processes"),
     count_llvm_insns: bool = (false, parse_bool,
         [UNTRACKED_WITH_WARNING(true,
         "The output generated by `-Z count_llvm_insns` might not be reliable \

src/librustc/session/config.rs

@@ -504,6 +504,9 @@ impl Session {
         self.opts.debugging_opts.verbose
     }
     pub fn time_passes(&self) -> bool {
+        self.opts.debugging_opts.time_passes || self.opts.debugging_opts.time
+    }
+    pub fn time_extended(&self) -> bool {
         self.opts.debugging_opts.time_passes
     }
     pub fn profile_queries(&self) -> bool {

src/librustc/session/mod.rs

@@ -12,7 +12,7 @@ use crate::session::{CrateDisambiguator, Session};
 use crate::ty;
 use crate::ty::codec::{self as ty_codec, TyDecoder, TyEncoder};
 use crate::ty::context::TyCtxt;
-use crate::util::common::time;
+use crate::util::common::{time, time_ext};
 
 use errors::Diagnostic;
 use rustc_data_structures::fx::FxHashMap;
@@ -1080,23 +1080,22 @@ fn encode_query_results<'enc, 'a, 'tcx, Q, E>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     let desc = &format!("encode_query_results for {}",
         unsafe { ::std::intrinsics::type_name::<Q>() });
 
-    time(tcx.sess, desc, || {
+    time_ext(tcx.sess.time_extended(), Some(tcx.sess), desc, || {
+        let map = Q::query_cache(tcx).borrow();
+        assert!(map.active.is_empty());
+        for (key, entry) in map.results.iter() {
+            if Q::cache_on_disk(tcx, key.clone()) {
+                let dep_node = SerializedDepNodeIndex::new(entry.index.index());
 
-    let map = Q::query_cache(tcx).borrow();
-    assert!(map.active.is_empty());
-    for (key, entry) in map.results.iter() {
-        if Q::cache_on_disk(tcx, key.clone()) {
-            let dep_node = SerializedDepNodeIndex::new(entry.index.index());
+                // Record position of the cache entry
+                query_result_index.push((dep_node, AbsoluteBytePos::new(encoder.position())));
 
-            // Record position of the cache entry
-            query_result_index.push((dep_node, AbsoluteBytePos::new(encoder.position())));
-
-            // Encode the type check tables with the SerializedDepNodeIndex
-            // as tag.
-            encoder.encode_tagged(dep_node, &entry.value)?;
+                // Encode the type check tables with the SerializedDepNodeIndex
+                // as tag.
+                encoder.encode_tagged(dep_node, &entry.value)?;
+            }
         }
-    }
 
-    Ok(())
+        Ok(())
     })
 }

src/librustc/ty/query/on_disk_cache.rs

@@ -18,7 +18,7 @@ use rustc::session::Session;
 use rustc::middle::cstore::{NativeLibrary, NativeLibraryKind};
 use rustc::middle::dependency_format::Linkage;
 use rustc_codegen_ssa::CodegenResults;
-use rustc::util::common::time;
+use rustc::util::common::{time, time_ext};
 use rustc_fs_util::fix_windows_verbatim_for_gcc;
 use rustc::hir::def_id::CrateNum;
 use tempfile::{Builder as TempFileBuilder, TempDir};
@@ -1319,7 +1319,7 @@ fn add_upstream_rust_crates(cmd: &mut dyn Linker,
         let name = cratepath.file_name().unwrap().to_str().unwrap();
         let name = &name[3..name.len() - 5]; // chop off lib/.rlib
 
-        time(sess, &format!("altering {}.rlib", name), || {
+        time_ext(sess.time_extended(), Some(sess), &format!("altering {}.rlib", name), || {
             let cfg = archive_config(sess, &dst, Some(cratepath));
             let mut archive = ArchiveBuilder::new(cfg);
             archive.update_symbols();

src/librustc_codegen_llvm/back/link.rs

@@ -125,7 +125,7 @@ impl ModuleConfig {
         self.verify_llvm_ir = sess.verify_llvm_ir();
         self.no_prepopulate_passes = sess.opts.cg.no_prepopulate_passes;
         self.no_builtins = no_builtins || sess.target.target.options.no_builtins;
-        self.time_passes = sess.time_passes();
+        self.time_passes = sess.time_extended();
         self.inline_threshold = sess.opts.cg.inline_threshold;
         self.obj_is_bitcode = sess.target.target.options.obj_is_bitcode ||
                               sess.opts.cg.linker_plugin_lto.enabled();
@@ -1091,7 +1091,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         fewer_names: sess.fewer_names(),
         save_temps: sess.opts.cg.save_temps,
         opts: Arc::new(sess.opts.clone()),
-        time_passes: sess.time_passes(),
+        time_passes: sess.time_extended(),
         profiler: sess.self_profiling.clone(),
         exported_symbols,
         plugin_passes: sess.plugin_llvm_passes.borrow().clone(),

src/librustc_codegen_ssa/back/write.rs

@@ -132,6 +132,15 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             }
         });
         if let Some(i) = best_choice {
+            if let Some(next) = categorized_path.get(i + 1) {
+                if categorized_path[i].0 == ConstraintCategory::Return
+                    && next.0 == ConstraintCategory::OpaqueType
+                {
+                    // The return expression is being influenced by the return type being
+                    // impl Trait, point at the return type and not the return expr.
+                    return *next;
+                }
+            }
             return categorized_path[i];
         }
 
@@ -240,6 +249,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             self.provides_universal_region(r, fr, outlived_fr)
         });
 
+        debug!("report_error: category={:?} {:?}", category, span);
         // Check if we can use one of the "nice region errors".
         if let (Some(f), Some(o)) = (self.to_error_region(fr), self.to_error_region(outlived_fr)) {
             let tables = infcx.tcx.typeck_tables_of(mir_def_id);

src/librustc_mir/borrow_check/nll/region_infer/error_reporting/mod.rs

@@ -403,8 +403,9 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         mir_def_id: DefId,
         errors_buffer: &mut Vec<Diagnostic>,
     ) -> Option<ClosureRegionRequirements<'gcx>> {
-        common::time(
-            infcx.tcx.sess,
+        common::time_ext(
+            infcx.tcx.sess.time_extended(),
+            Some(infcx.tcx.sess),
             &format!("solve_nll_region_constraints({:?})", mir_def_id),
             || self.solve_inner(infcx, mir, mir_def_id, errors_buffer),
         )

src/librustc_mir/borrow_check/nll/region_infer/mod.rs

@@ -431,7 +431,7 @@ impl<'a, 'mir, 'tcx> Eq for EvalSnapshot<'a, 'mir, 'tcx>
 impl<'a, 'mir, 'tcx> PartialEq for EvalSnapshot<'a, 'mir, 'tcx>
 {
     fn eq(&self, other: &Self) -> bool {
-        // FIXME: This looks to be a *ridicolously expensive* comparison operation.
+        // FIXME: This looks to be a *ridiculously expensive* comparison operation.
         // Doesn't this make tons of copies?  Either `snapshot` is very badly named,
         // or it does!
         self.snapshot() == other.snapshot()

src/librustc_mir/interpret/snapshot.rs

@@ -6722,6 +6722,22 @@ impl<'a> Parser<'a> {
             self.expect(&token::OpenDelim(token::Brace))?;
             let mut trait_items = vec![];
             while !self.eat(&token::CloseDelim(token::Brace)) {
+                if let token::DocComment(_) = self.token {
+                    if self.look_ahead(1,
+                    |tok| tok == &token::Token::CloseDelim(token::Brace)) {
+                        let mut err = self.diagnostic().struct_span_err_with_code(
+                            self.span,
+                            "found a documentation comment that doesn't document anything",
+                            DiagnosticId::Error("E0584".into()),
+                        );
+                        err.help("doc comments must come before what they document, maybe a \
+                            comment was intended with `//`?",
+                        );
+                        err.emit();
+                        self.bump();
+                        continue;
+                    }
+                }
                 let mut at_end = false;
                 match self.parse_trait_item(&mut at_end) {
                     Ok(item) => trait_items.push(item),

src/libsyntax/parse/parser.rs

@@ -1,7 +1,7 @@
 use std::fmt::Debug;
 
 fn elided(x: &i32) -> impl Copy { x }
-//~^ ERROR explicit lifetime required in the type of `x` [E0621]
+//~^ ERROR cannot infer an appropriate lifetime
 
 fn explicit<'a>(x: &'a i32) -> impl Copy { x }
 //~^ ERROR cannot infer an appropriate lifetime

src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs

@@ -1,10 +1,20 @@
-error[E0621]: explicit lifetime required in the type of `x`
-  --> $DIR/must_outlive_least_region_or_bound.rs:3:23
+error: cannot infer an appropriate lifetime
+  --> $DIR/must_outlive_least_region_or_bound.rs:3:35
    |
 LL | fn elided(x: &i32) -> impl Copy { x }
-   |              ----     ^^^^^^^^^ lifetime `'static` required
-   |              |
-   |              help: add explicit lifetime `'static` to the type of `x`: `&'static i32`
+   |                       ---------   ^ ...but this borrow...
+   |                       |
+   |                       this return type evaluates to the `'static` lifetime...
+   |
+note: ...can't outlive the anonymous lifetime #1 defined on the function body at 3:1
+  --> $DIR/must_outlive_least_region_or_bound.rs:3:1
+   |
+LL | fn elided(x: &i32) -> impl Copy { x }
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: you can add a constraint to the return type to make it last less than `'static` and match the anonymous lifetime #1 defined on the function body at 3:1
+   |
+LL | fn elided(x: &i32) -> impl Copy + '_ { x }
+   |                       ^^^^^^^^^^^^^^
 
 error: cannot infer an appropriate lifetime
   --> $DIR/must_outlive_least_region_or_bound.rs:6:44
@@ -67,5 +77,5 @@ LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
 
 error: aborting due to 5 previous errors
 
-Some errors occurred: E0310, E0621, E0623.
+Some errors occurred: E0310, E0623.
 For more information about an error, try `rustc --explain E0310`.

src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr

@@ -8,8 +8,8 @@ trait Foo<'a> {
 impl<'a, T> Foo<'a> for T { }
 
 fn foo<'a, T>(x: &T) -> impl Foo<'a> {
+//~^ ERROR explicit lifetime required in the type of `x` [E0621]
     x
-        //~^ ERROR explicit lifetime required in the type of `x` [E0621]
 }
 
 fn main() {}

src/test/ui/nll/ty-outlives/impl-trait-captures.rs

@@ -1,8 +1,8 @@
 error[E0621]: explicit lifetime required in the type of `x`
-  --> $DIR/impl-trait-captures.rs:11:5
+  --> $DIR/impl-trait-captures.rs:10:25
    |
-LL |     x
-   |     ^ lifetime `ReEarlyBound(0, 'a)` required
+LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> {
+   |                         ^^^^^^^^^^^^ lifetime `ReEarlyBound(0, 'a)` required
 help: add explicit lifetime `ReEarlyBound(0, 'a)` to the type of `x`
    |
 LL | fn foo<'a, T>(x: &ReEarlyBound(0, 'a) T) -> impl Foo<'a> {

src/test/ui/nll/ty-outlives/impl-trait-captures.stderr

@@ -0,0 +1,6 @@
+trait User{
+    fn test();
+    /// empty doc
+    //~^ ERROR found a documentation comment that doesn't document anything
+}
+fn main() {}

src/test/ui/parser/doc-inside-trait-item.rs

@@ -0,0 +1,11 @@
+error[E0584]: found a documentation comment that doesn't document anything
+  --> $DIR/doc-inside-trait-item.rs:3:5
+   |
+LL |     /// empty doc
+   |     ^^^^^^^^^^^^^
+   |
+   = help: doc comments must come before what they document, maybe a comment was intended with `//`?
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0584`.

src/test/ui/parser/doc-inside-trait-item.stderr

@@ -30,7 +30,7 @@ const TEST_REPOS: &'static [Test] = &[
     },
     Test {
         name: "tokei",
-        repo: "https://github.com/Aaronepower/tokei",
+        repo: "https://github.com/XAMPPRocky/tokei",
         sha: "5e11c4852fe4aa086b0e4fe5885822fbe57ba928",
         lock: None,
         packages: &[],