Auto merge of #55746 - kennytm:rollup, r=kennytm

Rollup of 14 pull requests

Successful merges:

 - #55377 (Slight copy-editing for `std::cell::Cell` docs)
 - #55441 (Remove unused re import in gdb_rust_pretty_printing)
 - #55453 (Choose predicates without inference variables over those with them)
 - #55495 (Don't print opt fuel messages to stdout because it breaks Rustbuild)
 - #55501 (Make `process_obligations`' computation of `completed` optional.)
 - #55510 (Fix feature gate only being checked on first repr attr.)
 - #55609 (Run name-anon-globals after LTO passes as well)
 - #55645 (do not print wrapping ranges like normal ranges in validity diagnostics)
 - #55688 (Standardised names and location of ui issue tests)
 - #55692 (-C remark: fix incorrect warning about requiring "--debuginfo" instead of "-C debuginfo=n")
 - #55702 (Add `aarch64-pc-windows-msvc` to deployed targets)
 - #55728 (Update lldb)
 - #55730 (Use trait impl method span when type param mismatch is due to impl Trait)
 - #55734 (refactor: use shorthand fields)

Author: bors

src/etc/gdb_rust_pretty_printing.py

@@ -9,7 +9,6 @@
 # except according to those terms.
 
 import gdb
-import re
 import sys
 import debugger_pretty_printers_common as rustpp
 

src/liballoc/string.rs

@@ -502,7 +502,7 @@ impl String {
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn from_utf8(vec: Vec<u8>) -> Result<String, FromUtf8Error> {
         match str::from_utf8(&vec) {
-            Ok(..) => Ok(String { vec: vec }),
+            Ok(..) => Ok(String { vec }),
             Err(e) => {
                 Err(FromUtf8Error {
                     bytes: vec,

src/libcore/cell.rs

@@ -207,8 +207,8 @@ use ptr;
 ///
 /// # Examples
 ///
-/// Here you can see how using `Cell<T>` allows to use mutable field inside
-/// immutable struct (which is also called 'interior mutability').
+/// In this example, you can see that `Cell<T>` enables mutation inside an
+/// immutable struct. In other words, it enables "interior mutability".
 ///
 /// ```
 /// use std::cell::Cell;
@@ -225,10 +225,11 @@ use ptr;
 ///
 /// let new_value = 100;
 ///
-/// // ERROR, because my_struct is immutable
+/// // ERROR: `my_struct` is immutable
 /// // my_struct.regular_field = new_value;
 ///
-/// // WORKS, although `my_struct` is immutable, field `special_field` is mutable because it is Cell
+/// // WORKS: although `my_struct` is immutable, `special_field` is a `Cell`,
+/// // which can always be mutated
 /// my_struct.special_field.set(new_value);
 /// assert_eq!(my_struct.special_field.get(), new_value);
 /// ```

src/libpanic_unwind/dwarf/mod.rs

@@ -29,7 +29,7 @@ struct Unaligned<T>(T);
 
 impl DwarfReader {
     pub fn new(ptr: *const u8) -> DwarfReader {
-        DwarfReader { ptr: ptr }
+        DwarfReader { ptr }
     }
 
     // DWARF streams are packed, so e.g. a u32 would not necessarily be aligned

src/libpanic_unwind/seh64_gnu.rs

@@ -41,7 +41,7 @@ struct PanicData {
 }
 
 pub unsafe fn panic(data: Box<dyn Any + Send>) -> u32 {
-    let panic_ctx = Box::new(PanicData { data: data });
+    let panic_ctx = Box::new(PanicData { data });
     let params = [Box::into_raw(panic_ctx) as c::ULONG_PTR];
     c::RaiseException(RUST_PANIC,
                       c::EXCEPTION_NONCONTINUABLE,

src/librustc/infer/resolve.rs

@@ -26,7 +26,7 @@ pub struct OpportunisticTypeResolver<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
 
 impl<'a, 'gcx, 'tcx> OpportunisticTypeResolver<'a, 'gcx, 'tcx> {
     pub fn new(infcx: &'a InferCtxt<'a, 'gcx, 'tcx>) -> Self {
-        OpportunisticTypeResolver { infcx: infcx }
+        OpportunisticTypeResolver { infcx }
     }
 }
 
@@ -54,7 +54,7 @@ pub struct OpportunisticTypeAndRegionResolver<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
 
 impl<'a, 'gcx, 'tcx> OpportunisticTypeAndRegionResolver<'a, 'gcx, 'tcx> {
     pub fn new(infcx: &'a InferCtxt<'a, 'gcx, 'tcx>) -> Self {
-        OpportunisticTypeAndRegionResolver { infcx: infcx }
+        OpportunisticTypeAndRegionResolver { infcx }
     }
 }
 

src/librustc/infer/type_variable.rs

@@ -169,7 +169,7 @@ impl<'tcx> TypeVariableTable<'tcx> {
         // Hack: we only need this so that `types_escaping_snapshot`
         // can see what has been unified; see the Delegate impl for
         // more details.
-        self.values.record(Instantiate { vid: vid });
+        self.values.record(Instantiate { vid });
     }
 
     /// Creates a new type variable.

src/librustc/infer/unify_key.rs

@@ -43,7 +43,7 @@ impl UnifyValue for RegionVidKey {
             value2.min_vid
         };
 
-        Ok(RegionVidKey { min_vid: min_vid })
+        Ok(RegionVidKey { min_vid })
     }
 }
 

src/librustc/middle/stability.rs

@@ -469,7 +469,7 @@ impl<'a, 'tcx> Index<'tcx> {
 /// Cross-references the feature names of unstable APIs with enabled
 /// features and possibly prints errors.
 pub fn check_unstable_api_usage<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
-    let mut checker = Checker { tcx: tcx };
+    let mut checker = Checker { tcx };
     tcx.hir.krate().visit_all_item_likes(&mut checker.as_deep_visitor());
 }
 

src/librustc/mir/mod.rs

@@ -2986,7 +2986,7 @@ impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
         use mir::TerminatorKind::*;
 
         let kind = match self.kind {
-            Goto { target } => Goto { target: target },
+            Goto { target } => Goto { target },
             SwitchInt {
                 ref discr,
                 switch_ty,

src/librustc/mir/tcx.rs

@@ -32,7 +32,7 @@ pub enum PlaceTy<'tcx> {
 
 impl<'a, 'gcx, 'tcx> PlaceTy<'tcx> {
     pub fn from_ty(ty: Ty<'tcx>) -> PlaceTy<'tcx> {
-        PlaceTy::Ty { ty: ty }
+        PlaceTy::Ty { ty }
     }
 
     pub fn to_ty(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Ty<'tcx> {

src/librustc/session/config.rs

@@ -2202,8 +2202,7 @@ pub fn build_session_options_and_crate_config(
     if !cg.remark.is_empty() && debuginfo == DebugInfo::None {
         early_warn(
             error_format,
-            "-C remark will not show source locations without \
-             --debuginfo",
+            "-C remark requires \"-C debuginfo=n\" to show source locations",
         );
     }
 

src/librustc/session/mod.rs

@@ -868,7 +868,7 @@ impl Session {
                 let fuel = self.optimization_fuel_limit.get();
                 ret = fuel != 0;
                 if fuel == 0 && !self.out_of_fuel.get() {
-                    println!("optimization-fuel-exhausted: {}", msg());
+                    eprintln!("optimization-fuel-exhausted: {}", msg());
                     self.out_of_fuel.set(true);
                 } else if fuel > 0 {
                     self.optimization_fuel_limit.set(fuel - 1);

src/librustc/traits/auto_trait.rs

@@ -447,27 +447,51 @@ impl<'a, 'tcx> AutoTraitFinder<'a, 'tcx> {
                                     ty::RegionKind::ReLateBound(_, _),
                                 ) => {}
 
-                                (ty::RegionKind::ReLateBound(_, _), _) => {
+                                (ty::RegionKind::ReLateBound(_, _), _) |
+                                (_, ty::RegionKind::ReVar(_)) => {
+                                    // One of these is true:
                                     // The new predicate has a HRTB in a spot where the old
                                     // predicate does not (if they both had a HRTB, the previous
-                                    // match arm would have executed).
+                                    // match arm would have executed). A HRBT is a 'stricter'
+                                    // bound than anything else, so we want to keep the newer
+                                    // predicate (with the HRBT) in place of the old predicate.
                                     //
-                                    // The means we want to remove the older predicate from
-                                    // user_computed_preds, since having both it and the new
+                                    // OR
+                                    //
+                                    // The old predicate has a region variable where the new
+                                    // predicate has some other kind of region. An region
+                                    // variable isn't something we can actually display to a user,
+                                    // so we choose ther new predicate (which doesn't have a region
+                                    // varaible).
+                                    //
+                                    // In both cases, we want to remove the old predicate,
+                                    // from user_computed_preds, and replace it with the new
+                                    // one. Having both the old and the new
                                     // predicate in a ParamEnv would confuse SelectionContext
+                                    //
                                     // We're currently in the predicate passed to 'retain',
                                     // so we return 'false' to remove the old predicate from
                                     // user_computed_preds
                                     return false;
                                 }
-                                (_, ty::RegionKind::ReLateBound(_, _)) => {
-                                    // This is the opposite situation as the previous arm - the
-                                    // old predicate has a HRTB lifetime in a place where the
-                                    // new predicate does not. We want to leave the old
+                                (_, ty::RegionKind::ReLateBound(_, _)) |
+                                (ty::RegionKind::ReVar(_), _) => {
+                                    // This is the opposite situation as the previous arm.
+                                    // One of these is true:
+                                    //
+                                    // The old predicate has a HRTB lifetime in a place where the
+                                    // new predicate does not.
+                                    //
+                                    // OR
+                                    //
+                                    // The new predicate has a region variable where the old
+                                    // predicate has some other type of region.
+                                    //
+                                    // We want to leave the old
                                     // predicate in user_computed_preds, and skip adding
                                     // new_pred to user_computed_params.
                                     should_add_new = false
-                                }
+                                },
                                 _ => {}
                             }
                         }

src/librustc/traits/fulfill.rs

@@ -12,8 +12,9 @@ use infer::InferCtxt;
 use mir::interpret::{GlobalId, ErrorHandled};
 use ty::{self, Ty, TypeFoldable, ToPolyTraitRef, ToPredicate};
 use ty::error::ExpectedFound;
-use rustc_data_structures::obligation_forest::{Error, ForestObligation, ObligationForest};
-use rustc_data_structures::obligation_forest::{ObligationProcessor, ProcessResult};
+use rustc_data_structures::obligation_forest::{DoCompleted, Error, ForestObligation};
+use rustc_data_structures::obligation_forest::{ObligationForest, ObligationProcessor};
+use rustc_data_structures::obligation_forest::{ProcessResult};
 use std::marker::PhantomData;
 use hir::def_id::DefId;
 
@@ -98,7 +99,7 @@ impl<'a, 'gcx, 'tcx> FulfillmentContext<'tcx> {
             let outcome = self.predicates.process_obligations(&mut FulfillProcessor {
                 selcx,
                 register_region_obligations: self.register_region_obligations
-            });
+            }, DoCompleted::No);
             debug!("select: outcome={:#?}", outcome);
 
             // FIXME: if we kept the original cache key, we could mark projection

src/librustc/traits/project.rs

@@ -266,7 +266,7 @@ fn project_and_unify_type<'cx, 'gcx, 'tcx>(
         },
         Err(err) => {
             debug!("project_and_unify_type: equating types encountered error {:?}", err);
-            Err(MismatchedProjectionTypes { err: err })
+            Err(MismatchedProjectionTypes { err })
         }
     }
 }

src/librustc/traits/select.rs

@@ -3526,7 +3526,7 @@ impl<'cx, 'gcx, 'tcx> SelectionContext<'cx, 'gcx, 'tcx> {
             _ => bug!(),
         };
 
-        Ok(VtableBuiltinData { nested: nested })
+        Ok(VtableBuiltinData { nested })
     }
 
     ///////////////////////////////////////////////////////////////////////////

src/librustc/ty/_match.rs

@@ -34,7 +34,7 @@ pub struct Match<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
 
 impl<'a, 'gcx, 'tcx> Match<'a, 'gcx, 'tcx> {
     pub fn new(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Match<'a, 'gcx, 'tcx> {
-        Match { tcx: tcx }
+        Match { tcx }
     }
 }
 

src/librustc/ty/fold.rs

@@ -82,7 +82,7 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
     }
 
     fn has_type_flags(&self, flags: TypeFlags) -> bool {
-        self.visit_with(&mut HasTypeFlagsVisitor { flags: flags })
+        self.visit_with(&mut HasTypeFlagsVisitor { flags })
     }
     fn has_projections(&self) -> bool {
         self.has_type_flags(TypeFlags::HAS_PROJECTION)

src/librustc_codegen_llvm/back/lto.rs

@@ -605,6 +605,13 @@ fn run_pass_manager(cgcx: &CodegenContext,
             }
         });
 
+        // We always generate bitcode through ThinLTOBuffers,
+        // which do not support anonymous globals
+        if config.bitcode_needed() {
+            let pass = llvm::LLVMRustFindAndCreatePass("name-anon-globals\0".as_ptr() as *const _);
+            llvm::LLVMRustAddPass(pm, pass.unwrap());
+        }
+
         if config.verify_llvm_ir {
             let pass = llvm::LLVMRustFindAndCreatePass("verify\0".as_ptr() as *const _);
             llvm::LLVMRustAddPass(pm, pass.unwrap());

src/librustc_codegen_llvm/back/write.rs

@@ -337,6 +337,11 @@ impl ModuleConfig {
         self.merge_functions = sess.opts.optimize == config::OptLevel::Default ||
                                sess.opts.optimize == config::OptLevel::Aggressive;
     }
+
+    pub fn bitcode_needed(&self) -> bool {
+        self.emit_bc || self.obj_is_bitcode
+            || self.emit_bc_compressed || self.embed_bitcode
+    }
 }
 
 /// Assembler name and command used by codegen when no_integrated_as is enabled
@@ -564,8 +569,7 @@ unsafe fn optimize(cgcx: &CodegenContext,
             // Some options cause LLVM bitcode to be emitted, which uses ThinLTOBuffers, so we need
             // to make sure we run LLVM's NameAnonGlobals pass when emitting bitcode; otherwise
             // we'll get errors in LLVM.
-            let using_thin_buffers = config.emit_bc || config.obj_is_bitcode
-                || config.emit_bc_compressed || config.embed_bitcode;
+            let using_thin_buffers = config.bitcode_needed();
             let mut have_name_anon_globals_pass = false;
             if !config.no_prepopulate_passes {
                 llvm::LLVMRustAddAnalysisPasses(tm, fpm, llmod);

src/librustc_codegen_llvm/llvm/mod.rs

@@ -190,7 +190,7 @@ impl ObjectFile {
     pub fn new(llmb: &'static mut MemoryBuffer) -> Option<ObjectFile> {
         unsafe {
             let llof = LLVMCreateObjectFile(llmb)?;
-            Some(ObjectFile { llof: llof })
+            Some(ObjectFile { llof })
         }
     }
 }

src/librustc_codegen_llvm/mir/analyze.rs

@@ -346,7 +346,7 @@ pub fn cleanup_kinds<'a, 'tcx>(mir: &mir::Mir<'tcx>) -> IndexVec<mir::BasicBlock
                        funclet, succ, kind);
                 match kind {
                     CleanupKind::NotCleanup => {
-                        result[succ] = CleanupKind::Internal { funclet: funclet };
+                        result[succ] = CleanupKind::Internal { funclet };
                     }
                     CleanupKind::Funclet => {
                         if funclet != succ {

src/librustc_codegen_utils/symbol_names_test.rs

@@ -32,7 +32,7 @@ pub fn report_symbol_names<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     }
 
     tcx.dep_graph.with_ignore(|| {
-        let mut visitor = SymbolNamesTest { tcx: tcx };
+        let mut visitor = SymbolNamesTest { tcx };
         tcx.hir.krate().visit_all_item_likes(&mut visitor);
     })
 }

src/librustc_data_structures/flock.rs

@@ -214,7 +214,7 @@ cfg_if! {
                     unsafe { libc::close(fd); }
                     Err(err)
                 } else {
-                    Ok(Lock { fd: fd })
+                    Ok(Lock { fd })
                 }
             }
         }