Auto merge of #55710 - kennytm:rollup, r=kennytm

Rollup of 11 pull requests

Successful merges:

 - #55490 (resolve: Fix ICE in macro import error recovery)
 - #55597 (std: Enable usage of `thread_local!` through imports)
 - #55601 (Fix tracking issue numbers for some unstable features)
 - #55621 (Add precision for create_dir function)
 - #55644 (ci: Add Dockerfile for dist-powerpcspe-linux)
 - #55664 (Make "all possible cases" help message uniform with existing help messages)
 - #55689 (miri: binary_op_val -> binary_op_imm)
 - #55694 (Fixes #31076)
 - #55696 (NLL Diagnostic Review 3: Missing errors for borrows of union fields)
 - #55700 (Update ui tests with respect to NLL)
 - #55703 (Update `configure --help` (via configure.py) to reflect decoupling of debug+optimize)

src/bootstrap/configure.py

@@ -40,7 +40,7 @@ def v(*args):
     options.append(Option(*args, value=True))
 
 
-o("debug", "rust.debug", "debug mode; disables optimization unless `--enable-optimize` given")
+o("debug", "rust.debug", "enables debugging environment; does not affect optimization of bootstrapped code (use `--disable-optimize` for that)")
 o("docs", "build.docs", "build standard library documentation")
 o("compiler-docs", "build.compiler-docs", "build compiler documentation")
 o("optimize-tests", "rust.optimize-tests", "build tests with optimizations")

src/ci/docker/disabled/dist-powerpcspe-linux/Dockerfile

@@ -0,0 +1,26 @@
+FROM ubuntu:16.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  g++ \
+  make \
+  file \
+  curl \
+  ca-certificates \
+  python2.7 \
+  git \
+  cmake \
+  sudo \
+  gdb \
+  xz-utils \
+  g++-powerpc-linux-gnuspe \
+  libssl-dev \
+  pkg-config
+
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV HOSTS=powerpc-unknown-linux-gnuspe
+
+ENV RUST_CONFIGURE_ARGS --enable-extended --disable-docs
+ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/librustc/middle/dead.rs

@@ -291,10 +291,8 @@ fn has_allow_dead_code_or_lang_attr(tcx: TyCtxt<'_, '_, '_>,
         return true;
     }
 
-    // (To be) stable attribute for #[lang = "panic_impl"]
-    if attr::contains_name(attrs, "panic_implementation") ||
-        attr::contains_name(attrs, "panic_handler")
-    {
+    // Stable attribute for #[lang = "panic_impl"]
+    if attr::contains_name(attrs, "panic_handler") {
         return true;
     }
 

src/librustc/middle/lang_items.rs

@@ -204,9 +204,7 @@ pub fn extract(attrs: &[ast::Attribute]) -> Option<(Symbol, Span)> {
             if let Some(value) = attribute.value_str() {
                 return Some((value, attribute.span));
             }
-        } else if attribute.check_name("panic_implementation") ||
-            attribute.check_name("panic_handler")
-        {
+        } else if attribute.check_name("panic_handler") {
             return Some((Symbol::intern("panic_impl"), attribute.span))
         } else if attribute.check_name("alloc_error_handler") {
             return Some((Symbol::intern("oom"), attribute.span))

src/librustc/mir/mod.rs

@@ -506,25 +506,25 @@ pub enum BorrowKind {
     /// implicit closure bindings. It is needed when the closure is
     /// borrowing or mutating a mutable referent, e.g.:
     ///
-    ///    let x: &mut isize = ...;
-    ///    let y = || *x += 5;
+    ///     let x: &mut isize = ...;
+    ///     let y = || *x += 5;
     ///
     /// If we were to try to translate this closure into a more explicit
     /// form, we'd encounter an error with the code as written:
     ///
-    ///    struct Env { x: & &mut isize }
-    ///    let x: &mut isize = ...;
-    ///    let y = (&mut Env { &x }, fn_ptr);  // Closure is pair of env and fn
-    ///    fn fn_ptr(env: &mut Env) { **env.x += 5; }
+    ///     struct Env { x: & &mut isize }
+    ///     let x: &mut isize = ...;
+    ///     let y = (&mut Env { &x }, fn_ptr);  // Closure is pair of env and fn
+    ///     fn fn_ptr(env: &mut Env) { **env.x += 5; }
     ///
     /// This is then illegal because you cannot mutate an `&mut` found
     /// in an aliasable location. To solve, you'd have to translate with
     /// an `&mut` borrow:
     ///
-    ///    struct Env { x: & &mut isize }
-    ///    let x: &mut isize = ...;
-    ///    let y = (&mut Env { &mut x }, fn_ptr); // changed from &x to &mut x
-    ///    fn fn_ptr(env: &mut Env) { **env.x += 5; }
+    ///     struct Env { x: & &mut isize }
+    ///     let x: &mut isize = ...;
+    ///     let y = (&mut Env { &mut x }, fn_ptr); // changed from &x to &mut x
+    ///     fn fn_ptr(env: &mut Env) { **env.x += 5; }
     ///
     /// Now the assignment to `**env.x` is legal, but creating a
     /// mutable pointer to `x` is not because `x` is not mutable. We

src/librustc_mir/hair/pattern/check_match.rs

@@ -238,8 +238,8 @@ impl<'a, 'tcx> MatchVisitor<'a, 'tcx> {
                                                         is non-empty",
                                                        pat_ty));
                     span_help!(&mut err, scrut.span,
-                               "Please ensure that all possible cases are being handled; \
-                                possibly adding wildcards or more match arms.");
+                               "ensure that all possible cases are being handled, \
+                                possibly by adding wildcards or more match arms");
                     err.emit();
                 }
                 // If the type *is* uninhabited, it's vacuously exhaustive

src/librustc_mir/interpret/intrinsics.rs

@@ -140,7 +140,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
                     "unchecked_shr" => BinOp::Shr,
                     _ => bug!("Already checked for int ops")
                 };
-                let (val, overflowed) = self.binary_op_val(bin_op, l, r)?;
+                let (val, overflowed) = self.binary_op_imm(bin_op, l, r)?;
                 if overflowed {
                     let layout = self.layout_of(substs.type_at(0))?;
                     let r_val =  r.to_scalar()?.to_bits(layout.size)?;

src/librustc_mir/interpret/operator.rs

@@ -28,7 +28,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
         right: ImmTy<'tcx, M::PointerTag>,
         dest: PlaceTy<'tcx, M::PointerTag>,
     ) -> EvalResult<'tcx> {
-        let (val, overflowed) = self.binary_op_val(op, left, right)?;
+        let (val, overflowed) = self.binary_op_imm(op, left, right)?;
         let val = Immediate::ScalarPair(val.into(), Scalar::from_bool(overflowed).into());
         self.write_immediate(val, dest)
     }
@@ -42,7 +42,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
         right: ImmTy<'tcx, M::PointerTag>,
         dest: PlaceTy<'tcx, M::PointerTag>,
     ) -> EvalResult<'tcx> {
-        let (val, _overflowed) = self.binary_op_val(op, left, right)?;
+        let (val, _overflowed) = self.binary_op_imm(op, left, right)?;
         self.write_scalar(val, dest)
     }
 }
@@ -283,9 +283,9 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
     }
 
     /// Convenience wrapper that's useful when keeping the layout together with the
-    /// value.
+    /// immediate value.
     #[inline]
-    pub fn binary_op_val(
+    pub fn binary_op_imm(
         &self,
         bin_op: mir::BinOp,
         left: ImmTy<'tcx, M::PointerTag>,

src/librustc_mir/monomorphize/partitioning.rs

@@ -511,7 +511,7 @@ fn mono_item_visibility(
         //
         // * First is weak lang items. These are basically mechanisms for
         //   libcore to forward-reference symbols defined later in crates like
-        //   the standard library or `#[panic_implementation]` definitions. The
+        //   the standard library or `#[panic_handler]` definitions. The
         //   definition of these weak lang items needs to be referenceable by
         //   libcore, so we're no longer a candidate for internalization.
         //   Removal of these functions can't be done by LLVM but rather must be

src/librustc_mir/transform/const_prop.rs

@@ -455,7 +455,7 @@ impl<'a, 'mir, 'tcx> ConstPropagator<'a, 'mir, 'tcx> {
                 })?;
                 trace!("const evaluating {:?} for {:?} and {:?}", op, left, right);
                 let (val, overflow) = self.use_ecx(source_info, |this| {
-                    this.ecx.binary_op_val(op, l, r)
+                    this.ecx.binary_op_imm(op, l, r)
                 })?;
                 let val = if let Rvalue::CheckedBinaryOp(..) = *rvalue {
                     Immediate::ScalarPair(

src/librustc_resolve/macros.rs

@@ -449,6 +449,9 @@ impl<'a, 'cl> Resolver<'a, 'cl> {
                     return Err(Determinacy::Determined);
                 }
             }
+            Def::Err => {
+                return Err(Determinacy::Determined);
+            }
             _ => panic!("expected `Def::Macro` or `Def::NonMacroAttr`"),
         }
 

src/librustc_typeck/check/method/mod.rs

@@ -289,8 +289,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         // Trait must have a method named `m_name` and it should not have
         // type parameters or early-bound regions.
         let tcx = self.tcx;
-        let method_item =
-            self.associated_item(trait_def_id, m_name, Namespace::Value).unwrap();
+        let method_item = match self.associated_item(trait_def_id, m_name, Namespace::Value) {
+            Some(method_item) => method_item,
+            None => {
+                tcx.sess.delay_span_bug(span,
+                    "operator trait does not have corresponding operator method");
+                return None;
+            }
+        };
         let def_id = method_item.def_id;
         let generics = tcx.generics_of(def_id);
         assert_eq!(generics.params.len(), 0);

src/librustc_typeck/check/mod.rs

@@ -1167,7 +1167,7 @@ fn check_fn<'a, 'gcx, 'tcx>(inherited: &'a Inherited<'a, 'gcx, 'tcx>,
         }
     }
 
-    // Check that a function marked as `#[panic_implementation]` has signature `fn(&PanicInfo) -> !`
+    // Check that a function marked as `#[panic_handler]` has signature `fn(&PanicInfo) -> !`
     if let Some(panic_impl_did) = fcx.tcx.lang_items().panic_impl() {
         if panic_impl_did == fcx.tcx.hir.local_def_id(fn_id) {
             if let Some(panic_info_did) = fcx.tcx.lang_items().panic_info() {

src/libstd/fs.rs

@@ -1755,12 +1755,19 @@ pub fn canonicalize<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
 ///
 /// [changes]: ../io/index.html#platform-specific-behavior
 ///
+/// **NOTE**: If a parent of the given path doesn't exist, this function will
+/// return an error. To create a directory and all its missing parents at the
+/// same time, use the [`create_dir_all`] function.
+///
 /// # Errors
 ///
 /// This function will return an error in the following situations, but is not
 /// limited to just these cases:
 ///
 /// * User lacks permissions to create directory at `path`.
+/// * A parent of the given path doesn't exist. (To create a directory and all
+///   its missing parents at the same time, use the [`create_dir_all`]
+///   function.)
 /// * `path` already exists.
 ///
 /// # Examples

src/libstd/thread/local.rs

@@ -146,13 +146,13 @@ macro_rules! thread_local {
 
     // process multiple declarations
     ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = $init:expr; $($rest:tt)*) => (
-        __thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
-        thread_local!($($rest)*);
+        $crate::__thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
+        $crate::thread_local!($($rest)*);
     );
 
     // handle a single declaration
     ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = $init:expr) => (
-        __thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
+        $crate::__thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
     );
 }
 
@@ -202,7 +202,7 @@ macro_rules! __thread_local_inner {
     };
     ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty, $init:expr) => {
         $(#[$attr])* $vis const $name: $crate::thread::LocalKey<$t> =
-            __thread_local_inner!(@key $(#[$attr])* $vis $name, $t, $init);
+            $crate::__thread_local_inner!(@key $(#[$attr])* $vis $name, $t, $init);
     }
 }
 

src/libsyntax/feature_gate.rs

@@ -349,7 +349,7 @@ declare_features! (
     (active, abi_thiscall, "1.19.0", None, None),
 
     // Allows a test to fail without failing the whole suite
-    (active, allow_fail, "1.19.0", Some(42219), None),
+    (active, allow_fail, "1.19.0", Some(46488), None),
 
     // Allows unsized tuple coercion.
     (active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
@@ -376,7 +376,7 @@ declare_features! (
     (active, non_exhaustive, "1.22.0", Some(44109), None),
 
     // `crate` as visibility modifier, synonymous to `pub(crate)`
-    (active, crate_visibility_modifier, "1.23.0", Some(45388), None),
+    (active, crate_visibility_modifier, "1.23.0", Some(53120), None),
 
     // extern types
     (active, extern_types, "1.23.0", Some(43467), None),
@@ -391,13 +391,13 @@ declare_features! (
     (active, generic_associated_types, "1.23.0", Some(44265), None),
 
     // `extern` in paths
-    (active, extern_in_paths, "1.23.0", Some(44660), None),
+    (active, extern_in_paths, "1.23.0", Some(55600), None),
 
     // Use `?` as the Kleene "at most one" operator
     (active, macro_at_most_once_rep, "1.25.0", Some(48075), None),
 
     // Infer static outlives requirements; RFC 2093
-    (active, infer_static_outlives_requirements, "1.26.0", Some(44493), None),
+    (active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
 
     // Multiple patterns with `|` in `if let` and `while let`
     (active, if_while_or_patterns, "1.26.0", Some(48215), None),
@@ -448,9 +448,6 @@ declare_features! (
     // Integer match exhaustiveness checking
     (active, exhaustive_integer_patterns, "1.30.0", Some(50907), None),
 
-    // RFC 2070: #[panic_implementation] / #[panic_handler]
-    (active, panic_implementation, "1.28.0", Some(44489), None),
-
     // #[doc(keyword = "...")]
     (active, doc_keyword, "1.28.0", Some(51315), None),
 
@@ -466,7 +463,7 @@ declare_features! (
     (active, test_2018_feature, "1.31.0", Some(0), Some(Edition::Edition2018)),
 
     // Support for arbitrary delimited token streams in non-macro attributes
-    (active, unrestricted_attribute_tokens, "1.30.0", Some(44690), None),
+    (active, unrestricted_attribute_tokens, "1.30.0", Some(55208), None),
 
     // Allows `use x::y;` to resolve through `self::x`, not just `::x`
     (active, uniform_paths, "1.30.0", Some(53130), None),
@@ -503,7 +500,7 @@ declare_features! (
     (active, underscore_const_names, "1.31.0", Some(54912), None),
 
     // `extern crate foo as bar;` puts `bar` into extern prelude.
-    (active, extern_crate_item_prelude, "1.31.0", Some(54658), None),
+    (active, extern_crate_item_prelude, "1.31.0", Some(55599), None),
 
     // `reason = ` in lint attributes and `expect` lint attribute
     (active, lint_reasons, "1.31.0", Some(54503), None),
@@ -541,6 +538,8 @@ declare_features! (
      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
     (removed, proc_macro_gen, "1.27.0", Some(54727), None,
      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
+    (removed, panic_implementation, "1.28.0", Some(44489), None,
+     Some("subsumed by `#[panic_handler]`")),
 );
 
 declare_features! (
@@ -1160,16 +1159,6 @@ pub const BUILTIN_ATTRIBUTES: &'static [(&'static str, AttributeType, AttributeG
                                    "infer 'static lifetime requirements",
                                    cfg_fn!(infer_static_outlives_requirements))),
 
-    // RFC 2070 (deprecated attribute name)
-    ("panic_implementation",
-     Normal,
-     Gated(Stability::Deprecated("https://github.com/rust-lang/rust/issues/44489\
-                                  #issuecomment-415140224",
-                                 Some("replace this attribute with `#[panic_handler]`")),
-           "panic_implementation",
-           "this attribute was renamed to `panic_handler`",
-           cfg_fn!(panic_implementation))),
-
     // RFC 2070
     ("panic_handler", Normal, Ungated),
 

src/test/run-make/wasm-symbols-not-imported/foo.rs

@@ -9,8 +9,6 @@
 // except according to those terms.
 
 #![crate_type = "cdylib"]
-
-#![feature(panic_implementation)]
 #![no_std]
 
 use core::panic::PanicInfo;
@@ -20,7 +18,7 @@ pub extern fn foo() {
     panic!()
 }
 
-#[panic_implementation]
+#[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
     loop {}
 }

src/test/ui/panic-implementation/panic-implementation-deprecated.rs → src/test/run-pass/thread-local-not-in-prelude.rs

@@ -8,17 +8,11 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// compile-flags:-C panic=abort
-
-#![deny(deprecated)]
-#![feature(panic_implementation)]
 #![no_std]
 
-use core::panic::PanicInfo;
+extern crate std;
 
-#[panic_implementation]
-fn panic(info: &PanicInfo) -> ! {
-    loop {}
-}
+std::thread_local!(static A: usize = 30);
 
-fn main() {}
+fn main() {
+}