Rollup of 6 pull requests

src/liballoc/lib.rs

@@ -171,3 +171,9 @@ pub mod vec;
 mod std {
     pub use core::ops; // RangeFull
 }
+
+#[doc(hidden)]
+#[unstable(feature = "liballoc_internals", issue = "0", reason = "implementation detail")]
+pub mod __export {
+    pub use core::format_args;
+}

src/liballoc/macros.rs

@@ -98,5 +98,5 @@ macro_rules! vec {
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
 macro_rules! format {
-    ($($arg:tt)*) => ($crate::fmt::format(::core::format_args!($($arg)*)))
+    ($($arg:tt)*) => ($crate::fmt::format($crate::__export::format_args!($($arg)*)))
 }

src/libcore/sync/atomic.rs

@@ -979,9 +979,8 @@ impl<T> AtomicPtr<T> {
     /// let some_ptr  = AtomicPtr::new(ptr);
     ///
     /// let other_ptr   = &mut 10;
-    /// let another_ptr = &mut 10;
     ///
-    /// let value = some_ptr.compare_and_swap(other_ptr, another_ptr, Ordering::Relaxed);
+    /// let value = some_ptr.compare_and_swap(ptr, other_ptr, Ordering::Relaxed);
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -1021,9 +1020,8 @@ impl<T> AtomicPtr<T> {
     /// let some_ptr  = AtomicPtr::new(ptr);
     ///
     /// let other_ptr   = &mut 10;
-    /// let another_ptr = &mut 10;
     ///
-    /// let value = some_ptr.compare_exchange(other_ptr, another_ptr,
+    /// let value = some_ptr.compare_exchange(ptr, other_ptr,
     ///                                       Ordering::SeqCst, Ordering::Relaxed);
     /// ```
     #[inline]

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

@@ -192,23 +192,28 @@ impl NiceRegionError<'me, 'tcx> {
             vid, sub_placeholder, sup_placeholder, trait_def_id, expected_substs, actual_substs
         );
 
-        let mut err = self.tcx().sess.struct_span_err(
-            cause.span(self.tcx()),
-            &format!(
-                "implementation of `{}` is not general enough",
-                self.tcx().def_path_str(trait_def_id),
-            ),
+        let span = cause.span(self.tcx());
+        let msg = format!(
+            "implementation of `{}` is not general enough",
+            self.tcx().def_path_str(trait_def_id),
+        );
+        let mut err = self.tcx().sess.struct_span_err(span, &msg);
+        err.span_label(
+            self.tcx().def_span(trait_def_id),
+            format!("trait `{}` defined here", self.tcx().def_path_str(trait_def_id)),
         );
 
-        match cause.code {
-            ObligationCauseCode::ItemObligation(def_id) => {
-                err.note(&format!(
-                    "Due to a where-clause on `{}`,",
-                    self.tcx().def_path_str(def_id),
-                ));
-            }
-            _ => (),
-        }
+        let leading_ellipsis = if let ObligationCauseCode::ItemObligation(def_id) = cause.code {
+            err.span_label(span, "doesn't satisfy where-clause");
+            err.span_label(
+                self.tcx().def_span(def_id),
+                &format!("due to a where-clause on `{}`...", self.tcx().def_path_str(def_id)),
+            );
+            true
+        } else {
+            err.span_label(span, &msg);
+            false
+        };
 
         let expected_trait_ref = self.infcx.resolve_vars_if_possible(&ty::TraitRef {
             def_id: trait_def_id,
@@ -295,6 +300,7 @@ impl NiceRegionError<'me, 'tcx> {
             expected_has_vid,
             actual_has_vid,
             any_self_ty_has_vid,
+            leading_ellipsis,
         );
 
         err
@@ -318,6 +324,7 @@ impl NiceRegionError<'me, 'tcx> {
         expected_has_vid: Option<usize>,
         actual_has_vid: Option<usize>,
         any_self_ty_has_vid: bool,
+        leading_ellipsis: bool,
     ) {
         // HACK(eddyb) maybe move this in a more central location.
         #[derive(Copy, Clone)]
@@ -392,13 +399,15 @@ impl NiceRegionError<'me, 'tcx> {
 
             let mut note = if passive_voice {
                 format!(
-                    "`{}` would have to be implemented for the type `{}`",
+                    "{}`{}` would have to be implemented for the type `{}`",
+                    if leading_ellipsis { "..." } else { "" },
                     expected_trait_ref,
                     expected_trait_ref.map(|tr| tr.self_ty()),
                 )
             } else {
                 format!(
-                    "`{}` must implement `{}`",
+                    "{}`{}` must implement `{}`",
+                    if leading_ellipsis { "..." } else { "" },
                     expected_trait_ref.map(|tr| tr.self_ty()),
                     expected_trait_ref,
                 )
@@ -407,20 +416,20 @@ impl NiceRegionError<'me, 'tcx> {
             match (has_sub, has_sup) {
                 (Some(n1), Some(n2)) => {
                     let _ = write!(note,
-                        ", for any two lifetimes `'{}` and `'{}`",
+                        ", for any two lifetimes `'{}` and `'{}`...",
                         std::cmp::min(n1, n2),
                         std::cmp::max(n1, n2),
                     );
                 }
                 (Some(n), _) | (_, Some(n)) => {
                     let _ = write!(note,
-                        ", for any lifetime `'{}`",
+                        ", for any lifetime `'{}`...",
                         n,
                     );
                 }
                 (None, None) => if let Some(n) = expected_has_vid {
                     let _ = write!(note,
-                        ", for some specific lifetime `'{}`",
+                        ", for some specific lifetime `'{}`...",
                         n,
                     );
                 },
@@ -439,13 +448,13 @@ impl NiceRegionError<'me, 'tcx> {
 
             let mut note = if passive_voice {
                 format!(
-                    "but `{}` is actually implemented for the type `{}`",
+                    "...but `{}` is actually implemented for the type `{}`",
                     actual_trait_ref,
                     actual_trait_ref.map(|tr| tr.self_ty()),
                 )
             } else {
                 format!(
-                    "but `{}` actually implements `{}`",
+                    "...but `{}` actually implements `{}`",
                     actual_trait_ref.map(|tr| tr.self_ty()),
                     actual_trait_ref,
                 )

src/librustc_target/spec/wasm32_wasi.rs

@@ -97,6 +97,10 @@ pub fn target() -> Result<Target, String> {
     options.crt_static_default = true;
     options.crt_static_respected = true;
 
+    // Allow `+crt-static` to create a "cdylib" output which is just a wasm file
+    // without a main function.
+    options.crt_static_allows_dylibs = true;
+
     Ok(Target {
         llvm_target: "wasm32-wasi".to_string(),
         target_endian: "little".to_string(),

src/librustdoc/markdown.rs

@@ -43,7 +43,7 @@ pub fn render(
     edition: Edition
 ) -> i32 {
     let mut output = options.output;
-    output.push(input.file_stem().unwrap());
+    output.push(input.file_name().unwrap());
     output.set_extension("html");
 
     let mut css = String::new();

src/libstd/sys/vxworks/fast_thread_local.rs

@@ -1,5 +1,3 @@
-// Copyright (c) 2019 Wind River Systems, Inc.
-
 #![cfg(target_thread_local)]
 #![unstable(feature = "thread_local_internals", issue = "0")]
 

src/libstd/sys/vxworks/process/process_vxworks.rs

@@ -5,6 +5,7 @@ use crate::sys;
 use crate::sys::cvt;
 use crate::sys::process::rtp;
 use crate::sys::process::process_common::*;
+use crate::sys_common::thread;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Command
@@ -57,8 +58,7 @@ impl Command {
                 self.get_argv().as_ptr() as *const _, // argv
                 *sys::os::environ() as *const *const c_char,
                 100 as c_int,                         // initial priority
-                0x16000,                                    // initial stack size. 0 defaults
-                                                      // to 0x4000 in 32 bit and 0x8000 in 64 bit
+                thread::min_stack(),                  // initial stack size.
                 0,                                    // options
                 0                                     // task options
             );

src/libstd/sys/vxworks/thread.rs

@@ -8,7 +8,7 @@ use crate::time::Duration;
 
 use crate::sys_common::thread::*;
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 0x40000; // 256K
 
 pub struct Thread {
     id: libc::pthread_t,

src/test/ui/generator/auto-trait-regions.stderr

@@ -1,20 +1,26 @@
 error: implementation of `Foo` is not general enough
   --> $DIR/auto-trait-regions.rs:30:5
    |
+LL | auto trait Foo {}
+   | ----------------- trait `Foo` defined here
+...
 LL |     assert_foo(gen);
-   |     ^^^^^^^^^^
+   |     ^^^^^^^^^^ implementation of `Foo` is not general enough
    |
-   = note: `Foo` would have to be implemented for the type `&'0 OnlyFooIfStaticRef`, for any lifetime `'0`
-   = note: but `Foo` is actually implemented for the type `&'1 OnlyFooIfStaticRef`, for some specific lifetime `'1`
+   = note: `Foo` would have to be implemented for the type `&'0 OnlyFooIfStaticRef`, for any lifetime `'0`...
+   = note: ...but `Foo` is actually implemented for the type `&'1 OnlyFooIfStaticRef`, for some specific lifetime `'1`
 
 error: implementation of `Foo` is not general enough
   --> $DIR/auto-trait-regions.rs:48:5
    |
+LL | auto trait Foo {}
+   | ----------------- trait `Foo` defined here
+...
 LL |     assert_foo(gen);
-   |     ^^^^^^^^^^
+   |     ^^^^^^^^^^ implementation of `Foo` is not general enough
    |
-   = note: `Foo` would have to be implemented for the type `A<'0, '1>`, for any two lifetimes `'0` and `'1`
-   = note: but `Foo` is actually implemented for the type `A<'_, '2>`, for some specific lifetime `'2`
+   = note: `Foo` would have to be implemented for the type `A<'0, '1>`, for any two lifetimes `'0` and `'1`...
+   = note: ...but `Foo` is actually implemented for the type `A<'_, '2>`, for some specific lifetime `'2`
 
 error: aborting due to 2 previous errors
 

src/test/ui/hrtb/due-to-where-clause.rs

@@ -0,0 +1,13 @@
+fn main() {
+    test::<FooS>(&mut 42); //~ ERROR implementation of `Foo` is not general enough
+}
+
+trait Foo<'a> {}
+
+struct FooS<'a> {
+    data: &'a mut u32,
+}
+
+impl<'a, 'b: 'a> Foo<'b> for FooS<'a> {}
+
+fn test<'a, F>(data: &'a mut u32) where F: for<'b> Foo<'b> {}

src/test/ui/hrtb/due-to-where-clause.stderr

@@ -0,0 +1,17 @@
+error: implementation of `Foo` is not general enough
+  --> $DIR/due-to-where-clause.rs:2:5
+   |
+LL |     test::<FooS>(&mut 42);
+   |     ^^^^^^^^^^^^ doesn't satisfy where-clause
+...
+LL | trait Foo<'a> {}
+   | ---------------- trait `Foo` defined here
+...
+LL | fn test<'a, F>(data: &'a mut u32) where F: for<'b> Foo<'b> {}
+   | ------------------------------------------------------------- due to a where-clause on `test`...
+   |
+   = note: ...`FooS<'_>` must implement `Foo<'0>`, for any lifetime `'0`...
+   = note: ...but `FooS<'_>` actually implements `Foo<'1>`, for some specific lifetime `'1`
+
+error: aborting due to previous error
+

src/test/ui/hrtb/hrtb-cache-issue-54302.stderr

@@ -1,11 +1,14 @@
 error: implementation of `Deserialize` is not general enough
   --> $DIR/hrtb-cache-issue-54302.rs:19:5
    |
+LL | trait Deserialize<'de> {}
+   | ------------------------- trait `Deserialize` defined here
+...
 LL |     assert_deserialize_owned::<&'static str>();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Deserialize` is not general enough
    |
-   = note: `&'static str` must implement `Deserialize<'0>`, for any lifetime `'0`
-   = note: but `&str` actually implements `Deserialize<'1>`, for some specific lifetime `'1`
+   = note: `&'static str` must implement `Deserialize<'0>`, for any lifetime `'0`...
+   = note: ...but `&str` actually implements `Deserialize<'1>`, for some specific lifetime `'1`
 
 error: aborting due to previous error
 

src/test/ui/hrtb/issue-30786.migrate.stderr

@@ -1,11 +1,17 @@
 error: implementation of `Stream` is not general enough
   --> $DIR/issue-30786.rs:108:22
    |
-LL |     let map = source.map(|x: &_| x);
-   |                      ^^^
+LL | / pub trait Stream {
+LL | |     type Item;
+LL | |     fn next(self) -> Option<Self::Item>;
+LL | | }
+   | |_- trait `Stream` defined here
+...
+LL |       let map = source.map(|x: &_| x);
+   |                        ^^^ implementation of `Stream` is not general enough
    |
-   = note: `Stream` would have to be implemented for the type `&'0 mut Map<Repeat, [closure@$DIR/issue-30786.rs:108:26: 108:35]>`, for any lifetime `'0`
-   = note: but `Stream` is actually implemented for the type `&'1 mut Map<Repeat, [closure@$DIR/issue-30786.rs:108:26: 108:35]>`, for some specific lifetime `'1`
+   = note: `Stream` would have to be implemented for the type `&'0 mut Map<Repeat, [closure@$DIR/issue-30786.rs:108:26: 108:35]>`, for any lifetime `'0`...
+   = note: ...but `Stream` is actually implemented for the type `&'1 mut Map<Repeat, [closure@$DIR/issue-30786.rs:108:26: 108:35]>`, for some specific lifetime `'1`
 
 error: aborting due to previous error
 

src/test/ui/hrtb/issue-30786.nll.stderr

@@ -1,11 +1,11 @@
 error: higher-ranked subtype error
-  --> $DIR/issue-30786.rs:112:18
+  --> $DIR/issue-30786.rs:113:18
    |
 LL |     let filter = map.filter(|x: &_| true);
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: higher-ranked subtype error
-  --> $DIR/issue-30786.rs:114:17
+  --> $DIR/issue-30786.rs:115:17
    |
 LL |     let count = filter.count(); // Assert that we still have a valid stream.
    |                 ^^^^^^^^^^^^^^

src/test/ui/hrtb/issue-30786.rs

@@ -16,7 +16,7 @@
 
 //[nll]compile-flags: -Z borrowck=mir
 
-pub trait Stream {
+pub trait Stream { //[migrate]~ NOTE trait `Stream` defined here
     type Item;
     fn next(self) -> Option<Self::Item>;
 }
@@ -109,6 +109,7 @@ fn main() {
     //[migrate]~^ ERROR implementation of `Stream` is not general enough
     //[migrate]~| NOTE  `Stream` would have to be implemented for the type `&'0 mut Map
     //[migrate]~| NOTE  but `Stream` is actually implemented for the type `&'1
+    //[migrate]~| NOTE  implementation of `Stream` is not general enough
     let filter = map.filter(|x: &_| true);
     //[nll]~^ ERROR higher-ranked subtype error
     let count = filter.count(); // Assert that we still have a valid stream.