Rollup of 7 pull requests

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -1213,8 +1213,41 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 deny_equality_constraints(self, predicate, generics);
             }
         }
-
-        visit::walk_generics(self, generics)
+        walk_list!(self, visit_generic_param, &generics.params);
+        for predicate in &generics.where_clause.predicates {
+            match predicate {
+                WherePredicate::BoundPredicate(bound_pred) => {
+                    // A type binding, eg `for<'c> Foo: Send+Clone+'c`
+                    self.check_late_bound_lifetime_defs(&bound_pred.bound_generic_params);
+
+                    // This is slightly complicated. Our representation for poly-trait-refs contains a single
+                    // binder and thus we only allow a single level of quantification. However,
+                    // the syntax of Rust permits quantification in two places in where clauses,
+                    // e.g., `T: for <'a> Foo<'a>` and `for <'a, 'b> &'b T: Foo<'a>`. If both are
+                    // defined, then error.
+                    if !bound_pred.bound_generic_params.is_empty() {
+                        for bound in &bound_pred.bounds {
+                            match bound {
+                                GenericBound::Trait(t, _) => {
+                                    if !t.bound_generic_params.is_empty() {
+                                        struct_span_err!(
+                                            self.err_handler(),
+                                            t.span,
+                                            E0316,
+                                            "nested quantification of lifetimes"
+                                        )
+                                        .emit();
+                                    }
+                                }
+                                GenericBound::Outlives(_) => {}
+                            }
+                        }
+                    }
+                }
+                _ => {}
+            }
+            self.visit_where_predicate(predicate);
+        }
     }
 
     fn visit_generic_param(&mut self, param: &'a GenericParam) {
@@ -1263,14 +1296,6 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
         visit::walk_pat(self, pat)
     }
 
-    fn visit_where_predicate(&mut self, p: &'a WherePredicate) {
-        if let &WherePredicate::BoundPredicate(ref bound_predicate) = p {
-            // A type binding, eg `for<'c> Foo: Send+Clone+'c`
-            self.check_late_bound_lifetime_defs(&bound_predicate.bound_generic_params);
-        }
-        visit::walk_where_predicate(self, p);
-    }
-
     fn visit_poly_trait_ref(&mut self, t: &'a PolyTraitRef, m: &'a TraitBoundModifier) {
         self.check_late_bound_lifetime_defs(&t.bound_generic_params);
         visit::walk_poly_trait_ref(self, t, m);

compiler/rustc_middle/src/middle/region.rs

@@ -235,18 +235,6 @@ pub struct ScopeTree {
     /// escape into 'static and should have no local cleanup scope.
     rvalue_scopes: FxHashMap<hir::ItemLocalId, Option<Scope>>,
 
-    /// Encodes the hierarchy of fn bodies. Every fn body (including
-    /// closures) forms its own distinct region hierarchy, rooted in
-    /// the block that is the fn body. This map points from the ID of
-    /// that root block to the ID of the root block for the enclosing
-    /// fn, if any. Thus the map structures the fn bodies into a
-    /// hierarchy based on their lexical mapping. This is used to
-    /// handle the relationships between regions in a fn and in a
-    /// closure defined by that fn. See the "Modeling closures"
-    /// section of the README in infer::region_constraints for
-    /// more details.
-    closure_tree: FxHashMap<hir::ItemLocalId, hir::ItemLocalId>,
-
     /// If there are any `yield` nested within a scope, this map
     /// stores the `Span` of the last one and its index in the
     /// postorder of the Visitor traversal on the HIR.
@@ -356,23 +344,6 @@ impl ScopeTree {
         self.destruction_scopes.get(&n).cloned()
     }
 
-    /// Records that `sub_closure` is defined within `sup_closure`. These IDs
-    /// should be the ID of the block that is the fn body, which is
-    /// also the root of the region hierarchy for that fn.
-    pub fn record_closure_parent(
-        &mut self,
-        sub_closure: hir::ItemLocalId,
-        sup_closure: hir::ItemLocalId,
-    ) {
-        debug!(
-            "record_closure_parent(sub_closure={:?}, sup_closure={:?})",
-            sub_closure, sup_closure
-        );
-        assert!(sub_closure != sup_closure);
-        let previous = self.closure_tree.insert(sub_closure, sup_closure);
-        assert!(previous.is_none());
-    }
-
     pub fn record_var_scope(&mut self, var: hir::ItemLocalId, lifetime: Scope) {
         debug!("record_var_scope(sub={:?}, sup={:?})", var, lifetime);
         assert!(var != lifetime.item_local_id());
@@ -474,7 +445,6 @@ impl<'a> HashStable<StableHashingContext<'a>> for ScopeTree {
             ref var_map,
             ref destruction_scopes,
             ref rvalue_scopes,
-            ref closure_tree,
             ref yield_in_scope,
         } = *self;
 
@@ -488,7 +458,6 @@ impl<'a> HashStable<StableHashingContext<'a>> for ScopeTree {
         var_map.hash_stable(hcx, hasher);
         destruction_scopes.hash_stable(hcx, hasher);
         rvalue_scopes.hash_stable(hcx, hasher);
-        closure_tree.hash_stable(hcx, hasher);
         yield_in_scope.hash_stable(hcx, hasher);
     }
 }

compiler/rustc_passes/src/region.rs

@@ -23,14 +23,6 @@ use std::mem;
 
 #[derive(Debug, Copy, Clone)]
 pub struct Context {
-    /// The root of the current region tree. This is typically the id
-    /// of the innermost fn body. Each fn forms its own disjoint tree
-    /// in the region hierarchy. These fn bodies are themselves
-    /// arranged into a tree. See the "Modeling closures" section of
-    /// the README in `rustc_trait_selection::infer::region_constraints`
-    /// for more details.
-    root_id: Option<hir::ItemLocalId>,
-
     /// The scope that contains any new variables declared, plus its depth in
     /// the scope tree.
     var_parent: Option<(Scope, ScopeDepth)>,
@@ -743,11 +735,6 @@ impl<'tcx> Visitor<'tcx> for RegionResolutionVisitor<'tcx> {
         let outer_pessimistic_yield = mem::replace(&mut self.pessimistic_yield, false);
         self.terminating_scopes.insert(body.value.hir_id.local_id);
 
-        if let Some(root_id) = self.cx.root_id {
-            self.scope_tree.record_closure_parent(body.value.hir_id.local_id, root_id);
-        }
-        self.cx.root_id = Some(body.value.hir_id.local_id);
-
         self.enter_scope(Scope { id: body.value.hir_id.local_id, data: ScopeData::CallSite });
         self.enter_scope(Scope { id: body.value.hir_id.local_id, data: ScopeData::Arguments });
 
@@ -824,7 +811,7 @@ fn region_scope_tree(tcx: TyCtxt<'_>, def_id: DefId) -> &ScopeTree {
             tcx,
             scope_tree: ScopeTree::default(),
             expr_and_pat_count: 0,
-            cx: Context { root_id: None, parent: None, var_parent: None },
+            cx: Context { parent: None, var_parent: None },
             terminating_scopes: Default::default(),
             pessimistic_yield: false,
             fixup_scopes: vec![],

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -439,8 +439,7 @@ fn virtual_call_violation_for_method<'tcx>(
         return Some(MethodViolationCode::WhereClauseReferencesSelf);
     }
 
-    let receiver_ty =
-        tcx.liberate_late_bound_regions(method.def_id, sig.map_bound(|sig| sig.inputs()[0]));
+    let receiver_ty = tcx.liberate_late_bound_regions(method.def_id, sig.input(0));
 
     // Until `unsized_locals` is fully implemented, `self: Self` can't be dispatched on.
     // However, this is already considered object-safe. We allow it as a special case here.

compiler/rustc_typeck/src/check/coercion.rs

@@ -973,6 +973,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
         };
         if let (Some(a_sig), Some(b_sig)) = (a_sig, b_sig) {
+            // Intrinsics are not coercible to function pointers.
+            if a_sig.abi() == Abi::RustIntrinsic
+                || a_sig.abi() == Abi::PlatformIntrinsic
+                || b_sig.abi() == Abi::RustIntrinsic
+                || b_sig.abi() == Abi::PlatformIntrinsic
+            {
+                return Err(TypeError::IntrinsicCast);
+            }
             // The signature must match.
             let a_sig = self.normalize_associated_types_in(new.span, a_sig);
             let b_sig = self.normalize_associated_types_in(new.span, b_sig);

library/std/src/env.rs

@@ -799,7 +799,7 @@ impl DoubleEndedIterator for Args {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Args {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Args").field("inner", &self.inner.inner.inner_debug()).finish()
+        f.debug_struct("Args").field("inner", &self.inner.inner).finish()
     }
 }
 
@@ -840,7 +840,7 @@ impl DoubleEndedIterator for ArgsOs {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ArgsOs {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("ArgsOs").field("inner", &self.inner.inner_debug()).finish()
+        f.debug_struct("ArgsOs").field("inner", &self.inner).finish()
     }
 }
 

library/std/src/sys/hermit/args.rs

@@ -1,4 +1,5 @@
 use crate::ffi::OsString;
+use crate::fmt;
 use crate::marker::PhantomData;
 use crate::vec;
 
@@ -22,9 +23,9 @@ pub struct Args {
     _dont_send_or_sync_me: PhantomData<*mut ()>,
 }
 
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        self.iter.as_slice()
+impl fmt::Debug for Args {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.iter.as_slice().fmt(f)
     }
 }
 

library/std/src/sys/sgx/args.rs

@@ -1,5 +1,6 @@
 use super::abi::usercalls::{alloc, raw::ByteBuffer};
 use crate::ffi::OsString;
+use crate::fmt;
 use crate::slice;
 use crate::sync::atomic::{AtomicUsize, Ordering};
 use crate::sys::os_str::Buf;
@@ -31,9 +32,9 @@ pub fn args() -> Args {
 
 pub struct Args(slice::Iter<'static, OsString>);
 
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        self.0.as_slice()
+impl fmt::Debug for Args {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.as_slice().fmt(f)
     }
 }
 

library/std/src/sys/unix/args.rs

@@ -6,6 +6,7 @@
 #![allow(dead_code)] // runtime init functions not used during testing
 
 use crate::ffi::OsString;
+use crate::fmt;
 use crate::marker::PhantomData;
 use crate::vec;
 
@@ -29,9 +30,9 @@ pub struct Args {
     _dont_send_or_sync_me: PhantomData<*mut ()>,
 }
 
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        self.iter.as_slice()
+impl fmt::Debug for Args {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.iter.as_slice().fmt(f)
     }
 }
 

library/std/src/sys/unix/os.rs

@@ -21,8 +21,8 @@ use crate::slice;
 use crate::str;
 use crate::sys::cvt;
 use crate::sys::fd;
+use crate::sys::rwlock::{RWLockReadGuard, StaticRWLock};
 use crate::sys_common::mutex::{StaticMutex, StaticMutexGuard};
-use crate::sys_common::rwlock::{RWLockReadGuard, StaticRWLock};
 use crate::vec;
 
 use libc::{c_char, c_int, c_void};

library/std/src/sys/unix/rwlock.rs

@@ -139,3 +139,55 @@ impl RWLock {
         }
     }
 }
+
+pub struct StaticRWLock(RWLock);
+
+impl StaticRWLock {
+    pub const fn new() -> StaticRWLock {
+        StaticRWLock(RWLock::new())
+    }
+
+    /// Acquires shared access to the underlying lock, blocking the current
+    /// thread to do so.
+    ///
+    /// The lock is automatically unlocked when the returned guard is dropped.
+    #[inline]
+    pub fn read_with_guard(&'static self) -> RWLockReadGuard {
+        // SAFETY: All methods require static references, therefore self
+        // cannot be moved between invocations.
+        unsafe {
+            self.0.read();
+        }
+        RWLockReadGuard(&self.0)
+    }
+
+    /// Acquires write access to the underlying lock, blocking the current thread
+    /// to do so.
+    ///
+    /// The lock is automatically unlocked when the returned guard is dropped.
+    #[inline]
+    pub fn write_with_guard(&'static self) -> RWLockWriteGuard {
+        // SAFETY: All methods require static references, therefore self
+        // cannot be moved between invocations.
+        unsafe {
+            self.0.write();
+        }
+        RWLockWriteGuard(&self.0)
+    }
+}
+
+pub struct RWLockReadGuard(&'static RWLock);
+
+impl Drop for RWLockReadGuard {
+    fn drop(&mut self) {
+        unsafe { self.0.read_unlock() }
+    }
+}
+
+pub struct RWLockWriteGuard(&'static RWLock);
+
+impl Drop for RWLockWriteGuard {
+    fn drop(&mut self) {
+        unsafe { self.0.write_unlock() }
+    }
+}

library/std/src/sys/unsupported/args.rs

@@ -9,9 +9,9 @@ pub fn args() -> Args {
     Args {}
 }
 
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        &[]
+impl fmt::Debug for Args {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_list().finish()
     }
 }
 

library/std/src/sys/wasi/args.rs

@@ -1,6 +1,7 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 
 use crate::ffi::{CStr, OsStr, OsString};
+use crate::fmt;
 use crate::marker::PhantomData;
 use crate::os::wasi::ffi::OsStrExt;
 use crate::vec;
@@ -38,9 +39,9 @@ fn maybe_args() -> Option<Vec<OsString>> {
     }
 }
 
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        self.iter.as_slice()
+impl fmt::Debug for Args {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.iter.as_slice().fmt(f)
     }
 }
 

library/std/src/sys/wasm/args.rs

@@ -1,4 +1,5 @@
 use crate::ffi::OsString;
+use crate::fmt;
 use crate::marker::PhantomData;
 use crate::vec;
 
@@ -17,9 +18,9 @@ pub struct Args {
     _dont_send_or_sync_me: PhantomData<*mut ()>,
 }
 
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        self.iter.as_slice()
+impl fmt::Debug for Args {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.iter.as_slice().fmt(f)
     }
 }
 

library/std/src/sys/windows/args.rs

@@ -164,19 +164,9 @@ pub struct Args {
     parsed_args_list: vec::IntoIter<OsString>,
 }
 
-pub struct ArgsInnerDebug<'a> {
-    args: &'a Args,
-}
-
-impl<'a> fmt::Debug for ArgsInnerDebug<'a> {
+impl fmt::Debug for Args {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.args.parsed_args_list.as_slice().fmt(f)
-    }
-}
-
-impl Args {
-    pub fn inner_debug(&self) -> ArgsInnerDebug<'_> {
-        ArgsInnerDebug { args: self }
+        self.parsed_args_list.as_slice().fmt(f)
     }
 }
 

library/std/src/sys_common/rwlock.rs

@@ -86,62 +86,3 @@ impl RWLock {
         self.0.destroy()
     }
 }
-
-// the cfg annotations only exist due to dead code warnings. the code itself is portable
-#[cfg(unix)]
-pub struct StaticRWLock(RWLock);
-
-#[cfg(unix)]
-impl StaticRWLock {
-    pub const fn new() -> StaticRWLock {
-        StaticRWLock(RWLock::new())
-    }
-
-    /// Acquires shared access to the underlying lock, blocking the current
-    /// thread to do so.
-    ///
-    /// The lock is automatically unlocked when the returned guard is dropped.
-    #[inline]
-    pub fn read_with_guard(&'static self) -> RWLockReadGuard {
-        // SAFETY: All methods require static references, therefore self
-        // cannot be moved between invocations.
-        unsafe {
-            self.0.read();
-        }
-        RWLockReadGuard(&self.0)
-    }
-
-    /// Acquires write access to the underlying lock, blocking the current thread
-    /// to do so.
-    ///
-    /// The lock is automatically unlocked when the returned guard is dropped.
-    #[inline]
-    pub fn write_with_guard(&'static self) -> RWLockWriteGuard {
-        // SAFETY: All methods require static references, therefore self
-        // cannot be moved between invocations.
-        unsafe {
-            self.0.write();
-        }
-        RWLockWriteGuard(&self.0)
-    }
-}
-
-#[cfg(unix)]
-pub struct RWLockReadGuard(&'static RWLock);
-
-#[cfg(unix)]
-impl Drop for RWLockReadGuard {
-    fn drop(&mut self) {
-        unsafe { self.0.read_unlock() }
-    }
-}
-
-#[cfg(unix)]
-pub struct RWLockWriteGuard(&'static RWLock);
-
-#[cfg(unix)]
-impl Drop for RWLockWriteGuard {
-    fn drop(&mut self) {
-        unsafe { self.0.write_unlock() }
-    }
-}

src/librustdoc/html/static/rustdoc.css

@@ -116,6 +116,8 @@ h4:not(.method):not(.type):not(.tymethod):not(.associatedconstant) {
 	padding-bottom: 6px;
 }
 h1.fqn {
+	display: flex;
+	width: 100%;
 	border-bottom: 1px dashed;
 	margin-top: 0;
 }
@@ -458,6 +460,13 @@ nav.sub {
 	font-weight: normal;
 }
 
+h1.fqn > .out-of-band {
+	float: unset;
+	flex: 1;
+	text-align: right;
+	margin-left: 8px;
+}
+
 h3.impl > .out-of-band {
 	font-size: 21px;
 }
@@ -1450,10 +1459,6 @@ h4 > .notable-traits {
 		padding: 0;
 	}
 
-	.content .in-band {
-		width: 100%;
-	}
-
 	.content h4 > .out-of-band {
 		position: inherit;
 	}

src/test/ui/reify-intrinsic.rs

@@ -12,4 +12,12 @@ fn b() {
     //~^ ERROR casting
 }
 
+fn c() {
+    let _ = [
+        std::intrinsics::copy_nonoverlapping::<i32>,
+        std::intrinsics::copy::<i32>,
+        //~^ ERROR cannot coerce
+    ];
+}
+
 fn main() {}

src/test/ui/reify-intrinsic.stderr

@@ -19,7 +19,16 @@ error[E0606]: casting `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_,
 LL |     let _ = std::mem::transmute as unsafe extern "rust-intrinsic" fn(isize) -> usize;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error[E0308]: cannot coerce intrinsics to function pointers
+  --> $DIR/reify-intrinsic.rs:18:9
+   |
+LL |         std::intrinsics::copy::<i32>,
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers
+   |
+   = note: expected type `unsafe extern "rust-intrinsic" fn(_, _, _) {copy_nonoverlapping::<i32>}`
+           found fn item `unsafe extern "rust-intrinsic" fn(_, _, _) {std::intrinsics::copy::<i32>}`
+
+error: aborting due to 3 previous errors
 
 Some errors have detailed explanations: E0308, E0606.
 For more information about an error, try `rustc --explain E0308`.