Auto merge of #49875 - kennytm:rollup, r=kennytm

Rollup of 14 pull requests

Successful merges:

 - #49525 (Use sort_by_cached_key where appropriate)
 - #49575 (Stabilize `Option::filter`.)
 - #49614 (in which the non-shorthand patterns lint keeps its own counsel in macros)
 - #49665 (Small nits to make couple of tests pass on mips targets.)
 - #49781 (add regression test for #16223 (NLL): use of collaterally moved value)
 - #49795 (Properly look for uninhabitedness of variants in niche-filling check)
 - #49809 (Stop emitting color codes on TERM=dumb)
 - #49856 (Do not uppercase-lint #[no_mangle] statics)
 - #49863 (fixed typo)
 - #49857 (Fix "fp" target feature for AArch64)
 - #49849 (Add --enable-debug flag to musl CI build script)
 - #49734 (proc_macro: Generalize `FromIterator` impl)
 - #49730 (Fix ICE with impl Trait)
 - #48270 (Replace `structurally_resolved_type` in casts check.)

Failed merges:

Author: bors

src/bootstrap/compile.rs

@@ -1167,7 +1167,9 @@ pub fn stream_cargo(
     cargo.arg("--message-format").arg("json")
          .stdout(Stdio::piped());
 
-    if stderr_isatty() && build.ci_env == CiEnv::None {
+    if stderr_isatty() && build.ci_env == CiEnv::None &&
+        // if the terminal is reported as dumb, then we don't want to enable color for rustc
+        env::var_os("TERM").map(|t| t != *"dumb").unwrap_or(true) {
         // since we pass message-format=json to cargo, we need to tell the rustc
         // wrapper to give us colored output if necessary. This is because we
         // only want Cargo's JSON output, not rustcs.

src/ci/docker/scripts/musl.sh

@@ -40,7 +40,7 @@ if [ ! -d $MUSL ]; then
 fi
 
 cd $MUSL
-./configure --disable-shared --prefix=/musl-$TAG $@
+./configure --enable-optimize --enable-debug --disable-shared --prefix=/musl-$TAG $@
 if [ "$TAG" = "i586" -o "$TAG" = "i686" ]; then
   hide_output make -j$(nproc) AR=ar RANLIB=ranlib
 else

src/liballoc/slice.rs

@@ -1400,6 +1400,7 @@ impl<T> [T] {
         let sz_usize = mem::size_of::<(K, usize)>();
 
         let len = self.len();
+        if len < 2 { return }
         if sz_u8  < sz_u16   && len <= ( u8::MAX as usize) { return sort_by_key!( u8, self, f) }
         if sz_u16 < sz_u32   && len <= (u16::MAX as usize) { return sort_by_key!(u16, self, f) }
         if sz_u32 < sz_usize && len <= (u32::MAX as usize) { return sort_by_key!(u32, self, f) }

src/libcore/option.rs

@@ -628,8 +628,6 @@ impl<T> Option<T> {
     /// # Examples
     ///
     /// ```rust
-    /// #![feature(option_filter)]
-    ///
     /// fn is_even(n: &i32) -> bool {
     ///     n % 2 == 0
     /// }
@@ -639,7 +637,7 @@ impl<T> Option<T> {
     /// assert_eq!(Some(4).filter(is_even), Some(4));
     /// ```
     #[inline]
-    #[unstable(feature = "option_filter", issue = "45860")]
+    #[stable(feature = "option_filter", since = "1.27.0")]
     pub fn filter<P: FnOnce(&T) -> bool>(self, predicate: P) -> Self {
         if let Some(x) = self {
             if predicate(&x) {

src/libproc_macro/lib.rs

@@ -140,9 +140,16 @@ impl From<TokenTree> for TokenStream {
 #[unstable(feature = "proc_macro", issue = "38356")]
 impl iter::FromIterator<TokenTree> for TokenStream {
     fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self {
+        trees.into_iter().map(TokenStream::from).collect()
+    }
+}
+
+#[unstable(feature = "proc_macro", issue = "38356")]
+impl iter::FromIterator<TokenStream> for TokenStream {
+    fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self {
         let mut builder = tokenstream::TokenStreamBuilder::new();
-        for tree in trees {
-            builder.push(tree.to_internal());
+        for stream in streams {
+            builder.push(stream.0);
         }
         TokenStream(builder.build())
     }

src/librustc/infer/anon_types/mod.rs

@@ -533,10 +533,14 @@ impl<'cx, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for ReverseMapper<'cx, 'gcx, 'tcx>
         match r {
             // ignore bound regions that appear in the type (e.g., this
             // would ignore `'r` in a type like `for<'r> fn(&'r u32)`.
-            ty::ReLateBound(..) => return r,
+            ty::ReLateBound(..) |
 
             // ignore `'static`, as that can appear anywhere
-            ty::ReStatic => return r,
+            ty::ReStatic |
+
+            // ignore `ReScope`, as that can appear anywhere
+            // See `src/test/run-pass/issue-49556.rs` for example.
+            ty::ReScope(..) => return r,
 
             _ => { }
         }

src/librustc/infer/error_reporting/mod.rs

@@ -181,7 +181,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                 self.msg_span_from_early_bound_and_free_regions(region)
             },
             ty::ReStatic => ("the static lifetime".to_owned(), None),
-            _ => bug!(),
+            _ => bug!("{:?}", region),
         }
     }
 

src/librustc/lib.rs

@@ -60,6 +60,7 @@
 #![feature(refcell_replace_swap)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(slice_patterns)]
+#![feature(slice_sort_by_cached_key)]
 #![feature(specialization)]
 #![feature(unboxed_closures)]
 #![feature(trace_macros)]

src/librustc/middle/cstore.rs

@@ -401,7 +401,7 @@ pub fn used_crates(tcx: TyCtxt, prefer: LinkagePreference)
         .collect::<Vec<_>>();
     let mut ordering = tcx.postorder_cnums(LOCAL_CRATE);
     Lrc::make_mut(&mut ordering).reverse();
-    libs.sort_by_key(|&(a, _)| {
+    libs.sort_by_cached_key(|&(a, _)| {
         ordering.iter().position(|x| *x == a)
     });
     libs

src/librustc/ty/cast.rs

@@ -20,7 +20,6 @@ use syntax::ast;
 pub enum IntTy {
     U(ast::UintTy),
     I,
-    Ivar,
     CEnum,
     Bool,
     Char
@@ -64,7 +63,7 @@ impl<'tcx> CastTy<'tcx> {
             ty::TyBool => Some(CastTy::Int(IntTy::Bool)),
             ty::TyChar => Some(CastTy::Int(IntTy::Char)),
             ty::TyInt(_) => Some(CastTy::Int(IntTy::I)),
-            ty::TyInfer(ty::InferTy::IntVar(_)) => Some(CastTy::Int(IntTy::Ivar)),
+            ty::TyInfer(ty::InferTy::IntVar(_)) => Some(CastTy::Int(IntTy::I)),
             ty::TyInfer(ty::InferTy::FloatVar(_)) => Some(CastTy::Float),
             ty::TyUint(u) => Some(CastTy::Int(IntTy::U(u))),
             ty::TyFloat(_) => Some(CastTy::Float),