Auto merge of #103026 - matthiaskrgr:rollup-gfmlfkt, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #103000 (Add suggestion to the "missing native library" error)
 - #103006 (rustdoc: don't ICE on `TyKind::Typeof`)
 - #103008 (replace ReErased with fresh region vars in opaque types)
 - #103011 (Improve rustdoc `unsafe-fn` GUI test)
 - #103013 (Add new bootstrap entrypoints to triagebot)
 - #103016 (Ensure enum cast moves)
 - #103021 (Add links to relevant pages to find constraint information)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_codegen_llvm/src/asm.rs

@@ -551,6 +551,8 @@ fn reg_to_llvm(reg: InlineAsmRegOrRegClass, layout: Option<&TyAndLayout<'_>>) ->
                 format!("{{{}}}", reg.name())
             }
         }
+        // The constraints can be retrieved from
+        // https://llvm.org/docs/LangRef.html#supported-constraint-code-list
         InlineAsmRegOrRegClass::RegClass(reg) => match reg {
             InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => "r",
             InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg) => "w",
@@ -624,6 +626,8 @@ fn modifier_to_llvm(
     reg: InlineAsmRegClass,
     modifier: Option<char>,
 ) -> Option<char> {
+    // The modifiers can be retrieved from
+    // https://llvm.org/docs/LangRef.html#asm-template-argument-modifiers
     match reg {
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => modifier,
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg)

compiler/rustc_error_messages/locales/en-US/metadata.ftl

@@ -165,6 +165,8 @@ metadata_failed_write_error =
 metadata_missing_native_library =
     could not find native static library `{$libname}`, perhaps an -L flag is missing?
 
+metadata_only_provide_library_name = only provide the library name `{$suggested_name}`, not the full filename
+
 metadata_failed_create_tempdir =
     couldn't create a temp dir: {$err}
 

compiler/rustc_hir_analysis/src/check/check.rs

@@ -732,8 +732,6 @@ fn check_opaque_meets_bounds<'tcx>(
     span: Span,
     origin: &hir::OpaqueTyOrigin,
 ) {
-    let hidden_type = tcx.bound_type_of(def_id.to_def_id()).subst(tcx, substs);
-
     let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
     let defining_use_anchor = match *origin {
         hir::OpaqueTyOrigin::FnReturn(did) | hir::OpaqueTyOrigin::AsyncFn(did) => did,
@@ -748,14 +746,26 @@ fn check_opaque_meets_bounds<'tcx>(
     let ocx = ObligationCtxt::new(&infcx);
     let opaque_ty = tcx.mk_opaque(def_id.to_def_id(), substs);
 
+    // `ReErased` regions appear in the "parent_substs" of closures/generators.
+    // We're ignoring them here and replacing them with fresh region variables.
+    // See tests in ui/type-alias-impl-trait/closure_{parent_substs,wf_outlives}.rs.
+    //
+    // FIXME: Consider wrapping the hidden type in an existential `Binder` and instantiating it
+    // here rather than using ReErased.
+    let hidden_ty = tcx.bound_type_of(def_id.to_def_id()).subst(tcx, substs);
+    let hidden_ty = tcx.fold_regions(hidden_ty, |re, _dbi| match re.kind() {
+        ty::ReErased => infcx.next_region_var(RegionVariableOrigin::MiscVariable(span)),
+        _ => re,
+    });
+
     let misc_cause = traits::ObligationCause::misc(span, hir_id);
 
-    match infcx.at(&misc_cause, param_env).eq(opaque_ty, hidden_type) {
+    match infcx.at(&misc_cause, param_env).eq(opaque_ty, hidden_ty) {
         Ok(infer_ok) => ocx.register_infer_ok_obligations(infer_ok),
         Err(ty_err) => {
             tcx.sess.delay_span_bug(
                 span,
-                &format!("could not unify `{hidden_type}` with revealed type:\n{ty_err}"),
+                &format!("could not unify `{hidden_ty}` with revealed type:\n{ty_err}"),
             );
         }
     }
@@ -764,7 +774,7 @@ fn check_opaque_meets_bounds<'tcx>(
     // Defining use functions may have more bounds than the opaque type, which is ok, as long as the
     // hidden type is well formed even without those bounds.
     let predicate =
-        ty::Binder::dummy(ty::PredicateKind::WellFormed(hidden_type.into())).to_predicate(tcx);
+        ty::Binder::dummy(ty::PredicateKind::WellFormed(hidden_ty.into())).to_predicate(tcx);
     ocx.register_obligation(Obligation::new(misc_cause, param_env, predicate));
 
     // Check that all obligations are satisfied by the implementation's

compiler/rustc_metadata/src/errors.rs

@@ -372,7 +372,41 @@ pub struct FailedWriteError {
 #[derive(Diagnostic)]
 #[diag(metadata::missing_native_library)]
 pub struct MissingNativeLibrary<'a> {
-    pub libname: &'a str,
+    libname: &'a str,
+    #[subdiagnostic]
+    suggest_name: Option<SuggestLibraryName<'a>>,
+}
+
+impl<'a> MissingNativeLibrary<'a> {
+    pub fn new(libname: &'a str, verbatim: bool) -> Self {
+        // if it looks like the user has provided a complete filename rather just the bare lib name,
+        // then provide a note that they might want to try trimming the name
+        let suggested_name = if !verbatim {
+            if let Some(libname) = libname.strip_prefix("lib") && let Some(libname) = libname.strip_suffix(".a") {
+                // this is a unix style filename so trim prefix & suffix
+                Some(libname)
+            } else if let Some(libname) = libname.strip_suffix(".lib") {
+                // this is a Windows style filename so just trim the suffix
+                Some(libname)
+            } else {
+                None
+            }
+        } else {
+            None
+        };
+
+        Self {
+            libname,
+            suggest_name: suggested_name
+                .map(|suggested_name| SuggestLibraryName { suggested_name }),
+        }
+    }
+}
+
+#[derive(Subdiagnostic)]
+#[help(metadata::only_provide_library_name)]
+pub struct SuggestLibraryName<'a> {
+    suggested_name: &'a str,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_metadata/src/native_libs.rs

@@ -52,7 +52,7 @@ pub fn find_native_static_library(
         }
     }
 
-    sess.emit_fatal(MissingNativeLibrary { libname: name });
+    sess.emit_fatal(MissingNativeLibrary::new(name, verbatim.unwrap_or(false)));
 }
 
 fn find_bundled_library(

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -197,13 +197,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 // create all the steps directly in MIR with operations all backends need to support anyway.
                 let (source, ty) = if let ty::Adt(adt_def, ..) = source.ty.kind() && adt_def.is_enum() {
                     let discr_ty = adt_def.repr().discr_type().to_ty(this.tcx);
-                    let place = unpack!(block = this.as_place(block, source));
+                    let temp = unpack!(block = this.as_temp(block, scope, source, Mutability::Not));
                     let discr = this.temp(discr_ty, source.span);
                     this.cfg.push_assign(
                         block,
                         source_info,
                         discr,
-                        Rvalue::Discriminant(place),
+                        Rvalue::Discriminant(temp.into()),
                     );
 
                     (Operand::Move(discr), discr_ty)

src/ci/docker/host-x86_64/x86_64-gnu-tools/browser-ui-test.version

@@ -1 +1 @@
-0.12.2
+0.12.3

src/librustdoc/clean/mod.rs

@@ -1543,8 +1543,7 @@ pub(crate) fn clean_ty<'tcx>(ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> T
         }
         TyKind::BareFn(barefn) => BareFunction(Box::new(clean_bare_fn_ty(barefn, cx))),
         // Rustdoc handles `TyKind::Err`s by turning them into `Type::Infer`s.
-        TyKind::Infer | TyKind::Err => Infer,
+        TyKind::Infer | TyKind::Err | TyKind::Typeof(..) => Infer,
-        TyKind::Typeof(..) => panic!("unimplemented type {:?}", ty.kind),
     }
 }
 

src/test/mir-opt/enum_cast.bar.mir_map.0.mir

@@ -3,11 +3,15 @@
 fn bar(_1: Bar) -> usize {
     debug bar => _1;                     // in scope 0 at $DIR/enum_cast.rs:+0:8: +0:11
     let mut _0: usize;                   // return place in scope 0 at $DIR/enum_cast.rs:+0:21: +0:26
-    let mut _2: isize;                   // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+    let _2: Bar;                         // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+    let mut _3: isize;                   // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
 
     bb0: {
-        _2 = discriminant(_1);           // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        StorageLive(_2);                 // scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
-        _0 = move _2 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        _2 = move _1;                    // scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+        _3 = discriminant(_2);           // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        _0 = move _3 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        StorageDead(_2);                 // scope 0 at $DIR/enum_cast.rs:+1:16: +1:17
         return;                          // scope 0 at $DIR/enum_cast.rs:+2:2: +2:2
     }
 }

src/test/mir-opt/enum_cast.boo.mir_map.0.mir

@@ -3,11 +3,15 @@
 fn boo(_1: Boo) -> usize {
     debug boo => _1;                     // in scope 0 at $DIR/enum_cast.rs:+0:8: +0:11
     let mut _0: usize;                   // return place in scope 0 at $DIR/enum_cast.rs:+0:21: +0:26
-    let mut _2: u8;                      // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+    let _2: Boo;                         // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+    let mut _3: u8;                      // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
 
     bb0: {
-        _2 = discriminant(_1);           // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        StorageLive(_2);                 // scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
-        _0 = move _2 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        _2 = move _1;                    // scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+        _3 = discriminant(_2);           // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        _0 = move _3 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        StorageDead(_2);                 // scope 0 at $DIR/enum_cast.rs:+1:16: +1:17
         return;                          // scope 0 at $DIR/enum_cast.rs:+2:2: +2:2
     }
 }

src/test/mir-opt/enum_cast.droppy.mir_map.0.mir

@@ -4,8 +4,9 @@ fn droppy() -> () {
     let mut _0: ();                      // return place in scope 0 at $DIR/enum_cast.rs:+0:13: +0:13
     let _1: ();                          // in scope 0 at $DIR/enum_cast.rs:+1:5: +6:6
     let _2: Droppy;                      // in scope 0 at $DIR/enum_cast.rs:+2:13: +2:14
-    let mut _4: isize;                   // in scope 0 at $DIR/enum_cast.rs:+5:17: +5:18
+    let _4: Droppy;                      // in scope 0 at $DIR/enum_cast.rs:+5:17: +5:18
-    let _5: Droppy;                      // in scope 0 at $DIR/enum_cast.rs:+7:9: +7:10
+    let mut _5: isize;                   // in scope 0 at $DIR/enum_cast.rs:+5:17: +5:18
+    let _6: Droppy;                      // in scope 0 at $DIR/enum_cast.rs:+7:9: +7:10
     scope 1 {
         debug x => _2;                   // in scope 1 at $DIR/enum_cast.rs:+2:13: +2:14
         scope 2 {
@@ -16,7 +17,7 @@ fn droppy() -> () {
         }
     }
     scope 4 {
-        debug z => _5;                   // in scope 4 at $DIR/enum_cast.rs:+7:9: +7:10
+        debug z => _6;                   // in scope 4 at $DIR/enum_cast.rs:+7:9: +7:10
     }
 
     bb0: {
@@ -25,30 +26,41 @@ fn droppy() -> () {
         _2 = Droppy::C;                  // scope 0 at $DIR/enum_cast.rs:+2:17: +2:26
         FakeRead(ForLet(None), _2);      // scope 0 at $DIR/enum_cast.rs:+2:13: +2:14
         StorageLive(_3);                 // scope 3 at $DIR/enum_cast.rs:+5:13: +5:14
-        _4 = discriminant(_2);           // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
+        StorageLive(_4);                 // scope 3 at $DIR/enum_cast.rs:+5:17: +5:18
-        _3 = move _4 as usize (IntToInt); // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
+        _4 = move _2;                    // scope 3 at $DIR/enum_cast.rs:+5:17: +5:18
-        FakeRead(ForLet(None), _3);      // scope 3 at $DIR/enum_cast.rs:+5:13: +5:14
+        _5 = discriminant(_4);           // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
-        _1 = const ();                   // scope 0 at $DIR/enum_cast.rs:+1:5: +6:6
+        _3 = move _5 as usize (IntToInt); // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
-        StorageDead(_3);                 // scope 1 at $DIR/enum_cast.rs:+6:5: +6:6
+        drop(_4) -> [return: bb1, unwind: bb4]; // scope 3 at $DIR/enum_cast.rs:+5:26: +5:27
-        drop(_2) -> [return: bb1, unwind: bb3]; // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
     }
 
     bb1: {
-        StorageDead(_2);                 // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
+        StorageDead(_4);                 // scope 3 at $DIR/enum_cast.rs:+5:26: +5:27
-        StorageDead(_1);                 // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
+        FakeRead(ForLet(None), _3);      // scope 3 at $DIR/enum_cast.rs:+5:13: +5:14
-        StorageLive(_5);                 // scope 0 at $DIR/enum_cast.rs:+7:9: +7:10
+        _1 = const ();                   // scope 0 at $DIR/enum_cast.rs:+1:5: +6:6
-        _5 = Droppy::B;                  // scope 0 at $DIR/enum_cast.rs:+7:13: +7:22
+        StorageDead(_3);                 // scope 1 at $DIR/enum_cast.rs:+6:5: +6:6
-        FakeRead(ForLet(None), _5);      // scope 0 at $DIR/enum_cast.rs:+7:9: +7:10
+        drop(_2) -> [return: bb2, unwind: bb5]; // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
-        _0 = const ();                   // scope 0 at $DIR/enum_cast.rs:+0:13: +8:2
-        drop(_5) -> [return: bb2, unwind: bb3]; // scope 0 at $DIR/enum_cast.rs:+8:1: +8:2
     }
 
     bb2: {
-        StorageDead(_5);                 // scope 0 at $DIR/enum_cast.rs:+8:1: +8:2
+        StorageDead(_2);                 // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
+        StorageDead(_1);                 // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
+        StorageLive(_6);                 // scope 0 at $DIR/enum_cast.rs:+7:9: +7:10
+        _6 = Droppy::B;                  // scope 0 at $DIR/enum_cast.rs:+7:13: +7:22
+        FakeRead(ForLet(None), _6);      // scope 0 at $DIR/enum_cast.rs:+7:9: +7:10
+        _0 = const ();                   // scope 0 at $DIR/enum_cast.rs:+0:13: +8:2
+        drop(_6) -> [return: bb3, unwind: bb5]; // scope 0 at $DIR/enum_cast.rs:+8:1: +8:2
+    }
+
+    bb3: {
+        StorageDead(_6);                 // scope 0 at $DIR/enum_cast.rs:+8:1: +8:2
         return;                          // scope 0 at $DIR/enum_cast.rs:+8:2: +8:2
     }
 
-    bb3 (cleanup): {
+    bb4 (cleanup): {
+        drop(_2) -> bb5;                 // scope 0 at $DIR/enum_cast.rs:+6:5: +6:6
+    }
+
+    bb5 (cleanup): {
         resume;                          // scope 0 at $DIR/enum_cast.rs:+0:1: +8:2
     }
 }

src/test/mir-opt/enum_cast.foo.mir_map.0.mir

@@ -3,11 +3,15 @@
 fn foo(_1: Foo) -> usize {
     debug foo => _1;                     // in scope 0 at $DIR/enum_cast.rs:+0:8: +0:11
     let mut _0: usize;                   // return place in scope 0 at $DIR/enum_cast.rs:+0:21: +0:26
-    let mut _2: isize;                   // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+    let _2: Foo;                         // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+    let mut _3: isize;                   // in scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
 
     bb0: {
-        _2 = discriminant(_1);           // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        StorageLive(_2);                 // scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
-        _0 = move _2 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        _2 = move _1;                    // scope 0 at $DIR/enum_cast.rs:+1:5: +1:8
+        _3 = discriminant(_2);           // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        _0 = move _3 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
+        StorageDead(_2);                 // scope 0 at $DIR/enum_cast.rs:+1:16: +1:17
         return;                          // scope 0 at $DIR/enum_cast.rs:+2:2: +2:2
     }
 }

src/test/run-pass-valgrind/cast-enum-with-dtor.rs

@@ -28,7 +28,7 @@ fn main() {
     {
         let e = E::C;
         assert_eq!(e as u32, 2);
-        assert_eq!(FLAG.load(Ordering::SeqCst), 0);
+        assert_eq!(FLAG.load(Ordering::SeqCst), 1);
     }
     assert_eq!(FLAG.load(Ordering::SeqCst), 1);
 }

src/test/rustdoc-gui/unsafe-fn.goml

@@ -1,37 +1,28 @@
+// Check position and color of the `<sup>` for unsafe elements.
 goto: "file://" + |DOC_PATH| + "/test_docs/index.html"
-
-compare-elements-property: (
-	"//a[@title='test_docs::safe_fn fn']/..",
-	"//a[@title='test_docs::unsafe_fn fn']/..",
-	["clientHeight"]
-)
-
 // If the text isn't displayed, the browser doesn't compute color style correctly...
 show-text: true
 
-// Set the theme to dark.
+compare-elements-property: (
-local-storage: {"rustdoc-theme": "dark", "rustdoc-preferred-dark-theme": "dark", "rustdoc-use-system-theme": "false"}
+    "//a[@title='test_docs::safe_fn fn']/..",
-// We reload the page so the local storage settings are being used.
+    "//a[@title='test_docs::unsafe_fn fn']/..",
-reload:
+    ["clientHeight"]
+)
 
-assert-css: (".item-left sup", {
+define-function: (
-	"color": "rgb(221, 221, 221)"
+    "sup-check",
-})
+    // `theme` is the theme being tested.
+    // `color` is the expected color of the `<sup>` element.
+    (theme, color),
+    [
+        // Set the theme.
+        ("local-storage", {"rustdoc-theme": |theme|, "rustdoc-use-system-theme": "false"}),
+        // We reload the page so the local storage settings are being used.
+        ("reload"),
+        ("assert-css", (".item-left sup", {"color": |color|})),
+    ],
+)
 
-// Set the theme to ayu.
+call-function: ("sup-check", ("dark", "rgb(221, 221, 221)"))
-local-storage: {"rustdoc-theme": "ayu", "rustdoc-preferred-dark-theme": "ayu", "rustdoc-use-system-theme": "false"}
+call-function: ("sup-check", ("ayu", "rgb(197, 197, 197)"))
-// We reload the page so the local storage settings are being used.
+call-function: ("sup-check", ("light", "rgb(0, 0, 0)"))
-reload:
-
-assert-css: (".item-left sup", {
-	"color": "rgb(197, 197, 197)"
-})
-
-// Set the theme to light.
-local-storage: {"rustdoc-theme": "light", "rustdoc-preferred-dark-theme": "light", "rustdoc-use-system-theme": "false"}
-// We reload the page so the local storage settings are being used.
-reload:
-
-assert-css: (".item-left sup", {
-	"color": "rgb(0, 0, 0)"
-})

src/test/rustdoc-ui/issue-102986.rs

@@ -0,0 +1,4 @@
+struct Struct {
+    y: (typeof("hey"),),
+    //~^ `typeof` is a reserved keyword but unimplemented
+}

src/test/rustdoc-ui/issue-102986.stderr

@@ -0,0 +1,14 @@
+error[E0516]: `typeof` is a reserved keyword but unimplemented
+  --> $DIR/issue-102986.rs:2:9
+   |
+LL |     y: (typeof("hey"),),
+   |         ^^^^^^^^^^^^^ reserved keyword
+   |
+help: consider replacing `typeof(...)` with an actual type
+   |
+LL |     y: (&'static str,),
+   |         ~~~~~~~~~~~~
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0516`.

src/test/ui/mir/issue-102389.rs

@@ -0,0 +1,8 @@
+enum Enum { A, B, C }
+
+fn func(inbounds: &Enum, array: &[i16; 3]) -> i16 {
+    array[*inbounds as usize]
+    //~^ ERROR [E0507]
+}
+
+fn main() {}

src/test/ui/mir/issue-102389.stderr

@@ -0,0 +1,9 @@
+error[E0507]: cannot move out of `*inbounds` which is behind a shared reference
+  --> $DIR/issue-102389.rs:4:11
+   |
+LL |     array[*inbounds as usize]
+   |           ^^^^^^^^^ move occurs because `*inbounds` has type `Enum`, which does not implement the `Copy` trait
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0507`.

src/test/ui/native-library-link-flags/suggest-libname-only-1.rs

@@ -0,0 +1,9 @@
+// build-fail
+// compile-flags: --crate-type rlib
+// error-pattern: could not find native static library `libfoo.a`
+// error-pattern: only provide the library name `foo`, not the full filename
+
+#[link(name = "libfoo.a", kind = "static")]
+extern { }
+
+pub fn main() { }

src/test/ui/native-library-link-flags/suggest-libname-only-1.stderr

@@ -0,0 +1,6 @@
+error: could not find native static library `libfoo.a`, perhaps an -L flag is missing?
+   |
+   = help: only provide the library name `foo`, not the full filename
+
+error: aborting due to previous error
+

src/test/ui/native-library-link-flags/suggest-libname-only-2.rs

@@ -0,0 +1,9 @@
+// build-fail
+// compile-flags: --crate-type rlib
+// error-pattern: could not find native static library `bar.lib`
+// error-pattern: only provide the library name `bar`, not the full filename
+
+#[link(name = "bar.lib", kind = "static")]
+extern { }
+
+pub fn main() { }

src/test/ui/native-library-link-flags/suggest-libname-only-2.stderr

@@ -0,0 +1,6 @@
+error: could not find native static library `bar.lib`, perhaps an -L flag is missing?
+   |
+   = help: only provide the library name `bar`, not the full filename
+
+error: aborting due to previous error
+

src/test/ui/type-alias-impl-trait/closure_parent_substs.rs

@@ -0,0 +1,65 @@
+// When WF checking the hidden type in the ParamEnv of the opaque type,
+// one complication arises when the hidden type is a closure/generator:
+// the "parent_substs" of the type may reference lifetime parameters
+// not present in the opaque type.
+// These region parameters are not really useful in this check.
+// So here we ignore them and replace them with fresh region variables.
+
+// check-pass
+
+#![feature(type_alias_impl_trait)]
+#![allow(dead_code)]
+
+// Basic test
+mod test1 {
+    // Hidden type = Closure['_#0r]
+    type Opaque = impl Sized;
+
+    fn define<'a: 'a>() -> Opaque {
+        || {}
+    }
+}
+
+// the region vars cannot both be equal to `'static` or `'empty`
+mod test2 {
+    trait Trait {}
+
+    // Hidden type = Closure['a, '_#0r, '_#1r]
+    // Constraints = [('_#0r: 'a), ('a: '_#1r)]
+    type Opaque<'a>
+    where
+        &'a (): Trait,
+    = impl Sized + 'a;
+
+    fn define<'a, 'x, 'y>() -> Opaque<'a>
+    where
+        &'a (): Trait,
+        'x: 'a,
+        'a: 'y,
+    {
+        || {}
+    }
+}
+
+// the region var cannot be equal to `'a` or `'b`
+mod test3 {
+    trait Trait {}
+
+    // Hidden type = Closure['a, 'b, '_#0r]
+    // Constraints = [('_#0r: 'a), ('_#0r: 'b)]
+    type Opaque<'a, 'b>
+    where
+        (&'a (), &'b ()): Trait,
+    = impl Sized + 'a + 'b;
+
+    fn define<'a, 'b, 'x>() -> Opaque<'a, 'b>
+    where
+        (&'a (), &'b ()): Trait,
+        'x: 'a,
+        'x: 'b,
+    {
+        || {}
+    }
+}
+
+fn main() {}

src/test/ui/type-alias-impl-trait/closure_wf_outlives.rs

@@ -0,0 +1,65 @@
+// If the hidden type is a closure, we require the "outlives" bounds that appear on the
+// defining site to also appear on the opaque type.
+//
+// It's not clear if this is the desired behavior but at least
+// it's consistent and has no back-compat risk.
+
+// check-fail
+
+#![feature(type_alias_impl_trait)]
+#![allow(dead_code)]
+
+// requires `'a: 'b` bound
+mod test1 {
+    type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+    //~^ ERROR lifetime bound not satisfied
+
+    fn define<'a, 'b>() -> Opaque<'a, 'b>
+    where
+        'a: 'b,
+    {
+        || {}
+    }
+}
+
+// Same as the above but through indirection `'x`
+mod test2 {
+    type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+    //~^ ERROR cannot infer an appropriate lifetime
+
+    fn define<'a, 'b, 'x>() -> Opaque<'a, 'b>
+    where
+        'a: 'x,
+        'x: 'b,
+    {
+        || {}
+    }
+}
+
+// fixed version of the above
+mod test2_fixed {
+    type Opaque<'a: 'b, 'b> = impl Sized + 'a + 'b;
+
+    fn define<'a, 'b, 'x>() -> Opaque<'a, 'b>
+    where
+        'a: 'x,
+        'x: 'b,
+    {
+        || {}
+    }
+}
+
+// requires `T: 'static`
+mod test3 {
+    type Opaque<T> = impl Sized;
+    //~^ ERROR the parameter type `T` may not live long enough
+
+    fn define<T>() -> Opaque<T>
+    where
+        T: 'static,
+    {
+        || {}
+    }
+}
+
+fn main() {}

src/test/ui/type-alias-impl-trait/closure_wf_outlives.stderr

@@ -0,0 +1,64 @@
+error[E0478]: lifetime bound not satisfied
+  --> $DIR/closure_wf_outlives.rs:14:27
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                           ^^^^^^^^^^^^^^^^^^^^
+   |
+note: lifetime parameter instantiated with the lifetime `'a` as defined here
+  --> $DIR/closure_wf_outlives.rs:14:17
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                 ^^
+note: but lifetime parameter must outlive the lifetime `'b` as defined here
+  --> $DIR/closure_wf_outlives.rs:14:21
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                     ^^
+
+error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
+  --> $DIR/closure_wf_outlives.rs:27:27
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                           ^^^^^^^^^^^^^^^^^^^^
+   |
+note: first, the lifetime cannot outlive the lifetime `'a` as defined here...
+  --> $DIR/closure_wf_outlives.rs:27:17
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                 ^^
+note: ...so that the declared lifetime parameter bounds are satisfied
+  --> $DIR/closure_wf_outlives.rs:27:27
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                           ^^^^^^^^^^^^^^^^^^^^
+note: but, the lifetime must be valid for the lifetime `'b` as defined here...
+  --> $DIR/closure_wf_outlives.rs:27:21
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                     ^^
+note: ...so that the declared lifetime parameter bounds are satisfied
+  --> $DIR/closure_wf_outlives.rs:27:27
+   |
+LL |     type Opaque<'a, 'b> = impl Sized + 'a + 'b;
+   |                           ^^^^^^^^^^^^^^^^^^^^
+
+error[E0310]: the parameter type `T` may not live long enough
+  --> $DIR/closure_wf_outlives.rs:54:22
+   |
+LL |     type Opaque<T> = impl Sized;
+   |                      ^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds...
+   |
+note: ...that is required by this bound
+  --> $DIR/closure_wf_outlives.rs:59:12
+   |
+LL |         T: 'static,
+   |            ^^^^^^^
+help: consider adding an explicit lifetime bound...
+   |
+LL |     type Opaque<T: 'static> = impl Sized;
+   |                  +++++++++
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0310, E0478, E0495.
+For more information about an error, try `rustc --explain E0310`.

triagebot.toml

@@ -179,6 +179,8 @@ exclude_labels = [
 [autolabel."A-bootstrap"]
 trigger_files = [
     "x.py",
+    "x",
+    "x.ps1",
     "src/bootstrap",
     "src/tools/rust-installer",
 ]