Auto merge of #105579 - matthiaskrgr:rollup-vw5dlqc, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #101648 (Better documentation for env::home_dir()'s broken behaviour)
 - #105283 (Don't call `diagnostic_hir_wf_check` query if we have infer variables)
 - #105369 (Detect spurious ; before assoc fn body)
 - #105472 (Make encode_info_for_trait_item use queries instead of accessing the HIR)
 - #105521 (separate heading from body)
 - #105555 (llvm-wrapper: adapt for LLVM API changes)
 - #105560 (Extend rustdoc hashtag prepended line test)

Failed merges:

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

12 files changed, 150 insertions, 18 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 1a3d458c300..2865ea89273 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -223,7 +223,11 @@ fromRust(LLVMRustCodeModel Model) {
   case LLVMRustCodeModel::Large:
     return CodeModel::Large;
   case LLVMRustCodeModel::None:
+#if LLVM_VERSION_LT(16, 0)
     return None;
+#else
+    return std::nullopt;
+#endif
   default:
     report_fatal_error("Bad CodeModel.");
   }
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index 5831d4693f1..279b6991854 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -322,7 +322,13 @@ extern "C" LLVMAttributeRef LLVMRustCreateUWTableAttr(LLVMContextRef C, bool Asy
 }
 
 extern "C" LLVMAttributeRef LLVMRustCreateAllocSizeAttr(LLVMContextRef C, uint32_t ElementSizeArg) {
-  return wrap(Attribute::getWithAllocSizeArgs(*unwrap(C), ElementSizeArg, None));
+  return wrap(Attribute::getWithAllocSizeArgs(*unwrap(C), ElementSizeArg,
+#if LLVM_VERSION_LT(16, 0)
+                                              None
+#else
+                                              std::nullopt
+#endif
+                                              ));
 }
 
 #if LLVM_VERSION_GE(15, 0)
@@ -717,7 +723,11 @@ static std::optional<DIFile::ChecksumKind> fromRust(LLVMRustChecksumKind Kind) {
 #endif
   switch (Kind) {
   case LLVMRustChecksumKind::None:
+#if LLVM_VERSION_LT(16, 0)
     return None;
+#else
+    return std::nullopt;
+#endif
   case LLVMRustChecksumKind::MD5:
     return DIFile::ChecksumKind::CSK_MD5;
   case LLVMRustChecksumKind::SHA1:
diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index 8b4c4bb2675..29f9e82da75 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -1337,24 +1337,16 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         debug!("EncodeContext::encode_info_for_trait_item({:?})", def_id);
         let tcx = self.tcx;
 
-        let ast_item = tcx.hir().expect_trait_item(def_id.expect_local());
-        self.tables.impl_defaultness.set(def_id.index, ast_item.defaultness);
+        let impl_defaultness = tcx.impl_defaultness(def_id.expect_local());
+        self.tables.impl_defaultness.set(def_id.index, impl_defaultness);
         let trait_item = tcx.associated_item(def_id);
         self.tables.assoc_container.set(def_id.index, trait_item.container);
 
         match trait_item.kind {
             ty::AssocKind::Const => {}
             ty::AssocKind::Fn => {
-                let hir::TraitItemKind::Fn(m_sig, m) = &ast_item.kind else { bug!() };
-                match *m {
-                    hir::TraitFn::Required(ref names) => {
-                        record_array!(self.tables.fn_arg_names[def_id] <- *names)
-                    }
-                    hir::TraitFn::Provided(body) => {
-                        record_array!(self.tables.fn_arg_names[def_id] <- self.tcx.hir().body_param_names(body))
-                    }
-                };
-                self.tables.asyncness.set(def_id.index, m_sig.header.asyncness);
+                record_array!(self.tables.fn_arg_names[def_id] <- tcx.fn_arg_names(def_id));
+                self.tables.asyncness.set(def_id.index, tcx.asyncness(def_id));
                 self.tables.constness.set(def_id.index, hir::Constness::NotConst);
             }
             ty::AssocKind::Type => {
diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs
index 7ebcda249e2..beb9d55d454 100644
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -706,9 +706,9 @@ impl<'a> Parser<'a> {
             }
             match parse_item(self) {
                 Ok(None) => {
-                    let is_unnecessary_semicolon = !items.is_empty()
+                    let mut is_unnecessary_semicolon = !items.is_empty()
                         // When the close delim is `)` in a case like the following, `token.kind` is expected to be `token::CloseDelim(Delimiter::Parenthesis)`,
-                        // but the actual `token.kind` is `token::CloseDelim(Delimiter::Bracket)`.
+                        // but the actual `token.kind` is `token::CloseDelim(Delimiter::Brace)`.
                         // This is because the `token.kind` of the close delim is treated as the same as
                         // that of the open delim in `TokenTreesReader::parse_token_tree`, even if the delimiters of them are different.
                         // Therefore, `token.kind` should not be compared here.
@@ -727,7 +727,13 @@ impl<'a> Parser<'a> {
                             .span_to_snippet(self.prev_token.span)
                             .map_or(false, |snippet| snippet == "}")
                         && self.token.kind == token::Semi;
-                    let semicolon_span = self.token.span;
+                    let mut semicolon_span = self.token.span;
+                    if !is_unnecessary_semicolon {
+                        // #105369, Detect spurious `;` before assoc fn body
+                        is_unnecessary_semicolon = self.token == token::OpenDelim(Delimiter::Brace)
+                            && self.prev_token.kind == token::Semi;
+                        semicolon_span = self.prev_token.span;
+                    }
                     // We have to bail or we'll potentially never make progress.
                     let non_item_span = self.token.span;
                     let is_let = self.token.is_keyword(kw::Let);
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index d0fe598ce08..85d416c43f9 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -1710,7 +1710,8 @@ impl fmt::Display for Ident {
     }
 }
 
-/// This is the most general way to print identifiers.
+/// The most general type to print identifiers.
+///
 /// AST pretty-printer is used as a fallback for turning AST structures into token streams for
 /// proc macros. Additionally, proc macros may stringify their input and expect it survive the
 /// stringification (especially true for proc macro derives written between Rust 1.15 and 1.30).
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
index dda7b2b2fa5..82449a36b1d 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
@@ -597,6 +597,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 // can get a better error message by performing HIR-based well-formedness checking.
                 if let ObligationCauseCode::WellFormed(Some(wf_loc)) =
                     root_obligation.cause.code().peel_derives()
+                    && !obligation.predicate.has_non_region_infer()
                 {
                     if let Some(cause) = self
                         .tcx
diff --git a/library/std/src/env.rs b/library/std/src/env.rs
index 6eb7cbea626..183f9ab3b08 100644
--- a/library/std/src/env.rs
+++ b/library/std/src/env.rs
@@ -570,6 +570,13 @@ impl Error for JoinPathsError {
 ///
 /// [msdn]: https://docs.microsoft.com/en-us/windows/win32/api/userenv/nf-userenv-getuserprofiledirectorya
 ///
+/// # Deprecation
+///
+/// This function is deprecated because the behaviour on Windows is not correct.
+/// The 'HOME' environment variable is not standard on Windows, and may not produce
+/// desired results; for instance, under Cygwin or Mingw it will return `/home/you`
+/// when it should return `C:\Users\you`.
+///
 /// # Examples
 ///
 /// ```
@@ -582,7 +589,7 @@ impl Error for JoinPathsError {
 /// ```
 #[deprecated(
     since = "1.29.0",
-    note = "This function's behavior is unexpected and probably not what you want. \
+    note = "This function's behavior may be unexpected on Windows. \
             Consider using a crate from crates.io instead."
 )]
 #[must_use]
diff --git a/src/librustdoc/html/markdown/tests.rs b/src/librustdoc/html/markdown/tests.rs
index 68b31a6ee08..5878c58264e 100644
--- a/src/librustdoc/html/markdown/tests.rs
+++ b/src/librustdoc/html/markdown/tests.rs
@@ -345,4 +345,12 @@ fn test_ascii_with_prepending_hashtag() {
 #..#.####.####.####..##..
 </code></pre></div>",
     );
+    t(
+        r#"```markdown
+# hello
+```"#,
+        "<div class=\"example-wrap\"><pre class=\"language-markdown\"><code>\
+# hello
+</code></pre></div>",
+    );
 }
diff --git a/src/test/ui/suggestions/issue-105226.rs b/src/test/ui/suggestions/issue-105226.rs
new file mode 100644
index 00000000000..f123dbf4cae
--- /dev/null
+++ b/src/test/ui/suggestions/issue-105226.rs
@@ -0,0 +1,22 @@
+use std::fmt;
+
+struct S {
+}
+
+impl S {
+    fn hello<P>(&self, val: &P) where P: fmt::Display; {
+        //~^ ERROR non-item in item list
+        //~| ERROR associated function in `impl` without body
+        println!("val: {}", val);
+    }
+}
+
+impl S {
+    fn hello_empty<P>(&self, val: &P) where P: fmt::Display;
+    //~^ ERROR associated function in `impl` without body
+}
+
+fn main() {
+    let s = S{};
+    s.hello(&32);
+}
diff --git a/src/test/ui/suggestions/issue-105226.stderr b/src/test/ui/suggestions/issue-105226.stderr
new file mode 100644
index 00000000000..f16a8090103
--- /dev/null
+++ b/src/test/ui/suggestions/issue-105226.stderr
@@ -0,0 +1,31 @@
+error: non-item in item list
+  --> $DIR/issue-105226.rs:7:56
+   |
+LL | impl S {
+   |        - item list starts here
+LL |     fn hello<P>(&self, val: &P) where P: fmt::Display; {
+   |                                                      - ^ non-item starts here
+   |                                                      |
+   |                                                      help: consider removing this semicolon
+...
+LL | }
+   | - item list ends here
+
+error: associated function in `impl` without body
+  --> $DIR/issue-105226.rs:7:5
+   |
+LL |     fn hello<P>(&self, val: &P) where P: fmt::Display; {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
+   |                                                      |
+   |                                                      help: provide a definition for the function: `{ <body> }`
+
+error: associated function in `impl` without body
+  --> $DIR/issue-105226.rs:15:5
+   |
+LL |     fn hello_empty<P>(&self, val: &P) where P: fmt::Display;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
+   |                                                            |
+   |                                                            help: provide a definition for the function: `{ <body> }`
+
+error: aborting due to 3 previous errors
+
diff --git a/src/test/ui/wf/hir-wf-canonicalized.rs b/src/test/ui/wf/hir-wf-canonicalized.rs
new file mode 100644
index 00000000000..bdb84409d00
--- /dev/null
+++ b/src/test/ui/wf/hir-wf-canonicalized.rs
@@ -0,0 +1,18 @@
+// incremental
+
+trait Foo {
+    type V;
+}
+
+trait Callback<T: Foo>: Fn(&Bar<'_, T>, &T::V) {}
+
+struct Bar<'a, T> {
+    callback: Box<dyn Callback<dyn Callback<Bar<'a, T>>>>,
+    //~^ ERROR the trait bound `Bar<'a, T>: Foo` is not satisfied
+    //~| ERROR the trait bound `(dyn Callback<Bar<'a, T>, for<'b, 'c, 'd> Output = ()> + 'static): Foo` is not satisfied
+    //~| ERROR the size for values of type `(dyn Callback<Bar<'a, T>, for<'b, 'c, 'd> Output = ()> + 'static)` cannot be known at compilation time
+}
+
+impl<T: Foo> Bar<'_, Bar<'_, T>> {}
+
+fn main() {}
diff --git a/src/test/ui/wf/hir-wf-canonicalized.stderr b/src/test/ui/wf/hir-wf-canonicalized.stderr
new file mode 100644
index 00000000000..9fd0f9c81eb
--- /dev/null
+++ b/src/test/ui/wf/hir-wf-canonicalized.stderr
@@ -0,0 +1,32 @@
+error[E0277]: the trait bound `Bar<'a, T>: Foo` is not satisfied
+  --> $DIR/hir-wf-canonicalized.rs:10:15
+   |
+LL |     callback: Box<dyn Callback<dyn Callback<Bar<'a, T>>>>,
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Foo` is not implemented for `Bar<'a, T>`
+
+error[E0277]: the trait bound `(dyn Callback<Bar<'a, T>, for<'b, 'c, 'd> Output = ()> + 'static): Foo` is not satisfied
+  --> $DIR/hir-wf-canonicalized.rs:10:15
+   |
+LL |     callback: Box<dyn Callback<dyn Callback<Bar<'a, T>>>>,
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Foo` is not implemented for `(dyn Callback<Bar<'a, T>, for<'b, 'c, 'd> Output = ()> + 'static)`
+
+error[E0277]: the size for values of type `(dyn Callback<Bar<'a, T>, for<'b, 'c, 'd> Output = ()> + 'static)` cannot be known at compilation time
+  --> $DIR/hir-wf-canonicalized.rs:10:15
+   |
+LL |     callback: Box<dyn Callback<dyn Callback<Bar<'a, T>>>>,
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `(dyn Callback<Bar<'a, T>, for<'b, 'c, 'd> Output = ()> + 'static)`
+note: required by a bound in `Bar`
+  --> $DIR/hir-wf-canonicalized.rs:9:16
+   |
+LL | struct Bar<'a, T> {
+   |                ^ required by this bound in `Bar`
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL | struct Bar<'a, T: ?Sized> {
+   |                 ++++++++
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0277`.