Auto merge of #80530 - m-ou-se:rollup-zit69ko, r=m-ou-se

Rollup of 9 pull requests

Successful merges:

 - #78934 (refactor: removing library/alloc/src/vec/mod.rs ignore-tidy-filelength)
 - #79479 (Add `Iterator::intersperse`)
 - #80128 (Edit rustc_ast::ast::FieldPat docs)
 - #80424 (Don't give an error when creating a file for the first time)
 - #80458 (Some Promotion Refactoring)
 - #80488 (Do not create dangling &T in Weak<T>::drop)
 - #80491 (Miri: make size/align_of_val work for dangling raw ptrs)
 - #80495 (Rename kw::Invalid -> kw::Empty)
 - #80513 (Add regression test for #80062)

Failed merges:

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

Author: bors

Diff for: compiler/rustc_ast/src/ast.rs

@@ -630,16 +630,16 @@ impl Pat {
     }
 }
 
-/// A single field in a struct pattern
+/// A single field in a struct pattern.
 ///
-/// Patterns like the fields of Foo `{ x, ref y, ref mut z }`
-/// are treated the same as` x: x, y: ref y, z: ref mut z`,
-/// except is_shorthand is true
+/// Patterns like the fields of `Foo { x, ref y, ref mut z }`
+/// are treated the same as `x: x, y: ref y, z: ref mut z`,
+/// except when `is_shorthand` is true.
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct FieldPat {
-    /// The identifier for the field
+    /// The identifier for the field.
     pub ident: Ident,
-    /// The pattern the field is destructured to
+    /// The pattern the field is destructured to.
     pub pat: P<Pat>,
     pub is_shorthand: bool,
     pub attrs: AttrVec,

Diff for: compiler/rustc_ast_lowering/src/lib.rs

@@ -1767,7 +1767,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         }
         self.arena.alloc_from_iter(inputs.iter().map(|param| match param.pat.kind {
             PatKind::Ident(_, ident, _) => ident,
-            _ => Ident::new(kw::Invalid, param.pat.span),
+            _ => Ident::new(kw::Empty, param.pat.span),
         }))
     }
 

Diff for: compiler/rustc_ast_passes/src/ast_validation.rs

@@ -184,7 +184,7 @@ impl<'a> AstValidator<'a> {
     }
 
     fn check_lifetime(&self, ident: Ident) {
-        let valid_names = [kw::UnderscoreLifetime, kw::StaticLifetime, kw::Invalid];
+        let valid_names = [kw::UnderscoreLifetime, kw::StaticLifetime, kw::Empty];
         if !valid_names.contains(&ident.name) && ident.without_first_quote().is_reserved() {
             self.err_handler().span_err(ident.span, "lifetimes cannot use keyword names");
         }

Diff for: compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -2787,7 +2787,7 @@ impl<'a> State<'a> {
                     self.print_explicit_self(&eself);
                 } else {
                     let invalid = if let PatKind::Ident(_, ident, _) = input.pat.kind {
-                        ident.name == kw::Invalid
+                        ident.name == kw::Empty
                     } else {
                         false
                     };

Diff for: compiler/rustc_builtin_macros/src/llvm_asm.rs

@@ -95,7 +95,7 @@ fn parse_inline_asm<'a>(
         })
         .unwrap_or(tts.len());
     let mut p = cx.new_parser_from_tts(tts.trees().skip(first_colon).collect());
-    let mut asm = kw::Invalid;
+    let mut asm = kw::Empty;
     let mut asm_str_style = None;
     let mut outputs = Vec::new();
     let mut inputs = Vec::new();

Diff for: compiler/rustc_codegen_ssa/src/mir/debuginfo.rs

@@ -170,7 +170,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 // (after #67586 gets fixed).
                 None
             } else {
-                let name = kw::Invalid;
+                let name = kw::Empty;
                 let decl = &self.mir.local_decls[local];
                 let dbg_var = if full_debug_info {
                     self.adjusted_span_and_dbg_scope(decl.source_info).map(
@@ -204,7 +204,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             None
         } else {
             Some(match whole_local_var.or(fallback_var) {
-                Some(var) if var.name != kw::Invalid => var.name.to_string(),
+                Some(var) if var.name != kw::Empty => var.name.to_string(),
                 _ => format!("{:?}", local),
             })
         };

Diff for: compiler/rustc_hir/src/hir.rs

@@ -28,7 +28,7 @@ pub struct Lifetime {
     pub span: Span,
 
     /// Either "`'a`", referring to a named lifetime definition,
-    /// or "``" (i.e., `kw::Invalid`), for elision placeholders.
+    /// or "``" (i.e., `kw::Empty`), for elision placeholders.
     ///
     /// HIR lowering inserts these placeholders in type paths that
     /// refer to type definitions needing lifetime parameters,

Diff for: compiler/rustc_lint/src/builtin.rs

@@ -868,7 +868,7 @@ impl EarlyLintPass for AnonymousParameters {
         if let ast::AssocItemKind::Fn(_, ref sig, _, _) = it.kind {
             for arg in sig.decl.inputs.iter() {
                 if let ast::PatKind::Ident(_, ident, None) = arg.pat.kind {
-                    if ident.name == kw::Invalid {
+                    if ident.name == kw::Empty {
                         cx.struct_span_lint(ANONYMOUS_PARAMETERS, arg.pat.span, |lint| {
                             let ty_snip = cx.sess.source_map().span_to_snippet(arg.ty.span);
 

Diff for: compiler/rustc_lint/src/context.rs

@@ -728,7 +728,7 @@ impl<'tcx> LateContext<'tcx> {
 
     /// Check if a `DefId`'s path matches the given absolute type path usage.
     ///
-    /// Anonymous scopes such as `extern` imports are matched with `kw::Invalid`;
+    /// Anonymous scopes such as `extern` imports are matched with `kw::Empty`;
     /// inherent `impl` blocks are matched with the name of the type.
     ///
     /// Instead of using this method, it is often preferable to instead use

Diff for: compiler/rustc_metadata/src/native_libs.rs

@@ -132,7 +132,7 @@ impl ItemLikeVisitor<'tcx> for Collector<'tcx> {
 
 impl Collector<'tcx> {
     fn register_native_lib(&mut self, span: Option<Span>, lib: NativeLib) {
-        if lib.name.as_ref().map(|&s| s == kw::Invalid).unwrap_or(false) {
+        if lib.name.as_ref().map(|&s| s == kw::Empty).unwrap_or(false) {
             match span {
                 Some(span) => {
                     struct_span_err!(

Diff for: compiler/rustc_middle/src/hir/map/mod.rs

@@ -379,7 +379,7 @@ impl<'hir> Map<'hir> {
     pub fn body_param_names(&self, id: BodyId) -> impl Iterator<Item = Ident> + 'hir {
         self.body(id).params.iter().map(|arg| match arg.pat.kind {
             PatKind::Binding(_, _, ident, _) => ident,
-            _ => Ident::new(kw::Invalid, rustc_span::DUMMY_SP),
+            _ => Ident::new(kw::Empty, rustc_span::DUMMY_SP),
         })
     }
 

Diff for: compiler/rustc_middle/src/ty/print/pretty.rs

@@ -1481,7 +1481,7 @@ impl<F: fmt::Write> Printer<'tcx> for FmtPrinter<'_, 'tcx, F> {
         // FIXME(eddyb) `name` should never be empty, but it
         // currently is for `extern { ... }` "foreign modules".
         let name = disambiguated_data.data.name();
-        if name != DefPathDataName::Named(kw::Invalid) {
+        if name != DefPathDataName::Named(kw::Empty) {
             if !self.empty_path {
                 write!(self, "::")?;
             }
@@ -1608,14 +1608,14 @@ impl<F: fmt::Write> PrettyPrinter<'tcx> for FmtPrinter<'_, 'tcx, F> {
 
         match *region {
             ty::ReEarlyBound(ref data) => {
-                data.name != kw::Invalid && data.name != kw::UnderscoreLifetime
+                data.name != kw::Empty && data.name != kw::UnderscoreLifetime
             }
 
             ty::ReLateBound(_, ty::BoundRegion { kind: br })
             | ty::ReFree(ty::FreeRegion { bound_region: br, .. })
             | ty::RePlaceholder(ty::Placeholder { name: br, .. }) => {
                 if let ty::BrNamed(_, name) = br {
-                    if name != kw::Invalid && name != kw::UnderscoreLifetime {
+                    if name != kw::Empty && name != kw::UnderscoreLifetime {
                         return true;
                     }
                 }
@@ -1685,7 +1685,7 @@ impl<F: fmt::Write> FmtPrinter<'_, '_, F> {
         // `explain_region()` or `note_and_explain_region()`.
         match *region {
             ty::ReEarlyBound(ref data) => {
-                if data.name != kw::Invalid {
+                if data.name != kw::Empty {
                     p!(write("{}", data.name));
                     return Ok(self);
                 }
@@ -1694,7 +1694,7 @@ impl<F: fmt::Write> FmtPrinter<'_, '_, F> {
             | ty::ReFree(ty::FreeRegion { bound_region: br, .. })
             | ty::RePlaceholder(ty::Placeholder { name: br, .. }) => {
                 if let ty::BrNamed(_, name) = br {
-                    if name != kw::Invalid && name != kw::UnderscoreLifetime {
+                    if name != kw::Empty && name != kw::UnderscoreLifetime {
                         p!(write("{}", name));
                         return Ok(self);
                     }

Diff for: compiler/rustc_mir/src/interpret/intrinsics.rs

@@ -141,9 +141,11 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             }
 
             sym::min_align_of_val | sym::size_of_val => {
-                let place = self.deref_operand(args[0])?;
+                // Avoid `deref_operand` -- this is not a deref, the ptr does not have to be
+                // dereferencable!
+                let place = self.ref_to_mplace(self.read_immediate(args[0])?)?;
                 let (size, align) = self
-                    .size_and_align_of(place.meta, place.layout)?
+                    .size_and_align_of_mplace(place)?
                     .ok_or_else(|| err_unsup_format!("`extern type` does not have known layout"))?;
 
                 let result = match intrinsic_name {

Diff for: compiler/rustc_mir/src/interpret/validity.rs

@@ -391,7 +391,7 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
         }
         // Make sure this is dereferenceable and all.
         let size_and_align = try_validation!(
-            self.ecx.size_and_align_of(place.meta, place.layout),
+            self.ecx.size_and_align_of_mplace(place),
             self.path,
             err_ub!(InvalidMeta(msg)) => { "invalid {} metadata: {}", kind, msg },
         );