diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs index 58725a08c7c5f..395540764ea05 100644 --- a/compiler/rustc_ast/src/ast.rs +++ b/compiler/rustc_ast/src/ast.rs @@ -2092,6 +2092,10 @@ pub enum TyKind { Never, /// A tuple (`(A, B, C, D,...)`). Tup(ThinVec>), + /// An anonymous struct type i.e. `struct { foo: Type }` + AnonStruct(ThinVec), + /// An anonymous union type i.e. `union { bar: Type }` + AnonUnion(ThinVec), /// A path (`module::module::...::Type`), optionally /// "qualified", e.g., ` as SomeTrait>::SomeType`. /// diff --git a/compiler/rustc_ast/src/mut_visit.rs b/compiler/rustc_ast/src/mut_visit.rs index 48e9b180b74fc..e3504a5638e47 100644 --- a/compiler/rustc_ast/src/mut_visit.rs +++ b/compiler/rustc_ast/src/mut_visit.rs @@ -510,6 +510,9 @@ pub fn noop_visit_ty(ty: &mut P, vis: &mut T) { visit_vec(bounds, |bound| vis.visit_param_bound(bound)); } TyKind::MacCall(mac) => vis.visit_mac_call(mac), + TyKind::AnonStruct(fields) | TyKind::AnonUnion(fields) => { + fields.flat_map_in_place(|field| vis.flat_map_field_def(field)); + } } vis.visit_span(span); visit_lazy_tts(tokens, vis); diff --git a/compiler/rustc_ast/src/token.rs b/compiler/rustc_ast/src/token.rs index f4ad0efa42344..300b1486f9ba0 100644 --- a/compiler/rustc_ast/src/token.rs +++ b/compiler/rustc_ast/src/token.rs @@ -486,6 +486,8 @@ impl Token { Lt | BinOp(Shl) | // associated path ModSep => true, // global path Interpolated(ref nt) => matches!(**nt, NtTy(..) | NtPath(..)), + // For anonymous structs or unions, which only appear in specific positions + // (type of struct fields or union fields), we don't consider them as regular types _ => false, } } diff --git a/compiler/rustc_ast/src/visit.rs b/compiler/rustc_ast/src/visit.rs index 6d474de2d15f1..ddbbf5a10bcdd 100644 --- a/compiler/rustc_ast/src/visit.rs +++ b/compiler/rustc_ast/src/visit.rs @@ -438,6 +438,9 @@ pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) { TyKind::Infer | TyKind::ImplicitSelf | TyKind::Err => {} TyKind::MacCall(mac) => visitor.visit_mac_call(mac), TyKind::Never | TyKind::CVarArgs => {} + TyKind::AnonStruct(ref fields, ..) | TyKind::AnonUnion(ref fields, ..) => { + walk_list!(visitor, visit_field_def, fields) + } } } diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs index 4a47de1280c63..1827e42368f92 100644 --- a/compiler/rustc_ast_lowering/src/lib.rs +++ b/compiler/rustc_ast_lowering/src/lib.rs @@ -1293,6 +1293,18 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { TyKind::Err => { hir::TyKind::Err(self.tcx.sess.delay_span_bug(t.span, "TyKind::Err lowered")) } + // FIXME(unnamed_fields): IMPLEMENTATION IN PROGRESS + #[allow(rustc::untranslatable_diagnostic)] + #[allow(rustc::diagnostic_outside_of_impl)] + TyKind::AnonStruct(ref _fields) => hir::TyKind::Err( + self.tcx.sess.span_err(t.span, "anonymous structs are unimplemented"), + ), + // FIXME(unnamed_fields): IMPLEMENTATION IN PROGRESS + #[allow(rustc::untranslatable_diagnostic)] + #[allow(rustc::diagnostic_outside_of_impl)] + TyKind::AnonUnion(ref _fields) => hir::TyKind::Err( + self.tcx.sess.span_err(t.span, "anonymous unions are unimplemented"), + ), TyKind::Slice(ty) => hir::TyKind::Slice(self.lower_ty(ty, itctx)), TyKind::Ptr(mt) => hir::TyKind::Ptr(self.lower_mt(mt, itctx)), TyKind::Ref(region, mt) => { diff --git a/compiler/rustc_ast_passes/messages.ftl b/compiler/rustc_ast_passes/messages.ftl index f323bb4c254e0..ee5007027de96 100644 --- a/compiler/rustc_ast_passes/messages.ftl +++ b/compiler/rustc_ast_passes/messages.ftl @@ -1,3 +1,7 @@ +ast_passes_anon_struct_or_union_not_allowed = + anonymous {$struct_or_union}s are not allowed outside of unnamed struct or union fields + .label = anonymous {$struct_or_union} declared here + ast_passes_assoc_const_without_body = associated constant in `impl` without body .suggestion = provide a definition for the constant @@ -162,6 +166,14 @@ ast_passes_inherent_cannot_be = inherent impls cannot be {$annotation} ast_passes_invalid_label = invalid label name `{$name}` +ast_passes_invalid_unnamed_field = + unnamed fields are not allowed outside of structs or unions + .label = unnamed field declared here + +ast_passes_invalid_unnamed_field_ty = + unnamed fields can only have struct or union types + .label = not a struct or union + ast_passes_item_underscore = `{$kind}` items in this context need a name .label = `_` is not a valid name for this `{$kind}` item diff --git a/compiler/rustc_ast_passes/src/ast_validation.rs b/compiler/rustc_ast_passes/src/ast_validation.rs index bd3e676daa4c7..ad367d05f0478 100644 --- a/compiler/rustc_ast_passes/src/ast_validation.rs +++ b/compiler/rustc_ast_passes/src/ast_validation.rs @@ -223,10 +223,27 @@ impl<'a> AstValidator<'a> { } } } + TyKind::AnonStruct(ref fields, ..) | TyKind::AnonUnion(ref fields, ..) => { + walk_list!(self, visit_field_def, fields) + } _ => visit::walk_ty(self, t), } } + fn visit_struct_field_def(&mut self, field: &'a FieldDef) { + if let Some(ident) = field.ident && + ident.name == kw::Underscore { + self.check_unnamed_field_ty(&field.ty, ident.span); + self.visit_vis(&field.vis); + self.visit_ident(ident); + self.visit_ty_common(&field.ty); + self.walk_ty(&field.ty); + walk_list!(self, visit_attribute, &field.attrs); + } else { + self.visit_field_def(field); + } + } + fn err_handler(&self) -> &rustc_errors::Handler { &self.session.diagnostic() } @@ -264,6 +281,42 @@ impl<'a> AstValidator<'a> { } } + fn check_unnamed_field_ty(&self, ty: &Ty, span: Span) { + if matches!( + &ty.kind, + // We already checked for `kw::Underscore` before calling this function, + // so skip the check + TyKind::AnonStruct(..) | TyKind::AnonUnion(..) + // If the anonymous field contains a Path as type, we can't determine + // if the path is a valid struct or union, so skip the check + | TyKind::Path(..) + ) { + return; + } + self.err_handler().emit_err(errors::InvalidUnnamedFieldTy { span, ty_span: ty.span }); + } + + fn deny_anon_struct_or_union(&self, ty: &Ty) { + let struct_or_union = match &ty.kind { + TyKind::AnonStruct(..) => "struct", + TyKind::AnonUnion(..) => "union", + _ => return, + }; + self.err_handler() + .emit_err(errors::AnonStructOrUnionNotAllowed { struct_or_union, span: ty.span }); + } + + fn deny_unnamed_field(&self, field: &FieldDef) { + if let Some(ident) = field.ident && + ident.name == kw::Underscore { + self.err_handler() + .emit_err(errors::InvalidUnnamedField { + span: field.span, + ident_span: ident.span + }); + } + } + fn check_trait_fn_not_const(&self, constness: Const) { if let Const::Yes(span) = constness { self.session.emit_err(errors::TraitFnConst { span }); @@ -789,6 +842,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> { fn visit_ty(&mut self, ty: &'a Ty) { self.visit_ty_common(ty); + self.deny_anon_struct_or_union(ty); self.walk_ty(ty) } @@ -803,6 +857,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> { } fn visit_field_def(&mut self, field: &'a FieldDef) { + self.deny_unnamed_field(field); visit::walk_field_def(self, field) } @@ -995,10 +1050,38 @@ impl<'a> Visitor<'a> for AstValidator<'a> { self.check_mod_file_item_asciionly(item.ident); } } - ItemKind::Union(vdata, ..) => { + ItemKind::Struct(vdata, generics) => match vdata { + // Duplicating the `Visitor` logic allows catching all cases + // of `Anonymous(Struct, Union)` outside of a field struct or union. + // + // Inside `visit_ty` the validator catches every `Anonymous(Struct, Union)` it + // encounters, and only on `ItemKind::Struct` and `ItemKind::Union` + // it uses `visit_ty_common`, which doesn't contain that specific check. + VariantData::Struct(fields, ..) => { + self.visit_vis(&item.vis); + self.visit_ident(item.ident); + self.visit_generics(generics); + walk_list!(self, visit_struct_field_def, fields); + walk_list!(self, visit_attribute, &item.attrs); + return; + } + _ => {} + }, + ItemKind::Union(vdata, generics) => { if vdata.fields().is_empty() { self.err_handler().emit_err(errors::FieldlessUnion { span: item.span }); } + match vdata { + VariantData::Struct(fields, ..) => { + self.visit_vis(&item.vis); + self.visit_ident(item.ident); + self.visit_generics(generics); + walk_list!(self, visit_struct_field_def, fields); + walk_list!(self, visit_attribute, &item.attrs); + return; + } + _ => {} + } } ItemKind::Const(box ConstItem { defaultness, expr: None, .. }) => { self.check_defaultness(item.span, *defaultness); diff --git a/compiler/rustc_ast_passes/src/errors.rs b/compiler/rustc_ast_passes/src/errors.rs index a6f217d4780fd..74ab48c06ff6d 100644 --- a/compiler/rustc_ast_passes/src/errors.rs +++ b/compiler/rustc_ast_passes/src/errors.rs @@ -727,3 +727,30 @@ pub struct ConstraintOnNegativeBound { #[primary_span] pub span: Span, } + +#[derive(Diagnostic)] +#[diag(ast_passes_invalid_unnamed_field_ty)] +pub struct InvalidUnnamedFieldTy { + #[primary_span] + pub span: Span, + #[label] + pub ty_span: Span, +} + +#[derive(Diagnostic)] +#[diag(ast_passes_invalid_unnamed_field)] +pub struct InvalidUnnamedField { + #[primary_span] + pub span: Span, + #[label] + pub ident_span: Span, +} + +#[derive(Diagnostic)] +#[diag(ast_passes_anon_struct_or_union_not_allowed)] +pub struct AnonStructOrUnionNotAllowed { + #[primary_span] + #[label] + pub span: Span, + pub struct_or_union: &'static str, +} diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs index 10c9c3ef11188..8405ae6ff8e8b 100644 --- a/compiler/rustc_ast_passes/src/feature_gate.rs +++ b/compiler/rustc_ast_passes/src/feature_gate.rs @@ -570,6 +570,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) { gate_all!(builtin_syntax, "`builtin #` syntax is unstable"); gate_all!(explicit_tail_calls, "`become` expression is experimental"); gate_all!(generic_const_items, "generic const items are experimental"); + gate_all!(unnamed_fields, "unnamed fields are not yet fully implemented"); if !visitor.features.negative_bounds { for &span in spans.get(&sym::negative_bounds).iter().copied().flatten() { diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs index 58ce73047bcec..8b7e91882fcc7 100644 --- a/compiler/rustc_ast_pretty/src/pprust/state.rs +++ b/compiler/rustc_ast_pretty/src/pprust/state.rs @@ -1064,6 +1064,14 @@ impl<'a> State<'a> { } self.pclose(); } + ast::TyKind::AnonStruct(fields) => { + self.head("struct"); + self.print_record_struct_body(&fields, ty.span); + } + ast::TyKind::AnonUnion(fields) => { + self.head("union"); + self.print_record_struct_body(&fields, ty.span); + } ast::TyKind::Paren(typ) => { self.popen(); self.print_type(typ); diff --git a/compiler/rustc_ast_pretty/src/pprust/state/item.rs b/compiler/rustc_ast_pretty/src/pprust/state/item.rs index d27a44f1206dd..3393f034bc3b5 100644 --- a/compiler/rustc_ast_pretty/src/pprust/state/item.rs +++ b/compiler/rustc_ast_pretty/src/pprust/state/item.rs @@ -443,7 +443,11 @@ impl<'a> State<'a> { } } - fn print_record_struct_body(&mut self, fields: &[ast::FieldDef], span: rustc_span::Span) { + pub(crate) fn print_record_struct_body( + &mut self, + fields: &[ast::FieldDef], + span: rustc_span::Span, + ) { self.nbsp(); self.bopen(); diff --git a/compiler/rustc_feature/src/active.rs b/compiler/rustc_feature/src/active.rs index f5bc140c049f2..1941390dc4a1c 100644 --- a/compiler/rustc_feature/src/active.rs +++ b/compiler/rustc_feature/src/active.rs @@ -584,6 +584,8 @@ declare_features! ( (active, type_privacy_lints, "1.72.0", Some(48054), None), /// Enables rustc to generate code that instructs libstd to NOT ignore SIGPIPE. (active, unix_sigpipe, "1.65.0", Some(97889), None), + /// Allows unnamed fields of struct and union type + (incomplete, unnamed_fields, "CURRENT_RUSTC_VERSION", Some(49804), None), /// Allows unsized fn parameters. (active, unsized_fn_params, "1.49.0", Some(48055), None), /// Allows unsized rvalues at arguments and parameters. diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs index 24c65d061f95a..5db31c2347833 100644 --- a/compiler/rustc_parse/src/parser/item.rs +++ b/compiler/rustc_parse/src/parser/item.rs @@ -1594,7 +1594,7 @@ impl<'a> Parser<'a> { Ok((class_name, ItemKind::Union(vdata, generics))) } - fn parse_record_struct_body( + pub(crate) fn parse_record_struct_body( &mut self, adt_ty: &str, ident_span: Span, @@ -1869,7 +1869,7 @@ impl<'a> Parser<'a> { } } self.expect_field_ty_separator()?; - let ty = self.parse_ty()?; + let ty = self.parse_ty_for_field_def()?; if self.token.kind == token::Colon && self.look_ahead(1, |tok| tok.kind != token::Colon) { self.sess.emit_err(errors::SingleColonStructType { span: self.token.span }); } @@ -1894,7 +1894,9 @@ impl<'a> Parser<'a> { /// for better diagnostics and suggestions. fn parse_field_ident(&mut self, adt_ty: &str, lo: Span) -> PResult<'a, Ident> { let (ident, is_raw) = self.ident_or_err(true)?; - if !is_raw && ident.is_reserved() { + if ident.name == kw::Underscore { + self.sess.gated_spans.gate(sym::unnamed_fields, lo); + } else if !is_raw && ident.is_reserved() { let snapshot = self.create_snapshot_for_diagnostic(); let err = if self.check_fn_front_matter(false, Case::Sensitive) { let inherited_vis = Visibility { diff --git a/compiler/rustc_parse/src/parser/ty.rs b/compiler/rustc_parse/src/parser/ty.rs index 2d888efb1f384..661113666cd8e 100644 --- a/compiler/rustc_parse/src/parser/ty.rs +++ b/compiler/rustc_parse/src/parser/ty.rs @@ -136,6 +136,17 @@ impl<'a> Parser<'a> { ) } + /// Parse a type suitable for a field defintion. + /// The difference from `parse_ty` is that this version + /// allows anonymous structs and unions. + pub fn parse_ty_for_field_def(&mut self) -> PResult<'a, P> { + if self.can_begin_anon_struct_or_union() { + self.parse_anon_struct_or_union() + } else { + self.parse_ty() + } + } + /// Parse a type suitable for a function or function pointer parameter. /// The difference from `parse_ty` is that this version allows `...` /// (`CVarArgs`) at the top level of the type. @@ -336,6 +347,36 @@ impl<'a> Parser<'a> { if allow_qpath_recovery { self.maybe_recover_from_bad_qpath(ty) } else { Ok(ty) } } + /// Parse an anonymous struct or union (only for field definitions): + /// ```ignore (feature-not-ready) + /// #[repr(C)] + /// struct Foo { + /// _: struct { // anonymous struct + /// x: u32, + /// y: f64, + /// } + /// _: union { // anonymous union + /// z: u32, + /// w: f64, + /// } + /// } + /// ``` + fn parse_anon_struct_or_union(&mut self) -> PResult<'a, P> { + assert!(self.token.is_keyword(kw::Union) || self.token.is_keyword(kw::Struct)); + let is_union = self.token.is_keyword(kw::Union); + + let lo = self.token.span; + self.bump(); + + let (fields, _recovered) = + self.parse_record_struct_body(if is_union { "union" } else { "struct" }, lo, false)?; + let span = lo.to(self.prev_token.span); + self.sess.gated_spans.gate(sym::unnamed_fields, span); + // These can be rejected during AST validation in `deny_anon_struct_or_union`. + let kind = if is_union { TyKind::AnonUnion(fields) } else { TyKind::AnonStruct(fields) }; + Ok(self.mk_ty(span, kind)) + } + /// Parses either: /// - `(TYPE)`, a parenthesized type. /// - `(TYPE,)`, a tuple with a single field of type TYPE. @@ -696,6 +737,11 @@ impl<'a> Parser<'a> { Ok(bounds) } + pub(super) fn can_begin_anon_struct_or_union(&mut self) -> bool { + (self.token.is_keyword(kw::Struct) || self.token.is_keyword(kw::Union)) + && self.look_ahead(1, |t| t == &token::OpenDelim(Delimiter::Brace)) + } + /// Can the current token begin a bound? fn can_begin_bound(&mut self) -> bool { // This needs to be synchronized with `TokenKind::can_begin_bound`. diff --git a/compiler/rustc_passes/src/hir_stats.rs b/compiler/rustc_passes/src/hir_stats.rs index 5aa8aef6a859a..24087a4eabbcd 100644 --- a/compiler/rustc_passes/src/hir_stats.rs +++ b/compiler/rustc_passes/src/hir_stats.rs @@ -587,6 +587,8 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> { BareFn, Never, Tup, + AnonStruct, + AnonUnion, Path, TraitObject, ImplTrait, diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs index 8aec12f128ec6..c0eff6dfd8fec 100644 --- a/compiler/rustc_span/src/symbol.rs +++ b/compiler/rustc_span/src/symbol.rs @@ -1618,6 +1618,7 @@ symbols! { unix_sigpipe, unlikely, unmarked_api, + unnamed_fields, unpin, unreachable, unreachable_2015, diff --git a/src/tools/rustfmt/src/types.rs b/src/tools/rustfmt/src/types.rs index 18a08f17ba02f..5e8edd8f8bf4e 100644 --- a/src/tools/rustfmt/src/types.rs +++ b/src/tools/rustfmt/src/types.rs @@ -819,6 +819,8 @@ impl Rewrite for ast::Ty { ast::TyKind::Tup(ref items) => { rewrite_tuple(context, items.iter(), self.span, shape, items.len() == 1) } + ast::TyKind::AnonStruct(_) => Some(context.snippet(self.span).to_owned()), + ast::TyKind::AnonUnion(_) => Some(context.snippet(self.span).to_owned()), ast::TyKind::Path(ref q_self, ref path) => { rewrite_path(context, PathContext::Type, q_self, path, shape) } diff --git a/src/tools/rustfmt/tests/target/anonymous-types.rs b/src/tools/rustfmt/tests/target/anonymous-types.rs new file mode 100644 index 0000000000000..8e08c314ed1fb --- /dev/null +++ b/src/tools/rustfmt/tests/target/anonymous-types.rs @@ -0,0 +1,19 @@ +// Test for issue 85480 +// Pretty print anonymous struct and union types + +// pp-exact +// pretty-compare-only + +struct Foo { + _: union { + _: struct { + a: u8, + b: u16, + }, + c: u32, + }, + d: u64, + e: f32, +} + +fn main() {} diff --git a/tests/ui/feature-gates/feature-gate-unnamed_fields.rs b/tests/ui/feature-gates/feature-gate-unnamed_fields.rs new file mode 100644 index 0000000000000..4bbd0c83bfbca --- /dev/null +++ b/tests/ui/feature-gates/feature-gate-unnamed_fields.rs @@ -0,0 +1,26 @@ +struct Foo { + foo: u8, + _: union { //~ ERROR unnamed fields are not yet fully implemented [E0658] + //~^ ERROR unnamed fields are not yet fully implemented [E0658] + //~| ERROR anonymous unions are unimplemented + bar: u8, + baz: u16 + } +} + +union Bar { + foobar: u8, + _: struct { //~ ERROR unnamed fields are not yet fully implemented [E0658] + //~^ ERROR unnamed fields are not yet fully implemented [E0658] + //~| ERROR anonymous structs are unimplemented + foobaz: u8, + barbaz: u16 + } +} + +struct S; +struct Baz { + _: S //~ ERROR unnamed fields are not yet fully implemented [E0658] +} + +fn main(){} diff --git a/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr b/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr new file mode 100644 index 0000000000000..f026f2c3600b3 --- /dev/null +++ b/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr @@ -0,0 +1,84 @@ +error[E0658]: unnamed fields are not yet fully implemented + --> $DIR/feature-gate-unnamed_fields.rs:3:5 + | +LL | _: union { + | ^ + | + = note: see issue #49804 for more information + = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable + +error[E0658]: unnamed fields are not yet fully implemented + --> $DIR/feature-gate-unnamed_fields.rs:3:8 + | +LL | _: union { + | ________^ +LL | | +LL | | +LL | | bar: u8, +LL | | baz: u16 +LL | | } + | |_____^ + | + = note: see issue #49804 for more information + = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable + +error[E0658]: unnamed fields are not yet fully implemented + --> $DIR/feature-gate-unnamed_fields.rs:13:5 + | +LL | _: struct { + | ^ + | + = note: see issue #49804 for more information + = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable + +error[E0658]: unnamed fields are not yet fully implemented + --> $DIR/feature-gate-unnamed_fields.rs:13:8 + | +LL | _: struct { + | ________^ +LL | | +LL | | +LL | | foobaz: u8, +LL | | barbaz: u16 +LL | | } + | |_____^ + | + = note: see issue #49804 for more information + = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable + +error[E0658]: unnamed fields are not yet fully implemented + --> $DIR/feature-gate-unnamed_fields.rs:23:5 + | +LL | _: S + | ^ + | + = note: see issue #49804 for more information + = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable + +error: anonymous unions are unimplemented + --> $DIR/feature-gate-unnamed_fields.rs:3:8 + | +LL | _: union { + | ________^ +LL | | +LL | | +LL | | bar: u8, +LL | | baz: u16 +LL | | } + | |_____^ + +error: anonymous structs are unimplemented + --> $DIR/feature-gate-unnamed_fields.rs:13:8 + | +LL | _: struct { + | ________^ +LL | | +LL | | +LL | | foobaz: u8, +LL | | barbaz: u16 +LL | | } + | |_____^ + +error: aborting due to 7 previous errors + +For more information about this error, try `rustc --explain E0658`. diff --git a/tests/ui/parser/keyword-union-as-identifier.rs b/tests/ui/parser/keyword-union-as-identifier.rs new file mode 100644 index 0000000000000..7062557d73126 --- /dev/null +++ b/tests/ui/parser/keyword-union-as-identifier.rs @@ -0,0 +1,72 @@ +// check-pass + +#![allow(non_camel_case_types)] +#![allow(non_upper_case_globals)] + +mod union { + type union = i32; + + pub struct Bar { + pub union: union, + } + + pub fn union() -> Bar { + Bar { + union: 5 + } + } +} + +mod struct_union { + pub struct union { + pub union: u32 + } + static union: union = union { union: 0 }; + + impl union { + pub fn union<'union>() -> &'union union { + &union + } + } + impl union {} + trait Foo {} + impl Foo for union {} + trait Bar { + fn bar() {} + } + impl Bar for union {} +} + +mod union_union { + pub union union { + pub union: u32 + } + const union: union = union { union: 0 }; + impl union { + pub fn union() -> union { + union + } + } +} + +mod trait_union { + pub trait union { + fn union() {} + } + impl union for () {} +} + +macro_rules! ty { + ($ty:ty { $($field:ident:$field_ty:ty)* }) => {}; +} + +fn main() { + let union = union::union(); + let _ = union.union; + let _ = struct_union::union::union().union; + let union = union_union::union::union(); + let _ = unsafe { union.union }; + <() as trait_union::union>::union(); + ty!(union {}); + ty!(union { union: union }); +} diff --git a/tests/ui/union/unnamed-fields/restrict_anonymous_structs.rs b/tests/ui/union/unnamed-fields/restrict_anonymous_structs.rs new file mode 100644 index 0000000000000..192bbba5a5b3a --- /dev/null +++ b/tests/ui/union/unnamed-fields/restrict_anonymous_structs.rs @@ -0,0 +1,37 @@ +#![allow(incomplete_features)] +#![feature(unnamed_fields)] + +struct F { + field: struct { field: u8 }, //~ ERROR anonymous structs are not allowed outside of unnamed struct or union fields + //~^ ERROR anonymous structs are unimplemented + _: struct { field: u8 }, + //~^ ERROR anonymous structs are unimplemented +} + +struct G { + _: (u8, u8), //~ ERROR unnamed fields can only have struct or union types +} + +union H { + field: struct { field: u8 }, //~ ERROR anonymous structs are not allowed outside of unnamed struct or union fields + //~^ ERROR anonymous structs are unimplemented + _: struct { field: u8 }, + //~^ ERROR anonymous structs are unimplemented +} + +union I { + _: (u8, u8), //~ ERROR unnamed fields can only have struct or union types +} + +enum K { + M { + _ : struct { field: u8 }, //~ ERROR anonymous structs are not allowed outside of unnamed struct or union fields + //~^ ERROR unnamed fields are not allowed outside of structs or unions + //~| ERROR anonymous structs are unimplemented + }, + N { + _ : u8, //~ ERROR unnamed fields are not allowed outside of structs or unions + } +} + +fn main() {} diff --git a/tests/ui/union/unnamed-fields/restrict_anonymous_structs.stderr b/tests/ui/union/unnamed-fields/restrict_anonymous_structs.stderr new file mode 100644 index 0000000000000..fd731766c01ff --- /dev/null +++ b/tests/ui/union/unnamed-fields/restrict_anonymous_structs.stderr @@ -0,0 +1,78 @@ +error: anonymous structs are not allowed outside of unnamed struct or union fields + --> $DIR/restrict_anonymous_structs.rs:5:12 + | +LL | field: struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ anonymous struct declared here + +error: unnamed fields can only have struct or union types + --> $DIR/restrict_anonymous_structs.rs:12:5 + | +LL | _: (u8, u8), + | ^ -------- not a struct or union + +error: anonymous structs are not allowed outside of unnamed struct or union fields + --> $DIR/restrict_anonymous_structs.rs:16:12 + | +LL | field: struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ anonymous struct declared here + +error: unnamed fields can only have struct or union types + --> $DIR/restrict_anonymous_structs.rs:23:5 + | +LL | _: (u8, u8), + | ^ -------- not a struct or union + +error: unnamed fields are not allowed outside of structs or unions + --> $DIR/restrict_anonymous_structs.rs:28:9 + | +LL | _ : struct { field: u8 }, + | -^^^^^^^^^^^^^^^^^^^^^^^ + | | + | unnamed field declared here + +error: anonymous structs are not allowed outside of unnamed struct or union fields + --> $DIR/restrict_anonymous_structs.rs:28:13 + | +LL | _ : struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ anonymous struct declared here + +error: unnamed fields are not allowed outside of structs or unions + --> $DIR/restrict_anonymous_structs.rs:33:9 + | +LL | _ : u8, + | -^^^^^ + | | + | unnamed field declared here + +error: anonymous structs are unimplemented + --> $DIR/restrict_anonymous_structs.rs:5:12 + | +LL | field: struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ + +error: anonymous structs are unimplemented + --> $DIR/restrict_anonymous_structs.rs:7:8 + | +LL | _: struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ + +error: anonymous structs are unimplemented + --> $DIR/restrict_anonymous_structs.rs:16:12 + | +LL | field: struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ + +error: anonymous structs are unimplemented + --> $DIR/restrict_anonymous_structs.rs:18:8 + | +LL | _: struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ + +error: anonymous structs are unimplemented + --> $DIR/restrict_anonymous_structs.rs:28:13 + | +LL | _ : struct { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 12 previous errors + diff --git a/tests/ui/union/unnamed-fields/restrict_anonymous_unions.rs b/tests/ui/union/unnamed-fields/restrict_anonymous_unions.rs new file mode 100644 index 0000000000000..c69266089bba5 --- /dev/null +++ b/tests/ui/union/unnamed-fields/restrict_anonymous_unions.rs @@ -0,0 +1,37 @@ +#![allow(incomplete_features)] +#![feature(unnamed_fields)] + +struct F { + field: union { field: u8 }, //~ ERROR anonymous unions are not allowed outside of unnamed struct or union fields + //~^ ERROR anonymous unions are unimplemented + _: union { field: u8 }, + //~^ ERROR anonymous unions are unimplemented +} + +struct G { + _: (u8, u8), //~ ERROR unnamed fields can only have struct or union types +} + +union H { + field: union { field: u8 }, //~ ERROR anonymous unions are not allowed outside of unnamed struct or union fields + //~^ ERROR anonymous unions are unimplemented + _: union { field: u8 }, + //~^ ERROR anonymous unions are unimplemented +} + +union I { + _: (u8, u8), //~ ERROR unnamed fields can only have struct or union types +} + +enum K { + M { + _ : union { field: u8 }, //~ ERROR anonymous unions are not allowed outside of unnamed struct or union fields + //~^ ERROR unnamed fields are not allowed outside of structs or unions + //~| ERROR anonymous unions are unimplemented + }, + N { + _ : u8, //~ ERROR unnamed fields are not allowed outside of structs or unions + } +} + +fn main() {} diff --git a/tests/ui/union/unnamed-fields/restrict_anonymous_unions.stderr b/tests/ui/union/unnamed-fields/restrict_anonymous_unions.stderr new file mode 100644 index 0000000000000..c65cad775a90c --- /dev/null +++ b/tests/ui/union/unnamed-fields/restrict_anonymous_unions.stderr @@ -0,0 +1,78 @@ +error: anonymous unions are not allowed outside of unnamed struct or union fields + --> $DIR/restrict_anonymous_unions.rs:5:12 + | +LL | field: union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ anonymous union declared here + +error: unnamed fields can only have struct or union types + --> $DIR/restrict_anonymous_unions.rs:12:5 + | +LL | _: (u8, u8), + | ^ -------- not a struct or union + +error: anonymous unions are not allowed outside of unnamed struct or union fields + --> $DIR/restrict_anonymous_unions.rs:16:12 + | +LL | field: union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ anonymous union declared here + +error: unnamed fields can only have struct or union types + --> $DIR/restrict_anonymous_unions.rs:23:5 + | +LL | _: (u8, u8), + | ^ -------- not a struct or union + +error: unnamed fields are not allowed outside of structs or unions + --> $DIR/restrict_anonymous_unions.rs:28:9 + | +LL | _ : union { field: u8 }, + | -^^^^^^^^^^^^^^^^^^^^^^ + | | + | unnamed field declared here + +error: anonymous unions are not allowed outside of unnamed struct or union fields + --> $DIR/restrict_anonymous_unions.rs:28:13 + | +LL | _ : union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ anonymous union declared here + +error: unnamed fields are not allowed outside of structs or unions + --> $DIR/restrict_anonymous_unions.rs:33:9 + | +LL | _ : u8, + | -^^^^^ + | | + | unnamed field declared here + +error: anonymous unions are unimplemented + --> $DIR/restrict_anonymous_unions.rs:5:12 + | +LL | field: union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ + +error: anonymous unions are unimplemented + --> $DIR/restrict_anonymous_unions.rs:7:8 + | +LL | _: union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ + +error: anonymous unions are unimplemented + --> $DIR/restrict_anonymous_unions.rs:16:12 + | +LL | field: union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ + +error: anonymous unions are unimplemented + --> $DIR/restrict_anonymous_unions.rs:18:8 + | +LL | _: union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ + +error: anonymous unions are unimplemented + --> $DIR/restrict_anonymous_unions.rs:28:13 + | +LL | _ : union { field: u8 }, + | ^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 12 previous errors +