Struct AstValidator

struct AstValidator<'a> {
    sess: &'a Session,
    features: &'a Features,
    extern_mod: Option<Span>,
    outer_trait_or_trait_impl: Option<TraitOrTraitImpl>,
    has_proc_macro_decls: bool,
    outer_impl_trait: Option<Span>,
    disallow_tilde_const: Option<TildeConstReason>,
    is_impl_trait_banned: bool,
    extern_mod_safety: Option<Safety>,
    lint_buffer: &'a mut LintBuffer,
}

Fields

sess: &'a Session

features: &'a Features

extern_mod: Option<Span>

The span of the extern in an extern { ... } block, if any.

outer_trait_or_trait_impl: Option<TraitOrTraitImpl>

has_proc_macro_decls: bool

outer_impl_trait: Option<Span>

Used to ban nested impl Trait, e.g., impl Into<impl Debug>. Nested impl Trait is allowed in associated type position, e.g., impl Iterator<Item = impl Debug>.

disallow_tilde_const: Option<TildeConstReason>

is_impl_trait_banned: bool

Used to ban impl Trait in path projections like <impl Iterator>::Item or Foo::Bar<impl Trait>

extern_mod_safety: Option<Safety>

Used to ban explicit safety on foreign items when the extern block is not marked as unsafe.

lint_buffer: &'a mut LintBuffer

Implementations

impl<'a> AstValidator<'a>

fn with_in_trait_impl( &mut self, trait_: Option<(Const, ImplPolarity, &'a TraitRef)>, f: impl FnOnce(&mut Self), )

fn with_in_trait( &mut self, span: Span, constness: Option<Span>, f: impl FnOnce(&mut Self), )

fn with_in_extern_mod( &mut self, extern_mod_safety: Safety, f: impl FnOnce(&mut Self), )

fn with_banned_impl_trait(&mut self, f: impl FnOnce(&mut Self))

fn with_tilde_const( &mut self, disallowed: Option<TildeConstReason>, f: impl FnOnce(&mut Self), )

fn check_type_alias_where_clause_location( &mut self, ty_alias: &TyAlias, ) -> Result<(), WhereClauseBeforeTypeAlias>

fn with_impl_trait(&mut self, outer: Option<Span>, f: impl FnOnce(&mut Self))

fn walk_ty(&mut self, t: &'a Ty)

fn visit_struct_field_def(&mut self, field: &'a FieldDef)

fn dcx(&self) -> DiagCtxtHandle<'a>

fn visibility_not_permitted( &self, vis: &Visibility, note: VisibilityNotPermittedNote, )

fn check_decl_no_pat( decl: &FnDecl, report_err: impl FnMut(Span, Option<Ident>, bool), )

fn check_trait_fn_not_const(&self, constness: Const, parent: &TraitOrTraitImpl)

fn check_fn_decl(&self, fn_decl: &FnDecl, self_semantic: SelfSemantic)

fn check_decl_num_args(&self, fn_decl: &FnDecl)

Emits fatal error if function declaration has more than u16::MAX arguments Error is fatal to prevent errors during typechecking

fn check_decl_cvariadic_pos(&self, fn_decl: &FnDecl)

Emits an error if a function declaration has a variadic parameter in the beginning or middle of parameter list. Example: fn foo(..., x: i32) will emit an error.

fn check_decl_attrs(&self, fn_decl: &FnDecl)

fn check_decl_self_param(&self, fn_decl: &FnDecl, self_semantic: SelfSemantic)

fn check_item_safety(&self, span: Span, safety: Safety)

This ensures that items can only be unsafe (or unmarked) outside of extern blocks.

This additionally ensures that within extern blocks, items can only be safe/unsafe inside of a unsafe-adorned extern block.

fn check_bare_fn_safety(&self, span: Span, safety: Safety)

fn check_defaultness(&self, span: Span, defaultness: Defaultness)

fn ending_semi_or_hi(&self, sp: Span) -> Span

If sp ends with a semicolon, returns it as a Span Otherwise, returns sp.shrink_to_hi()

fn check_type_no_bounds(&self, bounds: &[GenericBound], ctx: &str)

fn check_foreign_ty_genericless( &self, generics: &Generics, where_clauses: &TyAliasWhereClauses, )

fn check_foreign_kind_bodyless( &self, ident: Ident, kind: &str, body: Option<Span>, )

fn check_foreign_fn_bodyless(&self, ident: Ident, body: Option<&Block>)

An fn in extern { ... } cannot have a body { ... }.

fn current_extern_span(&self) -> Span

fn check_foreign_fn_headerless(&self, _: FnHeader)

An fn in extern { ... } cannot have qualifiers, e.g. async fn.

fn check_foreign_item_ascii_only(&self, ident: Ident)

An item in extern { ... } cannot use non-ascii identifier.

fn check_c_variadic_type(&self, fk: FnKind<'a>)

Reject invalid C-variadic types.

C-variadics must be:

• Non-const
• Either foreign, or free and unsafe extern "C" semantically

fn check_item_named(&self, ident: Ident, kind: &str)

fn check_nomangle_item_asciionly(&self, ident: Ident, item_span: Span)

fn check_mod_file_item_asciionly(&self, ident: Ident)

fn deny_generic_params(&self, generics: &Generics, ident: Span)

fn deny_super_traits(&self, bounds: &GenericBounds, ident_span: Span)

fn deny_where_clause(&self, where_clause: &WhereClause, ident_span: Span)

fn deny_items(&self, trait_items: &[P<AssocItem>], ident: Span)

fn correct_generic_order_suggestion(&self, data: &AngleBracketedArgs) -> String

fn check_generic_args_before_constraints(&self, data: &AngleBracketedArgs)

Enforce generic args coming before constraints in <...> of a path segment.

fn visit_ty_common(&mut self, ty: &'a Ty)

fn maybe_lint_missing_abi(&mut self, span: Span, id: NodeId)

Trait Implementations

impl<'a> Visitor<'a> for AstValidator<'a>

fn visit_attribute(&mut self, attr: &Attribute)

fn visit_ty(&mut self, ty: &'a Ty)

fn visit_item(&mut self, item: &'a Item)

fn visit_foreign_item(&mut self, fi: &'a ForeignItem)

fn visit_generic_args(&mut self, generic_args: &'a GenericArgs)

fn visit_generics(&mut self, generics: &'a Generics)

fn visit_param_bound(&mut self, bound: &'a GenericBound, ctxt: BoundKind)

fn visit_fn(&mut self, fk: FnKind<'a>, span: Span, id: NodeId)

fn visit_assoc_item(&mut self, item: &'a AssocItem, ctxt: AssocCtxt)

type Result = ()

The result type of the visit_* methods. Can be either (), or ControlFlow<T>.

fn visit_ident(&mut self, _ident: Ident) -> Self::Result

fn visit_local(&mut self, l: &'ast Local) -> Self::Result

fn visit_block(&mut self, b: &'ast Block) -> Self::Result

fn visit_stmt(&mut self, s: &'ast Stmt) -> Self::Result

fn visit_param(&mut self, param: &'ast Param) -> Self::Result

fn visit_arm(&mut self, a: &'ast Arm) -> Self::Result

fn visit_pat(&mut self, p: &'ast Pat) -> Self::Result

fn visit_anon_const(&mut self, c: &'ast AnonConst) -> Self::Result

fn visit_expr(&mut self, ex: &'ast Expr) -> Self::Result

fn visit_method_receiver_expr(&mut self, ex: &'ast Expr) -> Self::Result

This method is a hack to workaround unstable of stmt_expr_attributes. It can be removed once that feature is stabilized.

fn visit_expr_post(&mut self, _ex: &'ast Expr) -> Self::Result

fn visit_generic_param(&mut self, param: &'ast GenericParam) -> Self::Result

fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) -> Self::Result

fn visit_where_predicate(&mut self, p: &'ast WherePredicate) -> Self::Result

fn visit_trait_ref(&mut self, t: &'ast TraitRef) -> Self::Result

fn visit_precise_capturing_arg(&mut self, arg: &'ast PreciseCapturingArg)

fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef) -> Self::Result

fn visit_variant_data(&mut self, s: &'ast VariantData) -> Self::Result

fn visit_field_def(&mut self, s: &'ast FieldDef) -> Self::Result

fn visit_enum_def(&mut self, enum_definition: &'ast EnumDef) -> Self::Result

fn visit_variant(&mut self, v: &'ast Variant) -> Self::Result

fn visit_variant_discr(&mut self, discr: &'ast AnonConst) -> Self::Result

fn visit_label(&mut self, label: &'ast Label) -> Self::Result

fn visit_lifetime( &mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt, ) -> Self::Result

fn visit_mac_call(&mut self, mac: &'ast MacCall) -> Self::Result

fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) -> Self::Result

fn visit_path(&mut self, path: &'ast Path, _id: NodeId) -> Self::Result

fn visit_use_tree( &mut self, use_tree: &'ast UseTree, id: NodeId, _nested: bool, ) -> Self::Result

fn visit_path_segment( &mut self, path_segment: &'ast PathSegment, ) -> Self::Result

fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) -> Self::Result

fn visit_assoc_item_constraint( &mut self, constraint: &'ast AssocItemConstraint, ) -> Self::Result

fn visit_vis(&mut self, vis: &'ast Visibility) -> Self::Result

fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) -> Self::Result

fn visit_fn_header(&mut self, _header: &'ast FnHeader) -> Self::Result

fn visit_expr_field(&mut self, f: &'ast ExprField) -> Self::Result

fn visit_pat_field(&mut self, fp: &'ast PatField) -> Self::Result

fn visit_crate(&mut self, krate: &'ast Crate) -> Self::Result

fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) -> Self::Result

fn visit_format_args(&mut self, fmt: &'ast FormatArgs) -> Self::Result

fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) -> Self::Result

fn visit_capture_by(&mut self, _capture_by: &'ast CaptureBy) -> Self::Result

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 112 bytes