[−][src]Struct syntex_syntax2::ext::base::ExtCtxt
One of these is made during expansion and incrementally updated as we go;
when a macro expansion occurs, the resulting nodes have the backtrace() -> expn_info
of their expansion context stored into their span.
Fields
parse_sess: &'a ParseSess
ecfg: ExpansionConfig<'a>
crate_root: Option<&'static str>
resolver: &'a mut dyn Resolver
resolve_err_count: usize
current_expansion: ExpansionData
expansions: HashMap<Span, Vec<String>>
Methods
impl<'a> ExtCtxt<'a>
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pub fn new(
parse_sess: &'a ParseSess,
ecfg: ExpansionConfig<'a>,
resolver: &'a mut dyn Resolver
) -> ExtCtxt<'a>
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parse_sess: &'a ParseSess,
ecfg: ExpansionConfig<'a>,
resolver: &'a mut dyn Resolver
) -> ExtCtxt<'a>
pub fn expander<'b>(&'b mut self) -> MacroExpander<'b, 'a>
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Returns a Folder
for deeply expanding all macros in an AST node.
pub fn monotonic_expander<'b>(&'b mut self) -> MacroExpander<'b, 'a>
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Returns a Folder
that deeply expands all macros and assigns all node ids in an AST node.
Once node ids are assigned, the node may not be expanded, removed, or otherwise modified.
pub fn new_parser_from_tts(&self, tts: &[TokenTree]) -> Parser<'a>
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pub fn codemap(&self) -> &'a CodeMap
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pub fn parse_sess(&self) -> &'a ParseSess
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pub fn cfg(&self) -> &CrateConfig
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pub fn call_site(&self) -> Span
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pub fn backtrace(&self) -> SyntaxContext
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pub fn expansion_cause(&self) -> Option<Span>
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Returns span for the macro which originally caused the current expansion to happen.
Stops backtracing at include! boundary.
pub fn struct_span_warn(&self, sp: Span, msg: &str) -> DiagnosticBuilder<'a>
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pub fn struct_span_err(&self, sp: Span, msg: &str) -> DiagnosticBuilder<'a>
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pub fn struct_span_fatal(&self, sp: Span, msg: &str) -> DiagnosticBuilder<'a>
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pub fn span_fatal(&self, sp: Span, msg: &str) -> !
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Emit msg
attached to sp
, and stop compilation immediately.
span_err
should be strongly preferred where-ever possible:
this should only be used when
- continuing has a high risk of flow-on errors (e.g. errors in declaring a macro would cause all uses of that macro to complain about "undefined macro"), or
- there is literally nothing else that can be done (however, in most cases one can construct a dummy expression/item to substitute; we never hit resolve/type-checking so the dummy value doesn't have to match anything)
pub fn span_err(&self, sp: Span, msg: &str)
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Emit msg
attached to sp
, without immediately stopping
compilation.
Compilation will be stopped in the near future (at the end of the macro expansion phase).
pub fn span_warn(&self, sp: Span, msg: &str)
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pub fn span_unimpl(&self, sp: Span, msg: &str) -> !
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pub fn span_bug(&self, sp: Span, msg: &str) -> !
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pub fn trace_macros_diag(&self)
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pub fn bug(&self, msg: &str) -> !
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pub fn trace_macros(&self) -> bool
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pub fn set_trace_macros(&mut self, x: bool)
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pub fn ident_of(&self, st: &str) -> Ident
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pub fn std_path(&self, components: &[&str]) -> Vec<Ident>
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pub fn name_of(&self, st: &str) -> Name
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pub fn check_unused_macros(&self)
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Trait Implementations
impl<'a> AstBuilder for ExtCtxt<'a>
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fn path(&self, span: Span, strs: Vec<Ident>) -> Path
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fn path_ident(&self, span: Span, id: Ident) -> Path
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fn path_global(&self, span: Span, strs: Vec<Ident>) -> Path
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fn path_all(
&self,
sp: Span,
global: bool,
idents: Vec<Ident>,
lifetimes: Vec<Lifetime>,
types: Vec<P<Ty>>,
bindings: Vec<TypeBinding>
) -> Path
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&self,
sp: Span,
global: bool,
idents: Vec<Ident>,
lifetimes: Vec<Lifetime>,
types: Vec<P<Ty>>,
bindings: Vec<TypeBinding>
) -> Path
fn qpath(
&self,
self_type: P<Ty>,
trait_path: Path,
ident: SpannedIdent
) -> (QSelf, Path)
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&self,
self_type: P<Ty>,
trait_path: Path,
ident: SpannedIdent
) -> (QSelf, Path)
Constructs a qualified path.
Constructs a path like <self_type as trait_path>::ident
.
fn qpath_all(
&self,
self_type: P<Ty>,
trait_path: Path,
ident: SpannedIdent,
lifetimes: Vec<Lifetime>,
types: Vec<P<Ty>>,
bindings: Vec<TypeBinding>
) -> (QSelf, Path)
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&self,
self_type: P<Ty>,
trait_path: Path,
ident: SpannedIdent,
lifetimes: Vec<Lifetime>,
types: Vec<P<Ty>>,
bindings: Vec<TypeBinding>
) -> (QSelf, Path)
Constructs a qualified path.
Constructs a path like <self_type as trait_path>::ident<'a, T, A=Bar>
.
fn ty_mt(&self, ty: P<Ty>, mutbl: Mutability) -> MutTy
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fn ty(&self, span: Span, ty: TyKind) -> P<Ty>
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fn ty_path(&self, path: Path) -> P<Ty>
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fn ty_ident(&self, span: Span, ident: Ident) -> P<Ty>
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fn ty_rptr(
&self,
span: Span,
ty: P<Ty>,
lifetime: Option<Lifetime>,
mutbl: Mutability
) -> P<Ty>
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&self,
span: Span,
ty: P<Ty>,
lifetime: Option<Lifetime>,
mutbl: Mutability
) -> P<Ty>
fn ty_ptr(&self, span: Span, ty: P<Ty>, mutbl: Mutability) -> P<Ty>
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fn ty_option(&self, ty: P<Ty>) -> P<Ty>
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fn ty_infer(&self, span: Span) -> P<Ty>
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fn typaram(
&self,
span: Span,
id: Ident,
attrs: Vec<Attribute>,
bounds: TyParamBounds,
default: Option<P<Ty>>
) -> TyParam
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&self,
span: Span,
id: Ident,
attrs: Vec<Attribute>,
bounds: TyParamBounds,
default: Option<P<Ty>>
) -> TyParam
fn trait_ref(&self, path: Path) -> TraitRef
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fn poly_trait_ref(&self, span: Span, path: Path) -> PolyTraitRef
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fn typarambound(&self, path: Path) -> TyParamBound
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fn lifetime(&self, span: Span, ident: Ident) -> Lifetime
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fn lifetime_def(
&self,
span: Span,
ident: Ident,
attrs: Vec<Attribute>,
bounds: Vec<Lifetime>
) -> LifetimeDef
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&self,
span: Span,
ident: Ident,
attrs: Vec<Attribute>,
bounds: Vec<Lifetime>
) -> LifetimeDef
fn stmt_expr(&self, expr: P<Expr>) -> Stmt
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fn stmt_semi(&self, expr: P<Expr>) -> Stmt
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fn stmt_let(&self, sp: Span, mutbl: bool, ident: Ident, ex: P<Expr>) -> Stmt
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fn stmt_let_typed(
&self,
sp: Span,
mutbl: bool,
ident: Ident,
typ: P<Ty>,
ex: P<Expr>
) -> Stmt
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&self,
sp: Span,
mutbl: bool,
ident: Ident,
typ: P<Ty>,
ex: P<Expr>
) -> Stmt
fn stmt_let_type_only(&self, span: Span, ty: P<Ty>) -> Stmt
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fn stmt_item(&self, sp: Span, item: P<Item>) -> Stmt
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fn block_expr(&self, expr: P<Expr>) -> P<Block>
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fn block(&self, span: Span, stmts: Vec<Stmt>) -> P<Block>
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fn expr(&self, span: Span, node: ExprKind) -> P<Expr>
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fn expr_path(&self, path: Path) -> P<Expr>
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fn expr_qpath(&self, span: Span, qself: QSelf, path: Path) -> P<Expr>
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Constructs a QPath expression.
fn expr_ident(&self, span: Span, id: Ident) -> P<Expr>
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fn expr_self(&self, span: Span) -> P<Expr>
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fn expr_binary(
&self,
sp: Span,
op: BinOpKind,
lhs: P<Expr>,
rhs: P<Expr>
) -> P<Expr>
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&self,
sp: Span,
op: BinOpKind,
lhs: P<Expr>,
rhs: P<Expr>
) -> P<Expr>
fn expr_deref(&self, sp: Span, e: P<Expr>) -> P<Expr>
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fn expr_unary(&self, sp: Span, op: UnOp, e: P<Expr>) -> P<Expr>
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fn expr_field_access(&self, sp: Span, expr: P<Expr>, ident: Ident) -> P<Expr>
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fn expr_tup_field_access(&self, sp: Span, expr: P<Expr>, idx: usize) -> P<Expr>
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fn expr_addr_of(&self, sp: Span, e: P<Expr>) -> P<Expr>
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fn expr_mut_addr_of(&self, sp: Span, e: P<Expr>) -> P<Expr>
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fn expr_call(&self, span: Span, expr: P<Expr>, args: Vec<P<Expr>>) -> P<Expr>
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fn expr_call_ident(&self, span: Span, id: Ident, args: Vec<P<Expr>>) -> P<Expr>
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fn expr_call_global(
&self,
sp: Span,
fn_path: Vec<Ident>,
args: Vec<P<Expr>>
) -> P<Expr>
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&self,
sp: Span,
fn_path: Vec<Ident>,
args: Vec<P<Expr>>
) -> P<Expr>
fn expr_method_call(
&self,
span: Span,
expr: P<Expr>,
ident: Ident,
args: Vec<P<Expr>>
) -> P<Expr>
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&self,
span: Span,
expr: P<Expr>,
ident: Ident,
args: Vec<P<Expr>>
) -> P<Expr>
fn expr_block(&self, b: P<Block>) -> P<Expr>
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fn field_imm(&self, span: Span, name: Ident, e: P<Expr>) -> Field
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fn expr_struct(&self, span: Span, path: Path, fields: Vec<Field>) -> P<Expr>
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fn expr_struct_ident(
&self,
span: Span,
id: Ident,
fields: Vec<Field>
) -> P<Expr>
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&self,
span: Span,
id: Ident,
fields: Vec<Field>
) -> P<Expr>
fn expr_lit(&self, sp: Span, lit: LitKind) -> P<Expr>
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fn expr_usize(&self, span: Span, i: usize) -> P<Expr>
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fn expr_isize(&self, sp: Span, i: isize) -> P<Expr>
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fn expr_u32(&self, sp: Span, u: u32) -> P<Expr>
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fn expr_u8(&self, sp: Span, u: u8) -> P<Expr>
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fn expr_bool(&self, sp: Span, value: bool) -> P<Expr>
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fn expr_vec(&self, sp: Span, exprs: Vec<P<Expr>>) -> P<Expr>
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fn expr_vec_ng(&self, sp: Span) -> P<Expr>
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fn expr_vec_slice(&self, sp: Span, exprs: Vec<P<Expr>>) -> P<Expr>
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fn expr_str(&self, sp: Span, s: Symbol) -> P<Expr>
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fn expr_cast(&self, sp: Span, expr: P<Expr>, ty: P<Ty>) -> P<Expr>
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fn expr_some(&self, sp: Span, expr: P<Expr>) -> P<Expr>
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fn expr_none(&self, sp: Span) -> P<Expr>
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fn expr_break(&self, sp: Span) -> P<Expr>
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fn expr_tuple(&self, sp: Span, exprs: Vec<P<Expr>>) -> P<Expr>
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fn expr_fail(&self, span: Span, msg: Symbol) -> P<Expr>
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fn expr_unreachable(&self, span: Span) -> P<Expr>
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fn expr_ok(&self, sp: Span, expr: P<Expr>) -> P<Expr>
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fn expr_err(&self, sp: Span, expr: P<Expr>) -> P<Expr>
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fn expr_try(&self, sp: Span, head: P<Expr>) -> P<Expr>
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fn pat(&self, span: Span, pat: PatKind) -> P<Pat>
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fn pat_wild(&self, span: Span) -> P<Pat>
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fn pat_lit(&self, span: Span, expr: P<Expr>) -> P<Pat>
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fn pat_ident(&self, span: Span, ident: Ident) -> P<Pat>
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fn pat_ident_binding_mode(
&self,
span: Span,
ident: Ident,
bm: BindingMode
) -> P<Pat>
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&self,
span: Span,
ident: Ident,
bm: BindingMode
) -> P<Pat>
fn pat_path(&self, span: Span, path: Path) -> P<Pat>
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fn pat_tuple_struct(
&self,
span: Span,
path: Path,
subpats: Vec<P<Pat>>
) -> P<Pat>
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&self,
span: Span,
path: Path,
subpats: Vec<P<Pat>>
) -> P<Pat>
fn pat_struct(
&self,
span: Span,
path: Path,
field_pats: Vec<Spanned<FieldPat>>
) -> P<Pat>
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&self,
span: Span,
path: Path,
field_pats: Vec<Spanned<FieldPat>>
) -> P<Pat>
fn pat_tuple(&self, span: Span, pats: Vec<P<Pat>>) -> P<Pat>
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fn pat_some(&self, span: Span, pat: P<Pat>) -> P<Pat>
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fn pat_none(&self, span: Span) -> P<Pat>
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fn pat_ok(&self, span: Span, pat: P<Pat>) -> P<Pat>
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fn pat_err(&self, span: Span, pat: P<Pat>) -> P<Pat>
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fn arm(&self, _span: Span, pats: Vec<P<Pat>>, expr: P<Expr>) -> Arm
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fn arm_unreachable(&self, span: Span) -> Arm
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fn expr_match(&self, span: Span, arg: P<Expr>, arms: Vec<Arm>) -> P<Expr>
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fn expr_if(
&self,
span: Span,
cond: P<Expr>,
then: P<Expr>,
els: Option<P<Expr>>
) -> P<Expr>
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&self,
span: Span,
cond: P<Expr>,
then: P<Expr>,
els: Option<P<Expr>>
) -> P<Expr>
fn expr_loop(&self, span: Span, block: P<Block>) -> P<Expr>
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fn lambda_fn_decl(
&self,
span: Span,
fn_decl: P<FnDecl>,
body: P<Expr>,
fn_decl_span: Span
) -> P<Expr>
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&self,
span: Span,
fn_decl: P<FnDecl>,
body: P<Expr>,
fn_decl_span: Span
) -> P<Expr>
fn lambda(&self, span: Span, ids: Vec<Ident>, body: P<Expr>) -> P<Expr>
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fn lambda0(&self, span: Span, body: P<Expr>) -> P<Expr>
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fn lambda1(&self, span: Span, body: P<Expr>, ident: Ident) -> P<Expr>
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fn lambda_stmts(&self, span: Span, ids: Vec<Ident>, stmts: Vec<Stmt>) -> P<Expr>
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fn lambda_stmts_0(&self, span: Span, stmts: Vec<Stmt>) -> P<Expr>
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fn lambda_stmts_1(&self, span: Span, stmts: Vec<Stmt>, ident: Ident) -> P<Expr>
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fn arg(&self, span: Span, ident: Ident, ty: P<Ty>) -> Arg
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fn fn_decl(&self, inputs: Vec<Arg>, output: P<Ty>) -> P<FnDecl>
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fn item(
&self,
span: Span,
name: Ident,
attrs: Vec<Attribute>,
node: ItemKind
) -> P<Item>
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&self,
span: Span,
name: Ident,
attrs: Vec<Attribute>,
node: ItemKind
) -> P<Item>
fn item_fn_poly(
&self,
span: Span,
name: Ident,
inputs: Vec<Arg>,
output: P<Ty>,
generics: Generics,
body: P<Block>
) -> P<Item>
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&self,
span: Span,
name: Ident,
inputs: Vec<Arg>,
output: P<Ty>,
generics: Generics,
body: P<Block>
) -> P<Item>
fn item_fn(
&self,
span: Span,
name: Ident,
inputs: Vec<Arg>,
output: P<Ty>,
body: P<Block>
) -> P<Item>
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&self,
span: Span,
name: Ident,
inputs: Vec<Arg>,
output: P<Ty>,
body: P<Block>
) -> P<Item>
fn variant(&self, span: Span, name: Ident, tys: Vec<P<Ty>>) -> Variant
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fn item_enum_poly(
&self,
span: Span,
name: Ident,
enum_definition: EnumDef,
generics: Generics
) -> P<Item>
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&self,
span: Span,
name: Ident,
enum_definition: EnumDef,
generics: Generics
) -> P<Item>
fn item_enum(
&self,
span: Span,
name: Ident,
enum_definition: EnumDef
) -> P<Item>
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&self,
span: Span,
name: Ident,
enum_definition: EnumDef
) -> P<Item>
fn item_struct(
&self,
span: Span,
name: Ident,
struct_def: VariantData
) -> P<Item>
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&self,
span: Span,
name: Ident,
struct_def: VariantData
) -> P<Item>
fn item_struct_poly(
&self,
span: Span,
name: Ident,
struct_def: VariantData,
generics: Generics
) -> P<Item>
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&self,
span: Span,
name: Ident,
struct_def: VariantData,
generics: Generics
) -> P<Item>
fn item_mod(
&self,
span: Span,
inner_span: Span,
name: Ident,
attrs: Vec<Attribute>,
items: Vec<P<Item>>
) -> P<Item>
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&self,
span: Span,
inner_span: Span,
name: Ident,
attrs: Vec<Attribute>,
items: Vec<P<Item>>
) -> P<Item>
fn item_static(
&self,
span: Span,
name: Ident,
ty: P<Ty>,
mutbl: Mutability,
expr: P<Expr>
) -> P<Item>
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&self,
span: Span,
name: Ident,
ty: P<Ty>,
mutbl: Mutability,
expr: P<Expr>
) -> P<Item>
fn item_const(
&self,
span: Span,
name: Ident,
ty: P<Ty>,
expr: P<Expr>
) -> P<Item>
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&self,
span: Span,
name: Ident,
ty: P<Ty>,
expr: P<Expr>
) -> P<Item>
fn item_ty_poly(
&self,
span: Span,
name: Ident,
ty: P<Ty>,
generics: Generics
) -> P<Item>
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&self,
span: Span,
name: Ident,
ty: P<Ty>,
generics: Generics
) -> P<Item>
fn item_ty(&self, span: Span, name: Ident, ty: P<Ty>) -> P<Item>
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fn attribute(&self, sp: Span, mi: MetaItem) -> Attribute
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fn meta_word(&self, sp: Span, w: Name) -> MetaItem
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fn meta_list_item_word(&self, sp: Span, w: Name) -> NestedMetaItem
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fn meta_list(&self, sp: Span, name: Name, mis: Vec<NestedMetaItem>) -> MetaItem
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fn meta_name_value(&self, sp: Span, name: Name, value: LitKind) -> MetaItem
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fn item_use(&self, sp: Span, vis: Visibility, vp: P<ViewPath>) -> P<Item>
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fn item_use_simple(&self, sp: Span, vis: Visibility, path: Path) -> P<Item>
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fn item_use_simple_(
&self,
sp: Span,
vis: Visibility,
ident: Ident,
path: Path
) -> P<Item>
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&self,
sp: Span,
vis: Visibility,
ident: Ident,
path: Path
) -> P<Item>
fn item_use_list(
&self,
sp: Span,
vis: Visibility,
path: Vec<Ident>,
imports: &[Ident]
) -> P<Item>
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&self,
sp: Span,
vis: Visibility,
path: Vec<Ident>,
imports: &[Ident]
) -> P<Item>
fn item_use_glob(&self, sp: Span, vis: Visibility, path: Vec<Ident>) -> P<Item>
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impl<'a> ExtParseUtils for ExtCtxt<'a>
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Auto Trait Implementations
impl<'a> !Send for ExtCtxt<'a>
impl<'a> Unpin for ExtCtxt<'a>
impl<'a> !Sync for ExtCtxt<'a>
impl<'a> !UnwindSafe for ExtCtxt<'a>
impl<'a> !RefUnwindSafe for ExtCtxt<'a>
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,