Struct swc_ecma_utils::function::FnEnvHoister

pub struct FnEnvHoister { /* private fields */ }

Don’t use it aginst function, it will stop if come across any function use it against function body

Implementations

impl FnEnvHoister

pub fn to_decl(self) -> Vec<VarDeclarator>

pub fn to_stmt(self) -> Option<Stmt>

pub fn to_stmt_in_subclass(self) -> (Option<Stmt>, Option<Ident>)

Trait Implementations

impl Default for FnEnvHoister

fn default() -> FnEnvHoister

Returns the “default value” for a type.

impl Take for FnEnvHoister

fn dummy() -> Self

Create a dummy value of this type.

fn take(&mut self) -> Self

fn map_with_mut<F>(&mut self, op: F) where
    F: FnOnce(Self) -> Self, 

Mutate self using op, which accepts owned data.

impl VisitMut for FnEnvHoister

fn visit_mut_member_expr(&mut self, m: &mut MemberExpr)

Don’t recurse into prop of member expression unless computed

fn visit_mut_super_prop_expr(&mut self, m: &mut SuperPropExpr)

Don’t recurse into prop of super expression unless computed

fn visit_mut_class(&mut self, _: &mut Class)

Don’t recurse into constructor

fn visit_mut_function(&mut self, _: &mut Function)

Don’t recurse into fn

fn visit_mut_getter_prop(&mut self, p: &mut GetterProp)

Don’t recurse into getter/setter/method except computed key

fn visit_mut_accessibility(&mut self, _: &mut Accessibility)

fn visit_mut_true_plus_minus(&mut self, _: &mut TruePlusMinus)

fn visit_mut_ts_array_type(&mut self, _: &mut TsArrayType)

fn visit_mut_ts_call_signature_decl(&mut self, _: &mut TsCallSignatureDecl)

fn visit_mut_ts_conditional_type(&mut self, _: &mut TsConditionalType)

fn visit_mut_ts_construct_signature_decl(
    &mut self,
    _: &mut TsConstructSignatureDecl
)

fn visit_mut_ts_constructor_type(&mut self, _: &mut TsConstructorType)

fn visit_mut_ts_entity_name(&mut self, _: &mut TsEntityName)

fn visit_mut_ts_external_module_ref(&mut self, _: &mut TsExternalModuleRef)

fn visit_mut_ts_fn_or_constructor_type(&mut self, _: &mut TsFnOrConstructorType)

fn visit_mut_ts_fn_param(&mut self, _: &mut TsFnParam)

fn visit_mut_ts_fn_type(&mut self, _: &mut TsFnType)

fn visit_mut_ts_import_type(&mut self, _: &mut TsImportType)

fn visit_mut_ts_index_signature(&mut self, _: &mut TsIndexSignature)

fn visit_mut_ts_indexed_access_type(&mut self, _: &mut TsIndexedAccessType)

fn visit_mut_ts_infer_type(&mut self, _: &mut TsInferType)

fn visit_mut_ts_interface_body(&mut self, _: &mut TsInterfaceBody)

fn visit_mut_ts_interface_decl(&mut self, _: &mut TsInterfaceDecl)

fn visit_mut_ts_intersection_type(&mut self, _: &mut TsIntersectionType)

fn visit_mut_ts_keyword_type(&mut self, _: &mut TsKeywordType)

fn visit_mut_ts_keyword_type_kind(&mut self, _: &mut TsKeywordTypeKind)

fn visit_mut_ts_mapped_type(&mut self, _: &mut TsMappedType)

fn visit_mut_ts_method_signature(&mut self, _: &mut TsMethodSignature)

fn visit_mut_ts_module_ref(&mut self, _: &mut TsModuleRef)

fn visit_mut_ts_optional_type(&mut self, _: &mut TsOptionalType)

fn visit_mut_ts_parenthesized_type(&mut self, _: &mut TsParenthesizedType)

fn visit_mut_ts_property_signature(&mut self, _: &mut TsPropertySignature)

fn visit_mut_ts_qualified_name(&mut self, _: &mut TsQualifiedName)

fn visit_mut_ts_rest_type(&mut self, _: &mut TsRestType)

fn visit_mut_ts_this_type(&mut self, _: &mut TsThisType)

fn visit_mut_ts_this_type_or_ident(&mut self, _: &mut TsThisTypeOrIdent)

fn visit_mut_ts_tuple_type(&mut self, _: &mut TsTupleType)

fn visit_mut_ts_type(&mut self, _: &mut TsType)

fn visit_mut_ts_type_alias_decl(&mut self, _: &mut TsTypeAliasDecl)

fn visit_mut_ts_type_ann(&mut self, _: &mut TsTypeAnn)

fn visit_mut_ts_type_element(&mut self, _: &mut TsTypeElement)

fn visit_mut_ts_type_lit(&mut self, _: &mut TsTypeLit)

fn visit_mut_ts_type_operator(&mut self, _: &mut TsTypeOperator)

fn visit_mut_ts_type_operator_op(&mut self, _: &mut TsTypeOperatorOp)

fn visit_mut_ts_type_param(&mut self, _: &mut TsTypeParam)

fn visit_mut_ts_type_param_decl(&mut self, _: &mut TsTypeParamDecl)

fn visit_mut_ts_type_param_instantiation(
    &mut self,
    _: &mut TsTypeParamInstantiation
)

fn visit_mut_ts_type_predicate(&mut self, _: &mut TsTypePredicate)

fn visit_mut_ts_type_query(&mut self, _: &mut TsTypeQuery)

fn visit_mut_ts_type_query_expr(&mut self, _: &mut TsTypeQueryExpr)

fn visit_mut_ts_type_ref(&mut self, _: &mut TsTypeRef)

fn visit_mut_ts_union_or_intersection_type(
    &mut self,
    _: &mut TsUnionOrIntersectionType
)

fn visit_mut_ts_union_type(&mut self, _: &mut TsUnionType)

fn visit_mut_expr(&mut self, e: &mut Expr)

fn visit_mut_block_stmt(&mut self, b: &mut BlockStmt)

fn visit_mut_block_stmt_or_expr(&mut self, b: &mut BlockStmtOrExpr)

fn visit_mut_setter_prop(&mut self, p: &mut SetterProp)

fn visit_mut_method_prop(&mut self, p: &mut MethodProp)

fn visit_mut_array_lit(&mut self, n: &mut ArrayLit)

fn visit_mut_array_pat(&mut self, n: &mut ArrayPat)

fn visit_mut_arrow_expr(&mut self, n: &mut ArrowExpr)

fn visit_mut_assign_expr(&mut self, n: &mut AssignExpr)

fn visit_mut_assign_op(&mut self, n: &mut AssignOp)

fn visit_mut_assign_pat(&mut self, n: &mut AssignPat)

fn visit_mut_assign_pat_prop(&mut self, n: &mut AssignPatProp)

fn visit_mut_assign_prop(&mut self, n: &mut AssignProp)

fn visit_mut_await_expr(&mut self, n: &mut AwaitExpr)

fn visit_mut_big_int(&mut self, n: &mut BigInt)

fn visit_mut_big_int_value(&mut self, n: &mut BigInt)

fn visit_mut_bin_expr(&mut self, n: &mut BinExpr)

fn visit_mut_binary_op(&mut self, n: &mut BinaryOp)

fn visit_mut_binding_ident(&mut self, n: &mut BindingIdent)

fn visit_mut_bool(&mut self, n: &mut Bool)

fn visit_mut_break_stmt(&mut self, n: &mut BreakStmt)

fn visit_mut_call_expr(&mut self, n: &mut CallExpr)

fn visit_mut_callee(&mut self, n: &mut Callee)

fn visit_mut_catch_clause(&mut self, n: &mut CatchClause)

fn visit_mut_class_decl(&mut self, n: &mut ClassDecl)

fn visit_mut_class_expr(&mut self, n: &mut ClassExpr)

fn visit_mut_class_member(&mut self, n: &mut ClassMember)

fn visit_mut_class_members(&mut self, n: &mut Vec<ClassMember, Global>)

fn visit_mut_class_method(&mut self, n: &mut ClassMethod)

fn visit_mut_class_prop(&mut self, n: &mut ClassProp)

fn visit_mut_computed_prop_name(&mut self, n: &mut ComputedPropName)

fn visit_mut_cond_expr(&mut self, n: &mut CondExpr)

fn visit_mut_constructor(&mut self, n: &mut Constructor)

fn visit_mut_continue_stmt(&mut self, n: &mut ContinueStmt)

fn visit_mut_debugger_stmt(&mut self, n: &mut DebuggerStmt)

fn visit_mut_decl(&mut self, n: &mut Decl)

fn visit_mut_decorator(&mut self, n: &mut Decorator)

fn visit_mut_decorators(&mut self, n: &mut Vec<Decorator, Global>)

fn visit_mut_default_decl(&mut self, n: &mut DefaultDecl)

fn visit_mut_do_while_stmt(&mut self, n: &mut DoWhileStmt)

fn visit_mut_empty_stmt(&mut self, n: &mut EmptyStmt)

fn visit_mut_export_all(&mut self, n: &mut ExportAll)

fn visit_mut_export_decl(&mut self, n: &mut ExportDecl)

fn visit_mut_export_default_decl(&mut self, n: &mut ExportDefaultDecl)

fn visit_mut_export_default_expr(&mut self, n: &mut ExportDefaultExpr)

fn visit_mut_export_default_specifier(&mut self, n: &mut ExportDefaultSpecifier)

fn visit_mut_export_named_specifier(&mut self, n: &mut ExportNamedSpecifier)

fn visit_mut_export_namespace_specifier(
    &mut self,
    n: &mut ExportNamespaceSpecifier
)

fn visit_mut_export_specifier(&mut self, n: &mut ExportSpecifier)

fn visit_mut_export_specifiers(&mut self, n: &mut Vec<ExportSpecifier, Global>)

fn visit_mut_expr_or_spread(&mut self, n: &mut ExprOrSpread)

fn visit_mut_expr_or_spreads(&mut self, n: &mut Vec<ExprOrSpread, Global>)

fn visit_mut_expr_stmt(&mut self, n: &mut ExprStmt)

fn visit_mut_exprs(&mut self, n: &mut Vec<Box<Expr, Global>, Global>)

fn visit_mut_fn_decl(&mut self, n: &mut FnDecl)

fn visit_mut_fn_expr(&mut self, n: &mut FnExpr)

fn visit_mut_for_in_stmt(&mut self, n: &mut ForInStmt)

fn visit_mut_for_of_stmt(&mut self, n: &mut ForOfStmt)

fn visit_mut_for_stmt(&mut self, n: &mut ForStmt)

fn visit_mut_ident(&mut self, n: &mut Ident)

fn visit_mut_if_stmt(&mut self, n: &mut IfStmt)

fn visit_mut_import(&mut self, n: &mut Import)

fn visit_mut_import_decl(&mut self, n: &mut ImportDecl)

fn visit_mut_import_default_specifier(&mut self, n: &mut ImportDefaultSpecifier)

fn visit_mut_import_named_specifier(&mut self, n: &mut ImportNamedSpecifier)

fn visit_mut_import_specifier(&mut self, n: &mut ImportSpecifier)

fn visit_mut_import_specifiers(&mut self, n: &mut Vec<ImportSpecifier, Global>)

fn visit_mut_import_star_as_specifier(&mut self, n: &mut ImportStarAsSpecifier)

fn visit_mut_invalid(&mut self, n: &mut Invalid)

fn visit_mut_js_word(&mut self, n: &mut Atom<JsWordStaticSet>)

fn visit_mut_jsx_attr(&mut self, n: &mut JSXAttr)

fn visit_mut_jsx_attr_name(&mut self, n: &mut JSXAttrName)

fn visit_mut_jsx_attr_or_spread(&mut self, n: &mut JSXAttrOrSpread)

fn visit_mut_jsx_attr_or_spreads(
    &mut self,
    n: &mut Vec<JSXAttrOrSpread, Global>
)

fn visit_mut_jsx_attr_value(&mut self, n: &mut JSXAttrValue)

fn visit_mut_jsx_closing_element(&mut self, n: &mut JSXClosingElement)

fn visit_mut_jsx_closing_fragment(&mut self, n: &mut JSXClosingFragment)

fn visit_mut_jsx_element(&mut self, n: &mut JSXElement)

fn visit_mut_jsx_element_child(&mut self, n: &mut JSXElementChild)

fn visit_mut_jsx_element_children(
    &mut self,
    n: &mut Vec<JSXElementChild, Global>
)

fn visit_mut_jsx_element_name(&mut self, n: &mut JSXElementName)

fn visit_mut_jsx_empty_expr(&mut self, n: &mut JSXEmptyExpr)

fn visit_mut_jsx_expr(&mut self, n: &mut JSXExpr)

fn visit_mut_jsx_expr_container(&mut self, n: &mut JSXExprContainer)

fn visit_mut_jsx_fragment(&mut self, n: &mut JSXFragment)

fn visit_mut_jsx_member_expr(&mut self, n: &mut JSXMemberExpr)

fn visit_mut_jsx_namespaced_name(&mut self, n: &mut JSXNamespacedName)

fn visit_mut_jsx_object(&mut self, n: &mut JSXObject)

fn visit_mut_jsx_opening_element(&mut self, n: &mut JSXOpeningElement)

fn visit_mut_jsx_opening_fragment(&mut self, n: &mut JSXOpeningFragment)

fn visit_mut_jsx_spread_child(&mut self, n: &mut JSXSpreadChild)

fn visit_mut_jsx_text(&mut self, n: &mut JSXText)

fn visit_mut_key_value_pat_prop(&mut self, n: &mut KeyValuePatProp)

fn visit_mut_key_value_prop(&mut self, n: &mut KeyValueProp)

fn visit_mut_labeled_stmt(&mut self, n: &mut LabeledStmt)

fn visit_mut_lit(&mut self, n: &mut Lit)

fn visit_mut_member_prop(&mut self, n: &mut MemberProp)

fn visit_mut_meta_prop_expr(&mut self, n: &mut MetaPropExpr)

fn visit_mut_meta_prop_kind(&mut self, n: &mut MetaPropKind)

fn visit_mut_method_kind(&mut self, n: &mut MethodKind)

fn visit_mut_module(&mut self, n: &mut Module)

fn visit_mut_module_decl(&mut self, n: &mut ModuleDecl)

fn visit_mut_module_export_name(&mut self, n: &mut ModuleExportName)

fn visit_mut_module_item(&mut self, n: &mut ModuleItem)

fn visit_mut_module_items(&mut self, n: &mut Vec<ModuleItem, Global>)

fn visit_mut_named_export(&mut self, n: &mut NamedExport)

fn visit_mut_new_expr(&mut self, n: &mut NewExpr)

fn visit_mut_null(&mut self, n: &mut Null)

fn visit_mut_number(&mut self, n: &mut Number)

fn visit_mut_object_lit(&mut self, n: &mut ObjectLit)

fn visit_mut_object_pat(&mut self, n: &mut ObjectPat)

fn visit_mut_object_pat_prop(&mut self, n: &mut ObjectPatProp)

fn visit_mut_object_pat_props(&mut self, n: &mut Vec<ObjectPatProp, Global>)

fn visit_mut_opt_accessibility(&mut self, n: &mut Option<Accessibility>)

fn visit_mut_opt_block_stmt(&mut self, n: &mut Option<BlockStmt>)

fn visit_mut_opt_catch_clause(&mut self, n: &mut Option<CatchClause>)

fn visit_mut_opt_chain_expr(&mut self, n: &mut OptChainExpr)

fn visit_mut_opt_expr(&mut self, n: &mut Option<Box<Expr, Global>>)

fn visit_mut_opt_expr_or_spread(&mut self, n: &mut Option<ExprOrSpread>)

fn visit_mut_opt_expr_or_spreads(
    &mut self,
    n: &mut Option<Vec<ExprOrSpread, Global>>
)

fn visit_mut_opt_ident(&mut self, n: &mut Option<Ident>)

fn visit_mut_opt_js_word(&mut self, n: &mut Option<Atom<JsWordStaticSet>>)

fn visit_mut_opt_jsx_attr_value(&mut self, n: &mut Option<JSXAttrValue>)

fn visit_mut_opt_jsx_closing_element(
    &mut self,
    n: &mut Option<JSXClosingElement>
)

fn visit_mut_opt_module_export_name(&mut self, n: &mut Option<ModuleExportName>)

fn visit_mut_opt_object_lit(&mut self, n: &mut Option<ObjectLit>)

fn visit_mut_opt_pat(&mut self, n: &mut Option<Pat>)

fn visit_mut_opt_span(&mut self, n: &mut Option<Span>)

fn visit_mut_opt_stmt(&mut self, n: &mut Option<Box<Stmt, Global>>)

fn visit_mut_opt_str(&mut self, n: &mut Option<Str>)

fn visit_mut_opt_true_plus_minus(&mut self, n: &mut Option<TruePlusMinus>)

fn visit_mut_opt_ts_entity_name(&mut self, n: &mut Option<TsEntityName>)

fn visit_mut_opt_ts_namespace_body(&mut self, n: &mut Option<TsNamespaceBody>)

fn visit_mut_opt_ts_type(&mut self, n: &mut Option<Box<TsType, Global>>)

fn visit_mut_opt_ts_type_ann(&mut self, n: &mut Option<TsTypeAnn>)

fn visit_mut_opt_ts_type_param_decl(&mut self, n: &mut Option<TsTypeParamDecl>)

fn visit_mut_opt_ts_type_param_instantiation(
    &mut self,
    n: &mut Option<TsTypeParamInstantiation>
)

fn visit_mut_opt_var_decl_or_expr(&mut self, n: &mut Option<VarDeclOrExpr>)

fn visit_mut_opt_vec_expr_or_spreads(
    &mut self,
    n: &mut Vec<Option<ExprOrSpread>, Global>
)

fn visit_mut_opt_vec_pats(&mut self, n: &mut Vec<Option<Pat>, Global>)

fn visit_mut_param(&mut self, n: &mut Param)

fn visit_mut_param_or_ts_param_prop(&mut self, n: &mut ParamOrTsParamProp)

fn visit_mut_param_or_ts_param_props(
    &mut self,
    n: &mut Vec<ParamOrTsParamProp, Global>
)

fn visit_mut_params(&mut self, n: &mut Vec<Param, Global>)

fn visit_mut_paren_expr(&mut self, n: &mut ParenExpr)

fn visit_mut_pat(&mut self, n: &mut Pat)

fn visit_mut_pat_or_expr(&mut self, n: &mut PatOrExpr)

fn visit_mut_pats(&mut self, n: &mut Vec<Pat, Global>)

fn visit_mut_private_method(&mut self, n: &mut PrivateMethod)

fn visit_mut_private_name(&mut self, n: &mut PrivateName)

fn visit_mut_private_prop(&mut self, n: &mut PrivateProp)

fn visit_mut_program(&mut self, n: &mut Program)

fn visit_mut_prop(&mut self, n: &mut Prop)

fn visit_mut_prop_name(&mut self, n: &mut PropName)

fn visit_mut_prop_or_spread(&mut self, n: &mut PropOrSpread)

fn visit_mut_prop_or_spreads(&mut self, n: &mut Vec<PropOrSpread, Global>)

fn visit_mut_regex(&mut self, n: &mut Regex)

fn visit_mut_rest_pat(&mut self, n: &mut RestPat)

fn visit_mut_return_stmt(&mut self, n: &mut ReturnStmt)

fn visit_mut_script(&mut self, n: &mut Script)

fn visit_mut_seq_expr(&mut self, n: &mut SeqExpr)

fn visit_mut_span(&mut self, n: &mut Span)

fn visit_mut_spread_element(&mut self, n: &mut SpreadElement)

fn visit_mut_static_block(&mut self, n: &mut StaticBlock)

fn visit_mut_stmt(&mut self, n: &mut Stmt)

fn visit_mut_stmts(&mut self, n: &mut Vec<Stmt, Global>)

fn visit_mut_str(&mut self, n: &mut Str)

fn visit_mut_str_kind(&mut self, n: &mut StrKind)

fn visit_mut_super(&mut self, n: &mut Super)

fn visit_mut_super_prop(&mut self, n: &mut SuperProp)

fn visit_mut_switch_case(&mut self, n: &mut SwitchCase)

fn visit_mut_switch_cases(&mut self, n: &mut Vec<SwitchCase, Global>)

fn visit_mut_switch_stmt(&mut self, n: &mut SwitchStmt)

fn visit_mut_tagged_tpl(&mut self, n: &mut TaggedTpl)

fn visit_mut_this_expr(&mut self, n: &mut ThisExpr)

fn visit_mut_throw_stmt(&mut self, n: &mut ThrowStmt)

fn visit_mut_tpl(&mut self, n: &mut Tpl)

fn visit_mut_tpl_element(&mut self, n: &mut TplElement)

fn visit_mut_tpl_elements(&mut self, n: &mut Vec<TplElement, Global>)

fn visit_mut_try_stmt(&mut self, n: &mut TryStmt)

fn visit_mut_ts_as_expr(&mut self, n: &mut TsAsExpr)

fn visit_mut_ts_const_assertion(&mut self, n: &mut TsConstAssertion)

fn visit_mut_ts_enum_decl(&mut self, n: &mut TsEnumDecl)

fn visit_mut_ts_enum_member(&mut self, n: &mut TsEnumMember)

fn visit_mut_ts_enum_member_id(&mut self, n: &mut TsEnumMemberId)

fn visit_mut_ts_enum_members(&mut self, n: &mut Vec<TsEnumMember, Global>)

fn visit_mut_ts_export_assignment(&mut self, n: &mut TsExportAssignment)

fn visit_mut_ts_expr_with_type_args(&mut self, n: &mut TsExprWithTypeArgs)

fn visit_mut_ts_expr_with_type_args_vec(
    &mut self,
    n: &mut Vec<TsExprWithTypeArgs, Global>
)

fn visit_mut_ts_fn_params(&mut self, n: &mut Vec<TsFnParam, Global>)

fn visit_mut_ts_getter_signature(&mut self, n: &mut TsGetterSignature)

fn visit_mut_ts_import_equals_decl(&mut self, n: &mut TsImportEqualsDecl)

fn visit_mut_ts_lit(&mut self, n: &mut TsLit)

fn visit_mut_ts_lit_type(&mut self, n: &mut TsLitType)

fn visit_mut_ts_module_block(&mut self, n: &mut TsModuleBlock)

fn visit_mut_ts_module_decl(&mut self, n: &mut TsModuleDecl)

fn visit_mut_ts_module_name(&mut self, n: &mut TsModuleName)

fn visit_mut_ts_namespace_body(&mut self, n: &mut TsNamespaceBody)

fn visit_mut_ts_namespace_decl(&mut self, n: &mut TsNamespaceDecl)

fn visit_mut_ts_namespace_export_decl(&mut self, n: &mut TsNamespaceExportDecl)

fn visit_mut_ts_non_null_expr(&mut self, n: &mut TsNonNullExpr)

fn visit_mut_ts_param_prop(&mut self, n: &mut TsParamProp)

fn visit_mut_ts_param_prop_param(&mut self, n: &mut TsParamPropParam)

fn visit_mut_ts_setter_signature(&mut self, n: &mut TsSetterSignature)

fn visit_mut_ts_tpl_lit_type(&mut self, n: &mut TsTplLitType)

fn visit_mut_ts_tuple_element(&mut self, n: &mut TsTupleElement)

fn visit_mut_ts_tuple_elements(&mut self, n: &mut Vec<TsTupleElement, Global>)

fn visit_mut_ts_type_assertion(&mut self, n: &mut TsTypeAssertion)

fn visit_mut_ts_type_elements(&mut self, n: &mut Vec<TsTypeElement, Global>)

fn visit_mut_ts_type_params(&mut self, n: &mut Vec<TsTypeParam, Global>)

fn visit_mut_ts_types(&mut self, n: &mut Vec<Box<TsType, Global>, Global>)

fn visit_mut_unary_expr(&mut self, n: &mut UnaryExpr)

fn visit_mut_unary_op(&mut self, n: &mut UnaryOp)

fn visit_mut_update_expr(&mut self, n: &mut UpdateExpr)

fn visit_mut_update_op(&mut self, n: &mut UpdateOp)

fn visit_mut_var_decl(&mut self, n: &mut VarDecl)

fn visit_mut_var_decl_kind(&mut self, n: &mut VarDeclKind)

fn visit_mut_var_decl_or_expr(&mut self, n: &mut VarDeclOrExpr)

fn visit_mut_var_decl_or_pat(&mut self, n: &mut VarDeclOrPat)

fn visit_mut_var_declarator(&mut self, n: &mut VarDeclarator)

fn visit_mut_var_declarators(&mut self, n: &mut Vec<VarDeclarator, Global>)

fn visit_mut_while_stmt(&mut self, n: &mut WhileStmt)

fn visit_mut_with_stmt(&mut self, n: &mut WithStmt)

fn visit_mut_yield_expr(&mut self, n: &mut YieldExpr)