Module syntax::visit

🔬 This is a nightly-only experimental API. (rustc_private)

AST walker. Each overridden visit method has full control over what happens with its node, it can do its own traversal of the node's children, call visit::walk_* to apply the default traversal algorithm, or prevent deeper traversal by doing nothing.

Note: it is an important invariant that the default visitor walks the body of a function in "execution order" (more concretely, reverse post-order with respect to the CFG implied by the AST), meaning that if AST node A may execute before AST node B, then A is visited first. The borrow checker in particular relies on this property.

Note: walking an AST before macro expansion is probably a bad idea. For instance, a walker looking for item names in a module will miss all of those that are created by the expansion of a macro.

Enums

FnKind

[ Experimental ]

Traits

Visitor

[ Experimental ] Each method of the Visitor trait is a hook to be potentially overridden. Each method's default implementation recursively visits the substructure of the input via the corresponding walk method; e.g. the visit_mod method by default calls visit::walk_mod.

Functions

walk_arm	[ Experimental ]
walk_assoc_type_binding	[ Experimental ]
walk_block	[ Experimental ]
walk_crate	[ Experimental ]
walk_enum_def	[ Experimental ]
walk_expr	[ Experimental ]
walk_fn	[ Experimental ]
walk_fn_decl	[ Experimental ]
walk_fn_ret_ty	[ Experimental ]
walk_foreign_item	[ Experimental ]
walk_generics	[ Experimental ]
walk_ident	[ Experimental ]
walk_impl_item	[ Experimental ]
walk_item	[ Experimental ]
walk_lifetime	[ Experimental ]
walk_lifetime_def	[ Experimental ]
walk_local	[ Experimental ]
walk_mac	[ Experimental ]
walk_mod	[ Experimental ]
walk_opt_ident	[ Experimental ]
walk_opt_name	[ Experimental ]
walk_opt_sp_ident	[ Experimental ]
walk_pat	[ Experimental ]
walk_path	[ Experimental ]
walk_path_list_item	[ Experimental ]
walk_path_parameters	[ Experimental ]
walk_path_segment	[ Experimental ]
walk_poly_trait_ref	[ Experimental ]
walk_stmt	[ Experimental ]
walk_struct_def	[ Experimental ]
walk_struct_field	[ Experimental ]
walk_trait_item	[ Experimental ]
walk_trait_ref	[ Experimental ]
walk_ty	[ Experimental ]
walk_ty_param_bound	[ Experimental ]
walk_variant	[ Experimental ]
walk_vis	[ Experimental ]
walk_where_predicate	[ Experimental ]