Module clippy_utils::ty

Util methods for rustc_middle::ty

Modules

• type_certainty 🔒
  A heuristic to tell whether an expression’s type can be determined purely from its subexpressions, and the arguments and locals they use. Put another way, expr_type_is_certain tries to tell whether an expression’s type can be determined without appeal to the surrounding context.

Structs

• AdtVariantInfo

Enums

• EnumValue
• ExprFnSig
  A signature for a function like type.

Functions

• adt_and_variant_of_res
  Gets the struct or enum variant from the given Res
• all_predicates_of
  Gets an iterator over all predicates which apply to the given item.
• approx_ty_size
  Comes up with an “at least” guesstimate for the type’s size, not taking into account the layout of type parameters.
• assert_generic_args_match 🔒
  Asserts that the given arguments match the generic parameters of the given item.
• can_partially_move_ty
  Checks whether a type can be partially moved.
• contains_adt_constructor
  Walks into ty and returns true if any inner type is an instance of the given adt constructor.
• contains_ty_adt_constructor_opaque
  Walks into ty and returns true if any inner type is an instance of the given type, or adt constructor of the same type.
• expr_sig
  If the expression is function like, get the signature for it.
• expr_type_is_certain
• for_each_top_level_late_bound_region
• get_discriminant_value
  Gets the value of the given variant.
• get_iterator_item_ty
  Resolves <T as Iterator>::Item for T Do not invoke without first verifying that the type implements Iterator
• get_type_diagnostic_name
  Get the diagnostic name of a type, e.g. sym::HashMap. To check if a type implements a trait marked with a diagnostic item use implements_trait.
• has_debug_impl
  This checks whether a given type is known to implement Debug.
• has_drop
  Checks whether this type implements Drop.
• has_iter_method
  Returns true if ty has iter or iter_mut methods
• implements_trait
  Checks whether a type implements a trait. The function returns false in case the type contains an inference variable.
• implements_trait_with_env
  Same as implements_trait but allows using a ParamEnv different from the lint context.
• implements_trait_with_env_from_iter
  Same as implements_trait_from_env but takes the arguments as an iterator.
• is_c_void
  Check if the given type is either core::ffi::c_void, std::os::raw::c_void, or one of the platform specific libc::<platform>::c_void types in libc.
• is_copy
  Checks if the given type implements copy.
• is_interior_mut_ty
  Check if given type has inner mutability such as std::cell::Cell or std::cell::RefCell etc.
• is_isize_or_usize
  Return true if the passed typ is isize or usize.
• is_must_use_ty
• is_never_like
  Returns whether ty is never-like; i.e., ! (never) or an enum with zero variants.
• is_non_aggregate_primitive_type
  Returns true if the given type is a non aggregate primitive (a bool or char, any integer or floating-point number type). For checking aggregation of primitive types (e.g. tuples and slices of primitive type) see is_recursively_primitive_type
• is_normalizable
  Checks if Ty is normalizable. This function is useful to avoid crashes on layout_of.
• is_normalizable_helper 🔒
• is_recursively_primitive_type
  Returns true if the given type is a primitive (a bool or char, any integer or floating-point number type, a str, or an array, slice, or tuple of those types).
• is_type_diagnostic_item
  Checks if the type is equal to a diagnostic item. To check if a type implements a trait marked with a diagnostic item use implements_trait.
• is_type_lang_item
  Checks if the type is equal to a lang item.
• is_type_ref_to_diagnostic_item
  Checks if the type is a reference equals to a diagnostic item
• is_uninit_value_valid_for_ty
  Checks if a given type looks safe to be uninitialized.
• is_uninit_value_valid_for_ty_fallback 🔒
  A fallback for polymorphic types, which are not supported by check_validity_requirement.
• make_normalized_projection
  Normalizes the named associated type in the given impl or trait impl.
• make_normalized_projection_with_regions
• make_projection
  Makes the projection type for the named associated type in the given impl or trait impl.
• match_type
  Checks if type is struct, enum or union type with the given def path.
• needs_ordered_drop
  Checks if the drop order for a type matters. Some std types implement drop solely to deallocate memory. For these types, and composites containing them, changing the drop order won’t result in any observable side effects.
• normalize_with_regions
• peel_mid_ty_refs
  Peels off all references on the type. Returns the underlying type and the number of references removed.
• peel_mid_ty_refs_is_mutable
  Peels off all references on the type. Returns the underlying type, the number of references removed, and whether the pointer is ultimately mutable or not.
• read_explicit_enum_value
  Attempts to read the given constant as though it were an enum value.
• same_type_and_consts
  Returns true if types a and b are same types having same Const generic args, otherwise returns false
• sig_for_projection 🔒
• sig_from_bounds 🔒
• ty_is_fn_once_param
  Checks if the type is a type parameter implementing FnOnce, but not FnMut.
• ty_sig
  If the type is function like, get the signature for it.
• type_diagnostic_name
  Gets the diagnostic name of the type, if it has one
• type_is_unsafe_function
  Returns true if the given type is an unsafe function.
• walk_ptrs_hir_ty
  Returns the base type for HIR references and pointers.
• walk_ptrs_ty_depth
  Returns the base type for references and raw pointers, and count reference depth.