2 #![allow(clippy::blacklisted_name)]
3 #![warn(clippy::used_underscore_binding)]
5 macro_rules! test_macro {
12 /// Tests that we lint if we use a binding with a single leading underscore
13 fn prefix_underscore(_foo: u32) -> u32 {
17 /// Tests that we lint if we use a `_`-variable defined outside within a macro expansion
18 fn in_macro(_foo: u32) {
20 assert_eq!(_foo, _foo);
25 // Struct for testing use of fields prefixed with an underscore
26 struct StructFieldTest {
27 _underscore_field: u32,
30 /// Tests that we lint the use of a struct field which is prefixed with an underscore
31 fn in_struct_field() {
32 let mut s = StructFieldTest { _underscore_field: 0 };
33 s._underscore_field += 1;
36 /// Tests that we do not lint if the underscore is not a prefix
37 fn non_prefix_underscore(some_foo: u32) -> u32 {
41 /// Tests that we do not lint if we do not use the binding (simple case)
42 fn unused_underscore_simple(_foo: u32) -> u32 {
46 /// Tests that we do not lint if we do not use the binding (complex case). This checks for
47 /// compatibility with the built-in `unused_variables` lint.
48 fn unused_underscore_complex(mut _foo: u32) -> u32 {
54 ///Test that we do not lint for multiple underscores
55 fn multiple_underscores(__foo: u32) -> u32 {
59 // Non-variable bindings with preceding underscore
67 /// Tests that we do not lint for non-variable bindings
71 let _e = match _EnumTest::_Value(_StructTest) {
72 _EnumTest::_Empty => 0,
73 _EnumTest::_Value(_st) => 1,
81 // tests of unused_underscore lint
82 let _ = prefix_underscore(foo);
85 // possible false positives
86 let _ = non_prefix_underscore(foo);
87 let _ = unused_underscore_simple(foo);
88 let _ = unused_underscore_complex(foo);
89 let _ = multiple_underscores(foo);