| // Needed for `type Y = impl Trait<_>` and `type B = _;` |
| #![feature(associated_type_defaults)] |
| // revisions: min_tait full_tait |
| #![feature(min_type_alias_impl_trait)] |
| #![cfg_attr(full_tait, feature(type_alias_impl_trait))] |
| //[full_tait]~^ WARN incomplete |
| // This test checks that it is not possible to enable global type |
| // inference by using the `_` type placeholder. |
| |
| fn test() -> _ { 5 } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test2() -> (_, _) { (5, 5) } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| static TEST3: _ = "test"; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| static TEST4: _ = 145; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| static TEST5: (_, _) = (1, 2); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test6(_: _) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test6_b<T>(_: _, _: T) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test6_c<T, K, L, A, B>(_: _, _: (T, K, L, A, B)) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test7(x: _) { let _x: usize = x; } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test8(_f: fn() -> _) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| //~^^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| struct Test9; |
| |
| impl Test9 { |
| fn test9(&self) -> _ { () } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn test10(&self, _x : _) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| fn test11(x: &usize) -> &_ { |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| &x |
| } |
| |
| unsafe fn test12(x: *const usize) -> *const *const _ { |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| &x |
| } |
| |
| impl Clone for Test9 { |
| fn clone(&self) -> _ { Test9 } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn clone_from(&mut self, other: _) { *self = Test9; } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| struct Test10 { |
| a: _, |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| b: (_, _), |
| } |
| |
| pub fn main() { |
| static A = 42; |
| //~^ ERROR missing type for `static` item |
| static B: _ = 42; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| static C: Option<_> = Some(42); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test() -> _ { 5 } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test2() -> (_, _) { (5, 5) } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| static FN_TEST3: _ = "test"; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| static FN_TEST4: _ = 145; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| static FN_TEST5: (_, _) = (1, 2); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test6(_: _) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test7(x: _) { let _x: usize = x; } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test8(_f: fn() -> _) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| //~^^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| struct FnTest9; |
| |
| impl FnTest9 { |
| fn fn_test9(&self) -> _ { () } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test10(&self, _x : _) { } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| impl Clone for FnTest9 { |
| fn clone(&self) -> _ { FnTest9 } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn clone_from(&mut self, other: _) { *self = FnTest9; } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| struct FnTest10 { |
| a: _, |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| b: (_, _), |
| } |
| |
| fn fn_test11(_: _) -> (_, _) { panic!() } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| //~| ERROR type annotations needed |
| |
| fn fn_test12(x: i32) -> (_, _) { (x, x) } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn fn_test13(x: _) -> (i32, _) { (x, x) } |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| trait T { |
| fn method_test1(&self, x: _); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| fn method_test2(&self, x: _) -> _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| fn method_test3(&self) -> _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| fn assoc_fn_test1(x: _); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| fn assoc_fn_test2(x: _) -> _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| fn assoc_fn_test3() -> _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| struct BadStruct<_>(_); |
| //~^ ERROR expected identifier, found reserved identifier `_` |
| //~| ERROR the type placeholder `_` is not allowed within types on item signatures |
| trait BadTrait<_> {} |
| //~^ ERROR expected identifier, found reserved identifier `_` |
| impl BadTrait<_> for BadStruct<_> {} |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| fn impl_trait() -> impl BadTrait<_> { |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| unimplemented!() |
| } |
| |
| struct BadStruct1<_, _>(_); |
| //~^ ERROR expected identifier, found reserved identifier `_` |
| //~| ERROR expected identifier, found reserved identifier `_` |
| //~| ERROR the name `_` is already used |
| //~| ERROR the type placeholder `_` is not allowed within types on item signatures |
| struct BadStruct2<_, T>(_, T); |
| //~^ ERROR expected identifier, found reserved identifier `_` |
| //~| ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| type X = Box<_>; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| |
| struct Struct; |
| trait Trait<T> {} |
| impl Trait<usize> for Struct {} |
| type Y = impl Trait<_>; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| fn foo() -> Y { |
| Struct |
| } |
| |
| trait Qux { |
| type A; |
| type B = _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| const C: _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| const D: _ = 42; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| // type E: _; // FIXME: make the parser propagate the existence of `B` |
| type F: std::ops::Fn(_); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| impl Qux for Struct { |
| type A = _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| type B = _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| const C: _; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| //~| ERROR associated constant in `impl` without body |
| const D: _ = 42; |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| } |
| |
| fn map<T>(_: fn() -> Option<&'static T>) -> Option<T> { |
| None |
| } |
| |
| fn value() -> Option<&'static _> { |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |
| Option::<&'static u8>::None |
| } |
| |
| const _: Option<_> = map(value); |
| //~^ ERROR the type placeholder `_` is not allowed within types on item signatures |