1 error[E0666]: nested `impl Trait` is not allowed
2 --> $DIR/where-allowed.rs:47:51
4 LL | fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
7 | | nested `impl Trait` here
10 error[E0666]: nested `impl Trait` is not allowed
11 --> $DIR/where-allowed.rs:56:57
13 LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
16 | | nested `impl Trait` here
19 error[E0658]: `impl Trait` in type aliases is unstable
20 --> $DIR/where-allowed.rs:119:16
22 LL | type Out = impl Debug;
25 = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
26 = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
28 error[E0658]: `impl Trait` in type aliases is unstable
29 --> $DIR/where-allowed.rs:154:23
31 LL | type InTypeAlias<R> = impl Debug;
34 = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
35 = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
37 error[E0658]: `impl Trait` in type aliases is unstable
38 --> $DIR/where-allowed.rs:157:39
40 LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
43 = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
44 = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
46 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer param
47 --> $DIR/where-allowed.rs:15:40
49 LL | fn in_fn_parameter_in_parameters(_: fn(impl Debug)) { panic!() }
52 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
53 --> $DIR/where-allowed.rs:19:42
55 LL | fn in_fn_return_in_parameters(_: fn() -> impl Debug) { panic!() }
58 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer param
59 --> $DIR/where-allowed.rs:23:38
61 LL | fn in_fn_parameter_in_return() -> fn(impl Debug) { panic!() }
64 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
65 --> $DIR/where-allowed.rs:27:40
67 LL | fn in_fn_return_in_return() -> fn() -> impl Debug { panic!() }
70 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
71 --> $DIR/where-allowed.rs:31:49
73 LL | fn in_dyn_Fn_parameter_in_parameters(_: &dyn Fn(impl Debug)) { panic!() }
76 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
77 --> $DIR/where-allowed.rs:35:51
79 LL | fn in_dyn_Fn_return_in_parameters(_: &dyn Fn() -> impl Debug) { panic!() }
82 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
83 --> $DIR/where-allowed.rs:39:55
85 LL | fn in_dyn_Fn_parameter_in_return() -> &'static dyn Fn(impl Debug) { panic!() }
88 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
89 --> $DIR/where-allowed.rs:43:57
91 LL | fn in_dyn_Fn_return_in_return() -> &'static dyn Fn() -> impl Debug { panic!() }
94 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
95 --> $DIR/where-allowed.rs:47:51
97 LL | fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
100 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
101 --> $DIR/where-allowed.rs:52:53
103 LL | fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() }
106 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
107 --> $DIR/where-allowed.rs:56:57
109 LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
112 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
113 --> $DIR/where-allowed.rs:61:59
115 LL | fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() }
118 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
119 --> $DIR/where-allowed.rs:65:38
121 LL | fn in_Fn_parameter_in_generics<F: Fn(impl Debug)> (_: F) { panic!() }
124 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
125 --> $DIR/where-allowed.rs:69:40
127 LL | fn in_Fn_return_in_generics<F: Fn() -> impl Debug> (_: F) { panic!() }
130 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
131 --> $DIR/where-allowed.rs:82:32
133 LL | struct InBraceStructField { x: impl Debug }
136 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in path
137 --> $DIR/where-allowed.rs:86:41
139 LL | struct InAdtInBraceStructField { x: Vec<impl Debug> }
142 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
143 --> $DIR/where-allowed.rs:90:27
145 LL | struct InTupleStructField(impl Debug);
148 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
149 --> $DIR/where-allowed.rs:95:25
151 LL | InBraceVariant { x: impl Debug },
154 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
155 --> $DIR/where-allowed.rs:97:20
157 LL | InTupleVariant(impl Debug),
160 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return
161 --> $DIR/where-allowed.rs:108:23
163 LL | fn in_return() -> impl Debug;
166 = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
167 = help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
169 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return
170 --> $DIR/where-allowed.rs:125:34
172 LL | fn in_trait_impl_return() -> impl Debug { () }
175 = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
176 = help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
178 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `extern fn` param
179 --> $DIR/where-allowed.rs:138:33
181 LL | fn in_foreign_parameters(_: impl Debug);
184 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `extern fn` return
185 --> $DIR/where-allowed.rs:141:31
187 LL | fn in_foreign_return() -> impl Debug;
190 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
191 --> $DIR/where-allowed.rs:157:39
193 LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
196 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait
197 --> $DIR/where-allowed.rs:162:16
199 LL | impl PartialEq<impl Debug> for () {
202 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
203 --> $DIR/where-allowed.rs:167:24
205 LL | impl PartialEq<()> for impl Debug {
208 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
209 --> $DIR/where-allowed.rs:172:6
211 LL | impl impl Debug {
214 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
215 --> $DIR/where-allowed.rs:178:24
217 LL | impl InInherentImplAdt<impl Debug> {
220 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
221 --> $DIR/where-allowed.rs:184:11
223 LL | where impl Debug: Debug
226 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
227 --> $DIR/where-allowed.rs:191:15
229 LL | where Vec<impl Debug>: Debug
232 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bound
233 --> $DIR/where-allowed.rs:198:24
235 LL | where T: PartialEq<impl Debug>
238 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
239 --> $DIR/where-allowed.rs:205:17
241 LL | where T: Fn(impl Debug)
244 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
245 --> $DIR/where-allowed.rs:212:22
247 LL | where T: Fn() -> impl Debug
250 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
251 --> $DIR/where-allowed.rs:218:40
253 LL | struct InStructGenericParamDefault<T = impl Debug>(T);
256 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
257 --> $DIR/where-allowed.rs:222:36
259 LL | enum InEnumGenericParamDefault<T = impl Debug> { Variant(T) }
262 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
263 --> $DIR/where-allowed.rs:226:38
265 LL | trait InTraitGenericParamDefault<T = impl Debug> {}
268 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
269 --> $DIR/where-allowed.rs:230:41
271 LL | type InTypeAliasGenericParamDefault<T = impl Debug> = T;
274 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
275 --> $DIR/where-allowed.rs:234:11
277 LL | impl <T = impl Debug> T {}
280 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in type
281 --> $DIR/where-allowed.rs:241:40
283 LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
286 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
287 --> $DIR/where-allowed.rs:247:29
289 LL | let _in_local_variable: impl Fn() = || {};
292 error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in closure return
293 --> $DIR/where-allowed.rs:249:46
295 LL | let _in_return_in_local_variable = || -> impl Fn() { || {} };
298 error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
299 --> $DIR/where-allowed.rs:234:7
301 LL | impl <T = impl Debug> T {}
304 = note: `#[deny(invalid_type_param_default)]` on by default
305 = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
306 = note: for more information, see issue #36887 <https://github.com/rust-lang/rust/issues/36887>
308 error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
309 --> $DIR/where-allowed.rs:241:36
311 LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
314 = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
315 = note: for more information, see issue #36887 <https://github.com/rust-lang/rust/issues/36887>
317 error[E0118]: no nominal type found for inherent implementation
318 --> $DIR/where-allowed.rs:234:23
320 LL | impl <T = impl Debug> T {}
321 | ^ impl requires a nominal type
323 = note: either implement a trait on it or create a newtype to wrap it instead
325 error: aborting due to 49 previous errors
327 Some errors have detailed explanations: E0118, E0562, E0658, E0666.
328 For more information about an error, try `rustc --explain E0118`.