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pub trait Parser<E> { | ||
fn parse(&self) -> E; | ||
} | ||
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impl<E, T: Fn() -> E> Parser<E> for T { | ||
fn parse(&self) -> E { | ||
self() | ||
} | ||
} | ||
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pub fn recursive_fn<E>() -> impl Parser<E> { | ||
//~^ ERROR: cycle detected | ||
move || recursive_fn().parse() | ||
//~^ ERROR: type annotations needed | ||
//~| ERROR: no method named `parse` found for opaque type | ||
} | ||
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fn main() {} |
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error[E0282]: type annotations needed | ||
--> $DIR/recursive-bound-eval.rs:13:28 | ||
| | ||
LL | move || recursive_fn().parse() | ||
| ^^^^^ cannot infer type | ||
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error[E0599]: no method named `parse` found for opaque type `impl Parser<_>` in the current scope | ||
--> $DIR/recursive-bound-eval.rs:13:28 | ||
| | ||
LL | move || recursive_fn().parse() | ||
| ^^^^^ method not found in `impl Parser<_>` | ||
| | ||
= help: items from traits can only be used if the trait is implemented and in scope | ||
help: trait `Parser` which provides `parse` is implemented but not in scope; perhaps you want to import it | ||
| | ||
LL + use Parser; | ||
| | ||
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error[E0391]: cycle detected when computing type of opaque `recursive_fn::{opaque#0}` | ||
--> $DIR/recursive-bound-eval.rs:11:29 | ||
| | ||
LL | pub fn recursive_fn<E>() -> impl Parser<E> { | ||
| ^^^^^^^^^^^^^^ | ||
| | ||
note: ...which requires type-checking `recursive_fn`... | ||
--> $DIR/recursive-bound-eval.rs:13:13 | ||
| | ||
LL | move || recursive_fn().parse() | ||
| ^^^^^^^^^^^^^^ | ||
= note: ...which requires evaluating trait selection obligation `recursive_fn::{opaque#0}: core::marker::Unpin`... | ||
= note: ...which again requires computing type of opaque `recursive_fn::{opaque#0}`, completing the cycle | ||
note: cycle used when computing type of `recursive_fn::{opaque#0}` | ||
--> $DIR/recursive-bound-eval.rs:11:29 | ||
| | ||
LL | pub fn recursive_fn<E>() -> impl Parser<E> { | ||
| ^^^^^^^^^^^^^^ | ||
= note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information | ||
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error: aborting due to 3 previous errors | ||
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Some errors have detailed explanations: E0282, E0391, E0599. | ||
For more information about an error, try `rustc --explain E0282`. |