6 lines
16 KiB
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6 lines
16 KiB
Text
{"message":"the `?` operator can only be used in an async function that returns `Result` or `Option` (or another type that implements `FromResidual`)","code":{"code":"E0277","explanation":"You tried to use a type which doesn't implement some trait in a place which\nexpected that trait.\n\nErroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n foo.bar();\n}\n\nfn main() {\n // we now call the method with the i32 type, which doesn't implement\n // the Foo trait\n some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n fn bar(&self);\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n fn bar(&self) {}\n}\n\nfn some_func<T: Foo>(foo: T) {\n foo.bar(); // we can now use this method since i32 implements the\n // Foo trait\n}\n\nfn main() {\n some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n // implemented for the type `T`\n}\n\nfn main() {\n // We now call the method with the i32 type,\n // which *does* implement the Debug trait.\n some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function. Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function. It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n println!(\"{:?}\", foo);\n}\n\nfn main() {\n // Calling the method is still fine, as i32 implements Debug.\n some_func(5i32);\n\n // This would fail to compile now:\n // struct WithoutDebug;\n // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"src/main.rs","byte_start":287,"byte_end":288,"line_start":13,"line_end":13,"column_start":15,"column_end":16,"is_primary":true,"text":[{"text":" .await?","highlight_start":15,"highlight_end":16}],"label":"cannot use the `?` operator in an async function that returns `()`","suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"src/main.rs","byte_start":287,"byte_end":288,"line_start":13,"line_end":13,"column_start":15,"column_end":16,"is_primary":false,"text":[{"text":" .await?","highlight_start":15,"highlight_end":16}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"desugaring of operator `?`","def_site_span":{"file_name":"src/main.rs","byte_start":0,"byte_end":0,"line_start":1,"line_end":1,"column_start":1,"column_end":1,"is_primary":false,"text":[],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}}},{"file_name":"src/main.rs","byte_start":207,"byte_end":346,"line_start":11,"line_end":16,"column_start":25,"column_end":2,"is_primary":false,"text":[{"text":"async fn get_articles() {","highlight_start":25,"highlight_end":26},{"text":" let resp = reqwest::get(\"https://dennis.doordesk.net/home\")","highlight_start":1,"highlight_end":64},{"text":" .await?","highlight_start":1,"highlight_end":16},{"text":" .json::<Vec<Article>>();","highlight_start":1,"highlight_end":33},{"text":" return resp.await;","highlight_start":1,"highlight_end":23},{"text":"}","highlight_start":1,"highlight_end":2}],"label":"this function should return `Result` or `Option` to accept `?`","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `FromResidual<Result<Infallible, reqwest::Error>>` is not implemented for `()`","code":null,"level":"help","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror[E0277]\u001b[0m\u001b[0m\u001b[1m: the `?` operator can only be used in an async function that returns `Result` or `Option` (or another type that implements `FromResidual`)\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:13:15\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m11\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0masync fn get_articles() {\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m_________________________-\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m12\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m let resp = reqwest::get(\"https://dennis.doordesk.net/home\")\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m13\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m .await?\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m^\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9mcannot use the `?` operator in an async function that returns `()`\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m14\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m .json::<Vec<Article>>();\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m15\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m return resp.await;\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m16\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m}\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|_-\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12mthis function should return `Result` or `Option` to accept `?`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mhelp\u001b[0m\u001b[0m: the trait `FromResidual<Result<Infallible, reqwest::Error>>` is not implemented for `()`\u001b[0m\n\n"}
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{"message":"mismatched types","code":{"code":"E0308","explanation":"Expected type did not match the received type.\n\nErroneous code examples:\n\n```compile_fail,E0308\nfn plus_one(x: i32) -> i32 {\n x + 1\n}\n\nplus_one(\"Not a number\");\n// ^^^^^^^^^^^^^^ expected `i32`, found `&str`\n\nif \"Not a bool\" {\n// ^^^^^^^^^^^^ expected `bool`, found `&str`\n}\n\nlet x: f32 = \"Not a float\";\n// --- ^^^^^^^^^^^^^ expected `f32`, found `&str`\n// |\n// expected due to this\n```\n\nThis error occurs when an expression was used in a place where the compiler\nexpected an expression of a different type. It can occur in several cases, the\nmost common being when calling a function and passing an argument which has a\ndifferent type than the matching type in the function declaration.\n"},"level":"error","spans":[{"file_name":"src/main.rs","byte_start":333,"byte_end":343,"line_start":15,"line_end":15,"column_start":12,"column_end":22,"is_primary":true,"text":[{"text":" return resp.await;","highlight_start":12,"highlight_end":22}],"label":"expected `()`, found `Result<Vec<Article>, Error>`","suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"src/main.rs","byte_start":333,"byte_end":343,"line_start":15,"line_end":15,"column_start":12,"column_end":22,"is_primary":false,"text":[{"text":" return resp.await;","highlight_start":12,"highlight_end":22}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"desugaring of `await` expression","def_site_span":{"file_name":"src/main.rs","byte_start":0,"byte_end":0,"line_start":1,"line_end":1,"column_start":1,"column_end":1,"is_primary":false,"text":[],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}}}],"children":[{"message":"expected unit type `()`\n found enum `Result<Vec<Article>, reqwest::Error>`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror[E0308]\u001b[0m\u001b[0m\u001b[1m: mismatched types\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:15:12\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m15\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m return resp.await;\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m^^^^^^^^^^\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9mexpected `()`, found `Result<Vec<Article>, Error>`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: expected unit type `\u001b[0m\u001b[0m\u001b[1m()\u001b[0m\u001b[0m`\u001b[0m\n\u001b[0m found enum `\u001b[0m\u001b[0m\u001b[1mResult<Vec<Article>, reqwest::Error>\u001b[0m\u001b[0m`\u001b[0m\n\n"}
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{"message":"`impl Future<Output = ()>` is not an iterator","code":{"code":"E0277","explanation":"You tried to use a type which doesn't implement some trait in a place which\nexpected that trait.\n\nErroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n foo.bar();\n}\n\nfn main() {\n // we now call the method with the i32 type, which doesn't implement\n // the Foo trait\n some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n fn bar(&self);\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n fn bar(&self) {}\n}\n\nfn some_func<T: Foo>(foo: T) {\n foo.bar(); // we can now use this method since i32 implements the\n // Foo trait\n}\n\nfn main() {\n some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n // implemented for the type `T`\n}\n\nfn main() {\n // We now call the method with the i32 type,\n // which *does* implement the Debug trait.\n some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function. Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function. It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n println!(\"{:?}\", foo);\n}\n\nfn main() {\n // Calling the method is still fine, as i32 implements Debug.\n some_func(5i32);\n\n // This would fail to compile now:\n // struct WithoutDebug;\n // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"src/main.rs","byte_start":400,"byte_end":414,"line_start":20,"line_end":20,"column_start":20,"column_end":34,"is_primary":true,"text":[{"text":" for article in get_articles() {","highlight_start":20,"highlight_end":34}],"label":"`impl Future<Output = ()>` is not an iterator","suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"src/main.rs","byte_start":400,"byte_end":414,"line_start":20,"line_end":20,"column_start":20,"column_end":34,"is_primary":false,"text":[{"text":" for article in get_articles() {","highlight_start":20,"highlight_end":34}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"desugaring of `for` loop","def_site_span":{"file_name":"src/main.rs","byte_start":0,"byte_end":0,"line_start":1,"line_end":1,"column_start":1,"column_end":1,"is_primary":false,"text":[],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}}}],"children":[{"message":"the trait `Iterator` is not implemented for `impl Future<Output = ()>`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"required for `impl Future<Output = ()>` to implement `IntoIterator`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror[E0277]\u001b[0m\u001b[0m\u001b[1m: `impl Future<Output = ()>` is not an iterator\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:20:20\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m20\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m for article in get_articles() {\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m^^^^^^^^^^^^^^\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m`impl Future<Output = ()>` is not an iterator\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mhelp\u001b[0m\u001b[0m: the trait `Iterator` is not implemented for `impl Future<Output = ()>`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: required for `impl Future<Output = ()>` to implement `IntoIterator`\u001b[0m\n\n"}
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{"message":"aborting due to 3 previous errors","code":null,"level":"error","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror\u001b[0m\u001b[0m\u001b[1m: aborting due to 3 previous errors\u001b[0m\n\n"}
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{"message":"Some errors have detailed explanations: E0277, E0308.","code":null,"level":"failure-note","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1mSome errors have detailed explanations: E0277, E0308.\u001b[0m\n"}
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{"message":"For more information about an error, try `rustc --explain E0277`.","code":null,"level":"failure-note","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1mFor more information about an error, try `rustc --explain E0277`.\u001b[0m\n"}
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