Expected struct file found enum result

Author: zpqv

August undefined, 2024

WebJul 4, 2024 · I am trying to generify a Result that is returned by the reqwest::blocking::get function. It returns a Result <reqwest::blocking::response, reqwest::error>WebMay 23, 2024 · fn open_file_impl () -> Option { use tauri::api::dialog::Response; let result = tauri::api::dialog::select (None,None).ok ()?; if let Response::Okay (path) = …

Expected enum `std::result::Result`, found `()` when using for loop

WebJan 22, 2024 · The result type of this function is Result> and you return Err (Error)). Just put a box around your errors, e.g. Err (Box::new (err_resp)). – CoronA Jan 22, 2024 at 2:04 @CoronA it gives me a new issue. ? couldn't convert the error to std::boxed::Box – Jinn Jan 22, 2024 at 2:21WebAug 30, 2024 · Sorted by: 7. No ; Returns can only be used at the end of a block. To fix this you can either: pub fn new (s: String) -> Option { if s.len () > 10 { return None; // Add a early return here } Some (10) } Or. pub fn new (s: String) -> Option { if s.len () > 10 { None } else { Some (10) } // This is now the end of the function block. from where does the chenab originate

rust - expected opaque type, found enum `Result` - Stack Overflow

WebOct 21, 2016 · 1 Answer Sorted by: 3 You linked to the documentation of next, but you're not using next (not directly anyway), you're using a for loop. In a for loop the type of the iteration variable (i.e. the type of line in your code) is the Item type of the iterator, which in your case is Result.WebJun 7, 2024 · use actix_web:: {App, HttpServer}; use anyhow::Result; mod error; # [actix_rt::main] async fn main () -> Result< ()> { HttpServer::new ( App::new ()) .bind ("127.0.0.1:8080")? .run () .await.map_err (anyhow::Error::from) } Share Improve this answer Follow answered Apr 18, 2024 at 2:55 Caleb Hattingh 8,885 2 31 43 Add a …Webmismatched types expected enum `std::result::Result`, found () note: expected type `std::result::Result<(), std::fmt::Error>` found type `()`rustc(E0308) From what I …ghostbusters controller

Why does removing return give me an error: expected type `()` but found ...

error handling - Unable to read file contents to string - Result …

WebAug 1, 2024 · This topic was automatically closed 90 days after the last reply. We invite you to open a new topic if you have further questions or comments. ghostbusters costume for boysWebAug 1, 2024 · I am trying to use the anyhow crate, specifically anyhow::Result. The sample code is. use anyhow::Result; fn main () -> Result< ()> { std::fs::read_to_string … ghostbusters converse

"WebAug 6, 2024 · I've found on the Rocket documentation that is really easy to send JSON as a response: You just have to use the Serde library. Unfortunatly, that wasn't so simple for me... Here is my current code : # [derive (Serialize,Deserialize)] pub struct Printers { pub printers: Vec, } # [derive (Serialize,Deserialize)] pub struct Printer { pub ..." - Expected struct file found enum result

Expected struct file found enum result

but the function it is called in ret...WebMay 12, 2024 · The file is actually a Result in the 2nd snippet. We can iterate over the Ok value in a Result, just like another any other container. So if the Result is an Ok value, we flat_map over the Ok value, turning it into an iterator that iterates the lines in the buffer, and if it's an Err, we do nothing and just return the iterator. –

Did you know?

WebMar 11, 2024 · The current issue in your code is that string_for_array.to_string() creates a new String, but the array_display array contains &str references.. The suggestion the compiler gives here (replacing with &string_for_array.to_string()) does not work, because the result of .to_string() will be freed at the end of the line and you would have an invalid …WebAug 14, 2024 · It didn't look as a feasible task for me to combine the lookup_* functions, because the closure in the common function would have to take a very complex set of arguments. And I would need to put too many constraints into that function. For example, in the search for enum, I don't need the order of modules to be stable, but I would need to …

WebJul 14, 2024 · I have some code that needs to create and use a quick_xml::Writer with either a File or Cursor depending on user input. What is the proper Rust way (non-inheritance/no downcasting) to create a WriterWebAug 23, 2024 · I'm pretty sure the from_timestamp function is returning a DateTime struct and not a Result, so I don't know what "expected struct chrono::NaiveDateTime, found enum std::result::Result" may mean. rust

WebMar 11, 2024 · expected type `fn(Value) -> Result` found type `fn(Value) -> Result` You can't return the wrong type; that's just a fundamental condition of a statically typed language. Return the correct type instead: Result.WebOct 17, 2024 · 1 Answer Sorted by: 6 The value returned by async fn is a Future. A Future is an asynchronous computation that can produce a value (although that value may be empty, e.g. ()). Also inside an async fn, you can use .await to wait for the completion of another type that implements the Future trait.

WebApr 25, 2024 · The example from the "chaining computations" section of the Tokio docs does not compile: "expected struct `std::io::Error`, found ()" 6 tokio::select! but for a Vec of futures

WebJul 1, 2014 · Generics in Rust :: mismatched types expected struct `Token<'_, T>` found struct `Token<'_, i32> Hot Network Questions If electric field inside a conductor is always zero, then why do free electrons move?from where does solar wind originate weegyWebMar 23, 2015 · You have a Result because File::open (&path) can fail. Failure is represented with the Result type. A Result may be either an Ok, which is the success case, or an Err, the failure case. You need to handle the failure case somehow. The easiest is to just die on failure, using expect: let mut file = File::open (&path).expect ("Unable to open"); from where does the ravi river originateWebJun 24, 2024 · This pattern is so common that rust's result gives a lot of utilities to make this kind of things easier. Here, the map_err function would make it more straightforward: map_err see:from where does the song of rain originateWebJun 9, 2024 · In this example, the error occurs because State::Failed has a field which isn't matched. It should be State::Failed (ref msg). In my case I'm matching the field of my enum because I'm doing OperationMode::CBC (_). Why does the error happen? enums rust pattern-matching Share Improve this question Follow edited Jun 9, 2024 at 14:10 …ghostbusters computer game from where does the song originate class 11WebOne "Rust-y" way of solving this is typically to redeclare a variable with the same name: let date_1 = String::new (); /* type: std::string::String */ // ... let date_1 = date_1.split ("/"); /* type: std::str::Split<'_, &str> */. The second date_1 is a different variable (hence it can have a different type), but it has the same name as the ...from where does the pequod first set sailWebMar 26, 2015 · The simplest is to unwrap the result, which causes a thread panic on failure cases. fn allocate (path: &str) -> File { File::create (Path::new (path)).unwrap () } You could also return a Result of your own, and then force the caller to …ghostbusters costume adults uk