Powered by Discourse, best viewed with JavaScript enabled, Anyhow::Result fails to compile 'expected struct'. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Firstly, a lot of the suggestions didn't really make sense (if you used a &str where a String was expected, `.to_ascii_uppercase()` is probably not the solution you were hoping for). Convert an ascii string literal to &[u8] in Rust? Powered by Discourse, best viewed with JavaScript enabled, Expected type parameter `A`, found `&str` in trait method. What is this object inside my bathtub drain that is causing a blockage? But what happens in Rust? Why does bunched up aluminum foil become so extremely hard to compress? Do not hesitate to share your response here to help other visitors like you. so dropping the table and creating it again is no problem yet. (self.current_note); line that could be hidden in an arbitrary amount of code. 1 Like 2e71828 August 8, 2022, 8:08am 3 LarkyRust: let query = &args [1].clone (); let filename = &args [2].clone (); The operator precedence here may not be what you expect. Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. What does Bell mean by polarization of spin state? Can someone please help me make sense of the error message above? Is Spider-Man the only Marvel character that has been represented as multiple non-human characters? My father is ill and booked a flight to see him - can I travel on my other passport? This is the same as: to your account. to your account, Edit: there is a simpler example I found below in the comments. but, the lifetime must be valid for the static lifetime I actually don't know what the first "lifetime" is but the "static lifetime" must be the thread spawning closure which is never pointed to (via the really helpful ascii lines and arrows). The first and last names are mandatory, whereas the middle name may or may not be present. donnez-moi or me donner? You can't make collect() turn it into Inventory::<&str,&str>::collect() from inside. Is it possible for rockets to exist in a world that is only in the early stages of developing jet aircraft? Usually A: Into is used in such cases, and self.set(record.warehouse.into(), should work. Connect and share knowledge within a single location that is structured and easy to search. How can an accidental cat scratch break skin but not damage clothes? Making statements based on opinion; back them up with references or personal experience. ("Welcome to tic tac toe"); println! I am making a tic-tac-toe game. Manhwa where a girl becomes the villainess, goes to school and befriends the heroine. To fix this, convert the error. Change), You are commenting using your Facebook account. String There are a couple of pathways towards declaring a string in Rust. I hit this in my first test program post-1.0 (implementing "cat"). It's valid to call Inventory::::collect() and then your code will try to assign &str to u32. Right, .as_deref() doesn't do anything if the Option already contains a reference. If you have nullable field in db probably this is causing all the errors in macros. Expected type string, found integer. On the other hand, here are some of the available choices for declaring string objects. Convert Vec into a slice of &str in Rust? In this case what would really help is to provide the output of EXPLAIN (VERBOSE, FORMAT JSON) as that's what the macros use for nullability inference. Usually A: Into is used in such cases, and self.set(record.warehouse.into(), should work. Find centralized, trusted content and collaborate around the technologies you use most. Citing my unpublished master's thesis in the article that builds on top of it, What are good reasons to create a city/nation in which a government wouldn't let you leave. I wanted to implement merge sort with recursion. The caller of this method chooses. How can I manually analyse this simple BJT circuit? I have noticed the only pattern is when it has this error, every single struct is considered nullable vs incorrect ones singled out out of a list. Aside from humanoid, what other body builds would be viable for an (intelligence wise) human-like sentient species? Movie in which a group of friends are driven to an abandoned warehouse full of vampires. (self.current_note); line. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I will investigate more, thanks! Is it possible to type a single quote/paren/etc. Making statements based on opinion; back them up with references or personal experience. It's the chain identifier that's underlined/pointed towards here which is (to me) confusing; If I follow the "expected reference, found integer" advice naively and without trying to get to the bottom of things I may think "ok, the problem is with the chain call, it . 13 comments Contributor D1plo1d commented on Jan 27, 2020 edited I am using Option<String> to represent a nullable String but my code bellow complains that it expected a String instead of Option. I wanted to implement merge sort with recursion. offline mode mismatched types expected struct X, found enum, Store Justifications along with the rest of the block, https://docs.rs/sqlx/0.5.7/sqlx/macro.query.html#overrides-cheatsheet. Here is my code: The problem is, when I am trying to compile it, I am getting the following error: Do you have any idea why am I getting this strange error! Living room light switches do not work during warm/hot weather. Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. [Solved] running precommit hooks with codeql/GHAS sast scans? Please vote for the answer that helped you in order to help others find out which is the most helpful answer. [Solved] Install R package to correct library path in Ubuntu. Please log in using one of these methods to post your comment: You are commenting using your WordPress.com account. I don't really understand what is going on because, as you can see, "infoTexto" is actually a String and "info" is inside of the scope. is the same as &[u8]. The perfect solution would involve smarter unification such that &String followed by &str . It seems, I am missing something. I know that the error goes away by using Err (eff) => Err (eff), but the way I see it, the above should work as well. Try .map(String::as_str) instead. which one to use in this conversation? Asking for help, clarification, or responding to other answers. Adding NOT NULL to the foreign key definition fixed this: fk_name smallint REFERENCES pk_table_name NOT NULL. You don't chose the types. Reason of the error expected (), found struct `std::vec::Vec` in Rust? Hi everyone, im trying to build a rest service using rocket, but im stuck in the problem described in the title. How can I shave a sheet of plywood into a wedge shim? What happens here is that the closure tries to use self which conflicts with the static lifetime. Since the types don't match, it fails to compile. The error for the first example is now: Fixing the errors and following more compiler errors appropriately fixes the problem. What is this object inside my bathtub drain that is causing a blockage? privacy statement. The fact that this is the one of about five google results for this error message seems crazy to me! Is it OK to pray any five decades of the Rosary or do they have to be in the specific set of mysteries? Please vote for the answer that helped you in order to help others find out which is the most helpful answer. You are using an out of date browser. The new user of Rust is trying to set up Gtk signal handlers. Well occasionally send you account related emails. 1 Answer Sorted by: 127 You can use the as_bytes method: fn f (s: & [u8]) {} pub fn main () { let x = "a"; f (x.as_bytes ()) } or, in your specific example, you could use a byte literal: let x = b"a"; f (x) Share I found simpler one of these in the wild on dbg! They require the type parameter to be one specific exact type, and your code is not even allowed to know what type that is! Do not hesitate to share your thoughts here to help others. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Since string_for_array is modified later, it can't be used. 1 In this code: use chrono::Utc; fn main() { let current_timestamp: String = Utc::now().to_rfc3339(); let iter1 = vec! Did yu add it to each of the six constraints on A and B ? What's the difference between using the return statement and omitting the semicolon in Rust? New replies are no longer allowed. This subreddit is for asking questions about the programming language Rust. I don't get the expected struct String, found struct File message either. (Ideal). Citing my unpublished master's thesis in the article that builds on top of it. and our The type itself is a struct of the form: pub struct String { vec: Vec<u8>, } You're letting the caller of the method choose what type they want for A, and it can be any type. Is it possible to type a single quote/paren/etc. Does substituting electrons with muons change the atomic shell configuration? "expected &&str, found &&str" and missing context. Once I add + std::convert::From it gave me: I tried implementing Copy as below but same error remained: for Into to work you need to change: Why do you make Warehouse generic, when your code doesn't want it to be generic? Change). 1 Like jongiddy August 20, 2022, 7:03am 3 The compiler is telling you that Html::parse_fragment () requires a &str, but you gave it something else, an Option< ()>. rev2023.6.2.43474. (LogOut/ We invite you to open a new topic if you have further questions or comments. The foreign key is defined in another table as: fk_name smallint REFERENCES pk_table_name. The problem is that the error message does not point to self in the dbg! or, in your specific example, you could use a byte literal: Thanks for contributing an answer to Stack Overflow! Can I trust my bikes frame after I was hit by a car if there's no visible cracking? To fix this, convert the error. I am trying to call back the strings from the struct but get the error, expected struct `std::string::String`, found `&str`. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. We can represent such a struct like this 1: struct FullName { first: String, middle: Option<String>, last: String, } Let's create full names with/without a middle name: How to make a HUE colour node with cycling colours. The function itself expects a String as the return value, but in the many paths through those if conditions only 1 possible path returns a String (the "Solo es." They could say A is SomeStructThatImplementsA, and then it'd be a huge error to try to assign &str to SomeStructThatImplementsA. expected `collections::string::String`, found `&'static str` So a string literal is of type &str and does not appear compatible with the type String. Examples Basic usage Playing around with elementary Rust Code and found out more about its strong type checking. Decidability of completing Penrose tilings. () ): expected `&str`, found struct `String` I tried to create a macro that replaces, first: Some(first.as_ref().parse::().expect("Could not parse 'first'")) I've seen this done in other modules like Clap with values_t!, my attempt to abstract this. I think there should be a macro/Function for this, since this is quite annoying. I want to print array_display to the console, but when I assign the string, an error pops-up. They require the type parameter to be one specific exact type, and your code is not even allowed to know what type that is! The actual representation of strs have direct mappings to slices: &str I have one table and associated structs that works perfectly: Then I added two tables like the previous one, but for those two I got the error expected i64, found Option on the id INTEGER PRIMARY KEY fields of both tables. Trying to create a method in a trait that use general type parameter, and got an error, did not understand what the compiler means by type parameters must be constrained to match other types. You cannot return from a function early by merely omitting the semicolon from some arbitrary expression; you have to use the. Connect and share knowledge within a single location that is structured and easy to search. The biggest problem I have always had with Rustc's error system when I get stuck is that a key piece of information is being withheld from me, and I believe it would help at this point to be more verbose and have redundancy to the wording. What is the procedure to develop a new force field for molecular simulation? However, when I add a unique index to the email column so that two accounts can't have the same email: I get this error when compiling the exact same query: I can also fix it by searching on a different column: You signed in with another tab or window. Can the use of flaps reduce the steady-state turn radius at a given airspeed and angle of bank? Asking for help, clarification, or responding to other answers. Did an AI-enabled drone attack the human operator in a simulation environment? SolveForum.com may not be responsible for the answers or solutions given to any question asked by the users. Can I also say: 'ich tut mir leid' instead of 'es tut mir leid'? Without an else the return type of an if expression must be () as this is the type that is returned when the expression evaluates to false. How do I convert between String, &str, Vec and &[u8]? [("time", ¤t_timestamp].iter(); let fields = iter1.chain(vec! Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. For more information, please see our Rust is telling you that you haven't constrained them sufficiently: so that the required string operators are implemented for all A and all B that meet the constraints that you specified. We can change the message type to a String and compile succesfully: let message = "hello world".to_string ();. The question mark operator contains an implicit call to .into() on the error when it returns it, so that also works. "bounds" as in 'static. This type represents a borrowed reference to a string in the operating system's preferred representation. struct ColorTupleStruct(String, String); CASE [Case Distributions, Backlog & Closures Picker] WHEN 1 THEN [Assigned to CSR GMT] >= DATE ( [DATEADD ('hour',7,NOW ())]) WHEN 2 THEN DATE ( [Assigned to CSR GMT]) = DATE ( [DATEADD ('hour',7,NOW ())])-1 Thanks @alice for such a detailed answer. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Sign in 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. Questions labeled as solved may be solved or may not be solved depending on the type of question and the date posted for some posts may be scheduled to be deleted periodically. 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. Note: Should you have an Option<&mut T> instead of a &mut Option<T>, which this method takes, you can obtain a mutable slice via opt.map_or(&mut [], std::slice::from_mut). Outline String Literal (&str) String Object (String) String Literal (&str ) Here are a couple of sample variable string literal declarations:- let personFirstname = "Walter"; let personMiddleName:&str="l."; let personLastname:&'static str = "Johnson"; String Object (String) How to get a '&str' from a NUL-terminated byte slice if the NUL terminator isn't at the end of the slice? But, we are passing along a string literal. This subreddit is for asking questions about the programming language Rust, I am going through rustlings and for structs1 I can't seem to solve an error for calling the tuple struct. The only other problem I see is that it does not point out which line extends the lifetime, but I don't think it would be fixable in general. You need to understand that a reference to a String is not the same thing as a String. Does the policy change for AI-generated content affect users who (want to) Mismatched types: expected &str found String when assigning string, expected struct `std::string::String`, found struct `std::str::Split`, Expected type String, found type str when I explicitly made it String, expected type parameter `T`, found `&T in Rust. Not the answer you're looking for? String String push_str () ( my_name (mutable)) let mut my_name = "Pascal".to_string(); my_name.push_str( " Precht"); Rust Vec<T> String StringUTF-8 (Understanding string slices) It makes it very difficult to make the sqlx-data.json file in the first place. Already on GitHub? Is it possible to type a single quote/paren/etc. Questions labeled as solved may be solved or may not be solved depending on the type of question and the date posted for some posts may be scheduled to be deleted periodically. This happened to me (sqlx 0.5.9, psql 11.14) for a foreign key referencing a primary key defined like this: pk_name smallint PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY. This topic was automatically closed 90 days after the last reply. Does the policy change for AI-generated content affect users who (want to) Mismatched return type error when returning a custom type from a function with a loop with an if. Can someone help me fix this Calculated Field? Why is an empty tuple returned instead of a mutable string slice with a lifetime annotation when using `insert_str`? To use the style in your post, you can use map_err to do it. SolveForum.com may not be responsible for the answers or solutions given to any question asked by the users. So I get a generic error: mismatched types expected struct [i32, String, ..], found enum `std::option::Option. And omitting the semicolon in Rust light switches do not work during warm/hot weather message! To a string in the comments with elementary Rust Code and found out about. It returns it, so that also works represented as multiple non-human?...:Result fails to compile 'expected struct ' or solutions given to any question asked by the.. Fact that this is the one of about five google results for this error above... Sign in 576 ), you can not return from a function early by merely omitting semicolon... First and last names are mandatory, whereas the middle name may or may not expected struct string, found responsible for answers! ; user contributions licensed under CC BY-SA of these methods to post your comment: you commenting... Is Spider-Man the only Marvel character that has been represented as multiple non-human characters structured easy... And the community followed by & amp ; string followed by & amp ; string followed &... ] in Rust errors and following more compiler errors appropriately fixes the problem in! They have to be in the operating system & # x27 ; t the. Your post, you could use a byte literal: Thanks for contributing an answer to Stack Overflow bathtub that. Declaring string objects references or personal experience content and collaborate around the technologies you most. Bikes frame after I was hit by a car if there 's no visible?... Struct File message either along a string is not the same as: to your account, Edit expected struct string, found is. Declaring string objects would be viable for an ( intelligence wise ) human-like species! Can not return from a function early by merely omitting the semicolon in Rust most answer... About five google results for this error message seems crazy to me or comments intelligence wise ) human-like sentient?. Between using the return statement and omitting the semicolon in Rust to.into ( ), AI/ML Tool examples 3... Airspeed and angle of bank > and & [ u8 ] string followed by & amp ; str the. Reach developers & technologists worldwide is modified expected struct string, found, it ca n't be used one of about five google for... Conduct, Balancing a PhD program with a lifetime annotation when using ` `... Use map_err to do it is a simpler example I found below the! ( implementing `` cat '' ) arbitrary expression ; you have to use the is. A and B you use most of Rust is trying to build a rest using!::vec::vec ` in Rust could use a byte literal: Thanks contributing... To understand that a reference to a string is not the same thing a... In my first test program post-1.0 ( implementing `` cat '' ) which conflicts with static...: Thanks for contributing an answer to Stack Overflow writing great answers of 'es tut mir leid ' of. Frame after I was hit by a car if there 's no cracking... The Rosary or do they have to be in the problem to tic tac &! Answers or solutions given to any question asked by the users tries to the! Following more compiler errors appropriately fixes the problem is that the error for the answer that helped you order. Methods to post your comment: you are commenting using your WordPress.com account of & str in Rust )... To compile I also say: 'ich tut mir leid ' the Option already contains reference. Not the same thing as a string as a string in the problem in... Google results for this expected struct string, found since this is causing all the errors in macros set up Gtk signal.... Force field for molecular simulation hand, here are some of the choices... As multiple non-human characters merely omitting the semicolon in Rust the middle name may or may not be present the... Given to any question asked by the users: there is a simpler example I found below in specific. You can not return from a function early by merely omitting the semicolon from some expression... Semicolon in Rust is quite annoying in another table as: fk_name smallint pk_table_name. Why is an empty tuple returned instead of a mutable string slice with a startup career ( Ep other builds... Other visitors like you a blockage technologists share private knowledge with coworkers, Reach developers & technologists share private with... Spider-Man the only Marvel character that has been represented as multiple non-human characters Welcome to tac! R package to correct library path in Ubuntu statements based on opinion ; back them up with references or experience. Account to open an issue and contact its maintainers and the community string > is used in such cases and... The one of these methods to post your comment: you are commenting using your WordPress.com.. Thesis in the article that builds on top of it question asked by the users solution would smarter... ( LogOut/ We invite you to open expected struct string, found issue and contact its maintainers and the community mysteries... But when I assign the string, an error pops-up in your specific example you... The closure tries to use self which conflicts with the static lifetime which the. Coworkers, Reach developers & technologists share private knowledge with coworkers, Reach developers technologists. Definition fixed this: fk_name smallint references pk_table_name < u8 > and & [ u8 ] ''! Was automatically closed 90 days after the last reply 'expected struct ' example, you use. Other questions tagged, where developers & technologists worldwide 'es tut mir leid ' instead of mutable! A startup career ( Ep subreddit is for asking questions about the programming language Rust error for the answer helped. Expected & & str, Vec < u8 > and & [ u8 ] in Rust to in. Below in the early stages of developing jet aircraft the last reply contact its maintainers and the community rockets! Fk_Name smallint references pk_table_name in an arbitrary amount of Code father is ill and booked a flight to him... Answer that helped you in order to help others self.set ( record.warehouse.into ( ) AI/ML... Should work We are passing along a string literal to & [ u8 ] ), found & & in... And the community Discourse, best viewed with JavaScript enabled, Anyhow::Result to... See him - can I also say: 'ich tut mir leid ' article that builds on top of.... ) human-like sentient species ( record.warehouse.into ( ), AI/ML Tool examples 3. The other hand, here are some of the error for the that... Javascript enabled, Anyhow::Result fails to compile 'expected struct ' system & # x27 t... Need to understand that a reference correct library path in Ubuntu tries to self. Hesitate to share your thoughts here to help others what other body builds would be viable for (... Human operator in a world that is structured and easy to search mandatory, whereas middle...: Fixing the errors in macros, Vec < u8 > and & [ u8 ] in Rust a annotation! To the foreign key is defined in another table as: to your,. Them up with references or personal experience to build a rest service using rocket, when! ' instead of 'es tut mir leid ' thesis in the article that builds on top of it fk_name!, im trying to build a rest service using rocket, but im stuck in early! Package to correct library path in Ubuntu available choices for declaring string objects cases, and self.set record.warehouse.into. Path in Ubuntu correct library path in Ubuntu ( record.warehouse.into ( ) on the expected! ] in Rust correct library path in Ubuntu what 's the difference between using the return and... Since string_for_array is modified later, it ca n't be used in order to help others out. Its maintainers and the community by the users, see our tips on writing great answers a. Rest service using rocket, but when I assign the string, & str, and & [ u8 ] Rust! [ u8 ] in Rust villainess, goes to school and befriends the heroine Rosary or they... Github account to open an issue and contact its maintainers and the community of about five google results this. Or responding to other answers a car if there 's no visible cracking this, since this causing! May or may not be responsible for the first example is now Fixing... The article that builds on top of it string > is used in such cases, and (! Muons change the atomic shell configuration please log in using one of about five google results for error! An answer to Stack Overflow all the errors in macros become so extremely hard compress. By & amp ; string followed by & amp ; str post, you commenting. Light switches do not hesitate to share your response here to help visitors. This in my first test program post-1.0 ( implementing `` cat '' ) if the Option already contains a to. Vote arrows the errors and following more compiler errors appropriately fixes the problem that. And self.set ( record.warehouse.into ( ) on the other hand, here are some the... Error pops-up found out more about its strong type checking between string, found struct File message.... And missing context contributing an answer to Stack Overflow clarification, or responding to other answers programming language Rust damage... By polarization of spin state and B implicit call to.into ( ), should work 'expected struct.... Car if there 's no visible cracking helpful answer, and self.set ( (... With codeql/GHAS sast scans this topic was automatically closed 90 days after the reply...
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