rust import struct from another file

contents are in a file with the name of the module plus the .rs extension. This How I can mutate a struct's field from a method? The file inside the father folder should start with the line package father as it belongs to the father package. Ackermann Function without Recursion or Stack. Can the Spiritual Weapon spell be used as cover? Syntax: To learn more, see our tips on writing great answers. A macro like this could help alleviate some of the boilerplate if you actually have several modules like db that you want to keep separate: Again, I think that most of the time one should prefer just using the derive as opposed to either of the two above options, but if you really have hard requirements for decoupling here, then those are the best options I can think of at the moment. To use a custom package we must import it first. Creates a new file and write bytes to it (you can also use write()): Read the contents of a file into a String (you can also use read): It can be more efficient to read the contents of a file with a buffered You will also be able to call functions of custom packages from the main package. Your file structure continues the same, and your code needs to be slightly changed: main.rs: mod hello; fn main () { hello::print_hello (); } hello.rs: It reduces naming conflicts. I've tried: which gives me error[E0583]: file not found for module 'rank'. In python/ruby, I'd just give the name of the module in an import/require . Additionally, many operating systems allow concurrent modification of files Commentdocument.getElementById("comment").setAttribute( "id", "a2b83287dc553f0c09fcaeac549e93ec" );document.getElementById("gd19b63e6e").setAttribute( "id", "comment" ); Save my name and email in this browser for the next time I comment. It gets expanded to the code that is in hello.rs (exactly as you had before). attributes on the underlying file. The above command will create a file named go.mod. An import declaration states that the source file containing the declaration depends on functionality of theimportedpackage (Program initialization and execution) and enables access toexportedidentifiers of that package. Asking for help, clarification, or responding to other answers. Once these are in place, the entire module tree is built and looks like this: Each module can refer to any other module in the tree much like you can use the filesystem: absolute paths begin with crate (which is like /), and relative paths begin with self (.) How do I access "private" struct's field from other files in Rust? In split.rs: // This declaration will look for a file named `my.rs` and will // insert its contents inside a . What are some tools or methods I can purchase to trace a water leak? Directories ( folders ) as sub-modules for libraries ) is automatically namespaced on a file Rosetta! This function will return an error if the file is not opened for writing. Then in my main.rs file I have called the sayHello() function as below: its a faily simple approach in solving this, you need to add mod into the main.rs file, for its to be accessible throughout the file tree. How to handle multi-collinearity when all the variables are highly correlated? Flush this output stream, ensuring that all intermediately buffered What has meta-philosophy to say about the (presumably) philosophical work of non professional philosophers? other handle: Changes the permissions on the underlying file. To understand how and why this works read the first comment under my question. Note that this method alters the content of the underlying file, even Item* This function returns a new OpenOptions object that you can use to How to disable unused code warnings in Rust? Story Identification: Nanomachines Building Cities. Has Microsoft lowered its Windows 11 eligibility criteria? Link here: . main.rs will need to have a mod service; statement; service.rs will need a mod device; statement, and service/device.rs will need mod device; and a mod watch; statements. Note that this method alters the permissions of the underlying file, While the coupling may not be that tight, the way I understand the idea of that pattern is that each layer need to keep it's integrity and not bleed into it's adjacencies. Seeks to a given position and writes a number of bytes. The key is to use the word super:: for the include. Pushing further on things like decoupling than you might in a purely practical scenario, as a learning exercise makes sense. This function will return an error if the user lacks permission change Rust works with modules, as part of a module tree. Pull some bytes from this source into the specified buffer, returning are all other module files. more of the timestamps set in the FileTimes structure. sync_all. Avoid assuming that holding a &File means that the retrieving the underlying OS object and modifying the file that way. How to include files in Rust. Powered by Discourse, best viewed with JavaScript enabled. We invite you to open a new topic if you have further questions or comments. This function may return an error if the operating system lacks support to change one or I've come to a roadblock, and stack overflow and the rust subreddit didn't answer my question. Creates an adapter which will read at most. Late Question wouldn't it also work if I specify it with use hello instead of mod hello?! I intended to include numerous sub-directories as well, as I reckoned it might add incidental information to those likely having the same knowledge as I in Rust. still modify the file, either through methods that take &File or by in with 0s. may change in the future. Not the answer you're looking for? perform synchronous I/O operations. rev2023.3.1.43269. }. This isn't the right answer. We define 2 struct in helper package: Student and Class struct: If we want to use Class or Student struct in main.go, you have to copy those two struct from helper package or simpler, import it. In particular, if the cursor was at the Returns the current position within the file. Every Go source file belongs to a package. Most importantly, PyFloat and PyFrozenSet give the following: Job 1, 'python3 test.py' terminated by signal SIGSEGV (Address boundary error) Cargo.toml. Perform a quick search across GoLinuxCloud. How to reference private types from public functions in private modules? Many kernel subsystems need to take `struct device` pointers. I am trying to access a pub struct inside src/components/header.rs in src/pages/homepage.rs. This post will show example for importing struct from different module. This can be used to handle errors that would otherwise only be caught have been opened for asynchronous I/O (e.g. They allow us to easily reuse code, such as when we want to use a struct from another package or file. For those above advantages, sometimes we have to import struct from another package and file rather than copy the entire code. How did Dominion legally obtain text messages from Fox News hosts? Another relatively ugly option, that preserves that models does not depend on db is to use separate structs which have the derives placed on them, and then to provide conversions back and forth. Not the answer you're looking for? What's the de-facto way of reading and writing files in Rust 1.x? models.rs above), which would then break the project-structure I wish to keep and polluting my "core logic" with library specific code. Powershell prints out Rust compiler's beautiful and informative error printing: I placed "" quotation marks in the title for "private" because I'm not certain whether that word is still applicable with the term I'm trying to convey with my posted solution. will be returned if the desired length would cause an overflow due to This means that the crate::service::device::watch module is only visible within the crate::service::device subtree, including crate::service::device::device, but not in crate::service or in crate. To learn more, see our tips on writing great answers. Write a buffer into this writer, returning how many bytes were written. Launching the CI/CD and R Collectives and community editing features for How can I access command line parameters in Rust? Blue are names of your choosing, black are names that have to be used verbatim by convention. The code in main.rs is declaring that those modules exist, and that they exist within the main module. The module crate::service::device::device can reach the module crate::service::device::watch by using either the long form use crate::service::device::watch;, or the much shorter and clearer use super::watch; These use statements make the watch module available under its own name, so functions in it would be used as watch::some_function(). Press question mark to learn the rest of the keyboard shortcuts. Read all bytes until EOF in this source, placing them into, Read all bytes until EOF in this source, appending them to, Read the exact number of bytes required to fill, Creates a by reference adaptor for this instance of. @LukasKalbertodt, Thanks a lot! For example, almost all the code that we have seen so far in thistutorial series includes the fmt package: Package fmt implements formatted I/O with functions analogous to C's printf and scanf. Partner is not responding when their writing is needed in European project application. unsafe? race condition / attack). But I had trouble accessing a struct's field/data member from another file. and they all fail with different error messages. ". following code snippet would use the paths shown based on where it is located: For path attributes inside inline module blocks, the relative location of Youre certainly not too dumb. PyBool and PySlice, which gives this error: TypeError: type 'bool' (or 'slice') is not an acceptable base type. Thanks haven't come across that one before. This function will attempt to ensure that all in-memory data reaches the Fields that start with LOWER CASE characters are package internal and not exposed, If you want to reference the field from another package it needs to start with an UPPER CASE character. I'm a beginner at rust and haven't really wrapped my head around macros - but I'm thinking the structs could be a good candidate for a macro that generates them and derives the required traits for them? If we only define pub struct, and not for the field, the field will be automatically be private. The first patch in this series just adds a private Sealed trait . SOLVED - Thanks to u/Erelde--EDIT: Got a good respoonse at StackOverflow which I will copy in here. For path attributes inside inline module blocks, the relative location of the file path depends on the kind of source file the path attribute is located in. main.rs) and modules with files named mod.rs. From for U chooses to do. a module with nested children. shown based on where it is located: An example of combining the above rules of path attributes on inline modules It is encouraged to use the new naming One of the things that people struggle the most when starting to learn Rust is how to include modules, especially when they are deeply nested throughout the application. This post might help your understanding: Clear explanation of Rusts module system. If you want to pass a Python integer object into a PyO3 function and use it as a Rust-native big integer . The open-source game engine youve been waiting for: Godot (Ep. This function currently corresponds to the fchmod function on Unix and The unsafe keyword is syntactically allowed to appear before the mod made a post on SO, maybe with better description: https://stackoverflow.com/questions/63659395/rust-include-rust-module-in-another-directory, https://stackoverflow.com/questions/63659395/rust-include-rust-module-in-another-directory. In the main() function, we are now able to define the Father and Son struct using above alias. file will not change. . That approach isn't idiomatic Rust and I would advise against its use without a good explanation of what it accomplishes. The goal of this method is to reduce disk A C-based language programmer tends to import files to get the respective types or namespaces within one's scope. Changes the timestamps of the underlying file. be shrunk. ), TL;DR: move card.rs, rank.rs, suit.rs into a deck folder to import them as submodules of deck.rs. A module item introduces a new, named module into the tree of Notify me via e-mail if anyone answers my comment. Modules and types share the same namespace. path. It's describing a tree of modules, like a tree of folders and files. Making statements based on opinion; back them up with references or personal experience. Rust code: may change in the future. Pull some bytes from this source into the specified buffer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. or super ( ..) The module crate::service::device::device can reach the module crate::service::device::watch by using either the long form use crate::service . how many bytes were read. will be extended to size and have all of the intermediate data filled Modules can be mapped to a file/directory hierarchy. util/mod.rs. Wouldn't concatenating the result of two different hashing algorithms defeat all collisions? Making statements based on opinion; back them up with references or personal experience. Instead of This Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Define a public struct for all fields in the struct. Rust Import structure from another file [duplicate]. That's part of it, but the main point is not to restrict access, it's to clearly defined what can be used elsewhere. Module : by using FILE_FLAG_OVERLAPPED). and will truncate it if it does. As a Rust newbie, it's a bit disturbing that such a simple concept (importing other bits of code) requires so much research. Files also implement Seek to alter the logical cursor The idiomatic alternative is to name the file the name of the module: You need to put a mod.rs file inside your folder of the same name as your module. Attempts to open a file in read-only mode. os-specific unspecified cases. Create a file father.go inside the father folder. For path attributes on modules not inside inline module blocks, the file You can use a whole bunch of Rust keywords to navigate between the modules of your crate: super::components::Header // `super` is like a `parent` of your current mod crate::components::Header // `crate` is like a root of you current crate And to include submodules of current mod . of the interfaces for Read and Write, the holder of a &File can mod IDENTIFIER ; I'd like to define a module with the models my application use are defined, and where there is no dependency on any third party crate. How did Dominion legally obtain text messages from Fox News hosts? as the existing File instance. It is equivalent to OpenOptions::new(), but allows you to write more What's wrong with my argument? How does the NLT translate in Romans 8:2? // some_model.rs // This feels icky pub struct SomeStruct { pub name: String, pub id: u32, } Just so other files could access the aforementioned struct above. Why can't I import module from different file in same directory? Files are automatically closed when they go out of scope. even though it takes &self rather than &mut self. This isn't a direct answer to your questions, because it doesn't actually explain how to mount the sub-modules into your crate (with mod) and how to expose functions to other modules (with pub), but that is (IMO) sufficiently explained in the book. You can select visibility with the pub or pub(crate) or pub(some::ancestor) modifiers to the module declaration as you so choose. I just had to use use crate::preset::Preset. Strange behavior of tikz-cd with remember picture. Modules tend to trip people up when starting out. Okay, so modules have a belongs to relationship, then? The core may remain wholly untouched by a change of ORM or web-framework. See the OpenOptions::open function for more details. In python/ruby, I'd just give the name of the module in an import/require, but I can't seem to satisfy the rust compiler. Items brought into scope with use also have This is a nightly-only experimental API. Is there a way to derive traits for a structure subsequent to the definition of the structure and within another file - In a similar way as manual implementations, but without having to write out all of the boilerplate code? Reddit and its partners use cookies and similar technologies to provide you with a better experience. By default, modules are not visible outside of their parent. An object providing access to an open file on the filesystem. But I had trouble accessing a struct's field/data member from another file. Dot product of vector with camera's local positive x-axis? Reader. Story Identification: Nanomachines Building Cities. Depending on the platform, this function may fail if the The above example can readable code. A package is simply a directory within your Go workspace that contains one or more Go source files or other Go packages. on closing are ignored by the implementation of Drop. The following will be the contents of the file. I think I'm too dumb to use Rust because I can't figure out how to call a function from another file. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This is an alias for set_times(FileTimes::new().set_modified(time)). Paths for path attributes inside inline module If we do not use importing package/file and copy the struct, when the struct is changed, you have to modify all the defined struct, which is a waste of time and may cause . At first glance it was confusing for me, and for the others like me who might be perplexed as well, I had posted my findings with a sample code. How to use one module from another module in a Rust cargo project? Launching the CI/CD and R Collectives and community editing features for How do I "use" or import a local Rust file? For example, we have a project with below structure: There are 2 package: helper and main. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Hi there! I really like Gardener's response. Consumes this object, returning the raw underlying file descriptor. Adjust the flags associated with this file. Golang Programs is designed to help beginner programmers who want to learn web development technologies, or start a career in website development. This is why I made this cheat sheet for myself. Remember: first build a module tree (no cycles!) Files are automatically closed when they go out of scope. For the arguments, we just need to include all the directories that may contain header files . How can I include a module from another file from the same project? See the OpenOptions::open method for more details. Creates a by reference adapter for this instance of. "non-mod-rs" source files are all other module files.Paths for path attributes inside inline module blocks in a mod-rs file are . rev2023.3.1.43269. As advised by my lead programmer, who's not knowledgeable in Rust but knows a lot about OO languages like Java, C#, and such, I should separate the functions and associated methods of a particular "class," in Rust it's more or less a struct, from its model or definition to another file. encountered. Pointer back into a C array, and tricks syntax extension to JSON designed . mod.rs within a project. Provide file advisory information on a file descriptor. exists and creating a new one, the file may have been created by another process (a TOCTOU Let's break down the visibility example in files: $ tree . My source code is here. The type returned in the event of a conversion error. If you havent seen it already, the little book of rust macros is a good resource on the topic. macro. If that pattern is kept, then the "core/domain/business logic" and it's implementation in the http-api or database model-classes may all be within different crates. I believe your question is answered by this Q&A. Just so other files could access the aforementioned struct above. So, at the top of nested.rs, add the following: I'm not sure the 2018 way of naming the file after the directory is more idiomatic. I'll give this a try and let you know. They actually take the type definition as their input before any identifiers are resolved, so that's unlikely to change any time soon. Basically I want to import into my deck.rs the files card.rs, rank.rs, and suit.rs (which each contain a struct of the same name). See the references below the post. So by importing card, rank, and suit inside of deck, they now belong to deck? Modules can nest arbitrarily. Find centralized, trusted content and collaborate around the technologies you use most. rust use struct from another file To open a text-file on your C: drive, you can use extern crate open; fn main () { open::that ("C:\textfile.txt"); } . There is no such thing as file imports. synchronize file metadata to the filesystem. In helper package, we define some helper classes and structs. How can a Rust program access metadata from its Cargo package? is there a chinese version of ex. Derive traits for a struct defined in another file. Import in Go is very important because it helps bring the packages which are super essential to run programs. How do I use a macro across module files? the syntax and make use of the unsafe keyword, before removing it from the with mod statements, then import names into scope via use (cycles . Project structure in rust -- adding extra files. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, If this is for an assignment, fine, but this is very much, In C++, you would have the data definition in the, I suspect that there's a misunderstanding between you and the lead. The open-source game engine youve been waiting for: Godot (Ep. I must be missing something really simple here, because it seems like importing a file from another file is about the second thing you'd do in a new language. Your main.rs can have mod foo; statements that import the code in ./foo.rs or ./foo/mod.rs. synchronizing this in-memory data. The directories and files used for loading external file modules can be RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? It may also return an error in other os-specific unspecified cases. Code in any file but the crate root (main.rs for executables, lib.rs for libraries) is automatically namespaced in a module. As others mentioned, Java and C# most definitely put the methods and the data in the same file (because they're part of the same class definition). If we change the elements name, notice the lowercase, L was changed to l for lecturer and S to s in studentCount: When compile main.go, the output will be: In this article, I demonstrated how to use package and import to organize source code in Golang. Consumes this object, returning the raw underlying handle. no_implicit_prelude. contents reach their destination. To include the code from hello.rs in your main.rs, use mod hello;. Thanks for that link, that was super helpful and I wish I'd read that earlier into my rust journey. https://go.dev/ref/spec#Packages Think of the pub keyword as a positive trait that's added and not as something that needs removing where possible. Student 1: {Anna Cody 20}, .\main.go:12:3: unknown field 'lecturer' in struct literal of type helper.Class How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Hey all, I'm working on programming a card game as a learn rust project. This seems quite straight forward if implementing traits manually, like: Alot of the libraries I use provide handy derives that I can use to implement most traits - But I only know how to do this in the same file where the model is defined (i.e. The open-source game engine youve been waiting for: Godot (Ep. my inaccessible.rs nested.rs my.rs split.rs. You can export a member defined in your package to other packages or keep it private to the same package. @ChristianSchmitt No, they are different things. Proper way to use rust structs from other mods. keyword, but it is rejected at a semantic level. Why did the Soviets not shoot down US spy satellites during the Cold War? I for one prefer the old approach for a clean directory tree, and plenty of crates also follow it. Thanks for contributing an answer to Stack Overflow! sync_all if these errors must be manually handled. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. In with 0s in helper package, we are now able to define father. Of modules, as a Rust-native big integer, Hi There a good respoonse at StackOverflow I... Its use without a good respoonse at StackOverflow which I will copy in here, privacy and! Be mapped to a given position and writes a number of bytes pointer back into a C,! As it belongs to the same project this cheat sheet for myself it may return! Question is answered by this Q & amp ; a, clarification or... Module plus the.rs extension items brought into scope with use hello instead of this why... Got a good respoonse at StackOverflow which I will copy in here raw underlying handle to a given position writes. Its use without a good resource on the platform, this function will return an if! File on the topic following will be the contents of the intermediate filled... Learn web development technologies, or start a career in website development integer object into a array. Example for importing struct from different module structure: There are 2 package: helper and main it private the. Dragons an attack answers my comment in src/pages/homepage.rs pub struct inside src/components/header.rs in src/pages/homepage.rs example can readable.. For this instance of conversion error are 2 package: helper and.. Packages or keep it private to the code in main.rs is declaring those... Event of a module item introduces a new, named module into the specified buffer from... Self rather than copy the entire code Fox News hosts on things like decoupling than you might in Rust... If anyone answers my comment ` struct device ` pointers the permissions on the topic self rather than the... As sub-modules for libraries ) is automatically namespaced on a file with the name of the file not. Is simply a directory within your Go workspace that contains one or more Go source files or other packages... Go workspace that contains one or more Go source files or other packages. Spiritual Weapon spell be used as cover packages which are super essential to Programs... That those modules exist, and suit inside of deck, they now belong to?. I & # x27 ; s describing a tree of modules, part... You have further questions or comments ) as sub-modules for libraries ) is automatically namespaced in a purely scenario. Named ` my.rs ` and will // insert its contents inside a is an alias set_times... That import the code that is in hello.rs ( exactly as rust import struct from another file had before.. Kernel subsystems need to take ` struct device ` pointers outside of their parent above alias a good at... New, named module into the specified buffer private Sealed trait more 's. What rust import struct from another file wrong with my argument and use it as a Rust-native big integer Sealed trait algorithms all! Of a conversion error to JSON designed help your understanding: Clear explanation of what accomplishes. Many kernel subsystems need to take ` struct device ` pointers // insert its contents inside a different hashing defeat! Any identifiers are resolved, so that 's unlikely to change any time soon old approach for a &... Start a career in website development cargo project packages or keep it private to father. Experimental API s describing a tree of Notify me via e-mail if anyone answers my.. A local Rust file believe your question is answered by this Q & amp ; a use have... 'Rank ' describing a tree of folders and files accessing a struct 's field/data member another... Either through methods that take & file or by in with 0s father should. Private '' struct 's field/data member from another package or file underlying file directories that may contain header.... Notify me via e-mail if anyone answers my comment be automatically be private [ E0583 ] file. Allow us to easily reuse code, such as when we want to use one module from file. Use the word super:: for the field will be the of! As their input before any identifiers are resolved, so modules have a to! Me via e-mail if anyone answers my comment by a change of or! To our terms of service, privacy policy and cookie policy be caught have been opened for.. A function from another file [ duplicate ] for that link, that super. Include a module file named ` my.rs ` and will // insert its contents inside.... Go workspace that contains one or more Go source files or other Go packages arguments we! There are 2 package: helper and main ; s field/data member from another package and file than... This works read the first patch in this series just adds a Sealed... That take & file means that the retrieving the underlying file file, either through methods that take & means. Struct device ` pointers mutate a struct 's field/data member from another package or file on things decoupling. But allows you to write more what 's wrong with my argument by. Hello? ; s field/data member from another package and file rather than & mut self a local file! R Collectives and community editing features for how can I include a module in... Spiritual Weapon spell be used verbatim by convention to import struct from another file object. To open a new topic if you havent seen it already, the little book Rust! That link, that was super helpful and I would advise against use! Rust macros is a good resource on the topic module item introduces a new, named module into the buffer! New topic if you want to pass a Python integer object into a folder... The struct variables are highly correlated automatically be private your understanding: Clear explanation of what it.. The name of the file, either through methods that take & file means the... Directory within your Go workspace that contains one or more Go source or! Field will be automatically be private see our tips on writing great answers other Go packages with. Main ( ) function, we just need to include the code that is in hello.rs exactly... ) ) seeks to a given position and writes a number of.! C array, and suit inside of deck, they now belong to deck it takes & self rather &! I use a macro across module files import a local Rust file anyone answers my.... Nightly-Only experimental API is equivalent to OpenOptions::open method for more details to do when out! Remain wholly untouched by a change of ORM or web-framework any time soon result of different. Are some tools or methods I can purchase to trace a water leak.set_modified ( time )... More, see our tips on writing great answers the Cold War e-mail anyone! Good explanation of what it accomplishes keyword, but it is rejected at semantic... Not found for module 'rank ' learn Rust project to run Programs main.rs, mod... It as a learning exercise makes sense partner is not opened for writing of module... Soviets not shoot down us spy satellites during the Cold War shoot down us spy satellites the! It may also return an error in other os-specific unspecified cases from file! Is automatically namespaced in a file named ` my.rs ` and will // insert contents. For example, we define some helper classes and structs mark to learn more, see tips. Openoptions::open method for more details which gives me error [ E0583 ]: file not found module! Not opened for asynchronous I/O ( e.g will return an error if the the above example can readable.! Was at the Returns the current position within the main module waiting for: Godot ( Ep experimental. The permissions on the platform, this function will return an error if file. Function for more details namespaced in a module from another file can mutate a struct defined in your can. Consumes this object, returning are all other module files been opened for writing Rust project... It with use hello instead of mod hello? in hello.rs ( exactly as you had before.... ` struct device ` pointers help your understanding: Clear explanation of what it accomplishes the timestamps set the. Or import a local Rust file scenario, as a learning exercise makes sense web development,. Rust program access metadata from its cargo package card, rank, and they! File inside the father folder should start with the name of the intermediate data filled modules can mapped. Private knowledge with coworkers, Reach developers & technologists worldwide, Hi!. Decoupling than you might in a purely practical scenario, as part of a module introduces... Alias for set_times ( FileTimes::new ( ), rust import struct from another file ; DR: move card.rs, rank.rs suit.rs! With JavaScript enabled unlikely to change any time soon defined in another file mod foo ; statements that import rust import struct from another file! Similar technologies to provide you with a better experience filled modules can be mapped to a hierarchy! Syntax: to learn more, see our tips on writing great answers in your package to other answers all. Integer object into a C array, and that they exist within file. & file means that the retrieving the underlying OS object and modifying the file that.... Split.Rs: // this declaration will look for a file Rosetta to take ` struct device pointers... Your package to other packages or keep it private to the code from hello.rs in your main.rs have.

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