I'm having trouble with importing rand crate from crates.io. After adding the line rand="0.8.3" and then running command cargo build for the project, it keeps displaying the same errors:
error[E0432]: unresolved import `rand`
--> main.rs:1:5
|
1 | use rand::Rng;
| ^^^^ maybe a missing crate `rand`?
error[E0433]: failed to resolve: use of undeclared crate or module `rand`
--> main.rs:4:25
|
4 | let secret_number = rand::thread_rng().gen_range(1..=11);
| ^^^^ use of undeclared crate or module `rand`
error: aborting due to 2 previous errors
the cargo.toml file
[package]
name = "roller"
version = "0.1.0"
authors = ["User"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
rand = "0.8.3"
Basically the simplest reproducible example is this single line of code:
use rand::Rng;
fn main(){
let secret_number = rand::thread_rng().gen_range(1..=11);
print!("{}",secret_number);
}
What's wrong with it?
Just in case:
The **cargo.lock**file:
# This file is automatically #generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "cfg-if"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
[[package]]
name = "getrandom"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
dependencies = [
"cfg-if",
"libc",
"wasi",
]
[[package]]
name = "libc"
version = "0.2.86"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b7282d924be3275cec7f6756ff4121987bc6481325397dde6ba3e7802b1a8b1c"
[[package]]
name = "ppv-lite86"
version = "0.2.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
[[package]]
name = "rand"
version = "0.8.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0ef9e7e66b4468674bfcb0c81af8b7fa0bb154fa9f28eb840da5c447baeb8d7e"
dependencies = [
"libc",
"rand_chacha",
"rand_core",
"rand_hc",
]
[[package]]
name = "rand_chacha"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
dependencies = [
"ppv-lite86",
"rand_core",
]
[[package]]
name = "rand_core"
version = "0.6.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "34cf66eb183df1c5876e2dcf6b13d57340741e8dc255b48e40a26de954d06ae7"
dependencies = [
"getrandom",
]
[[package]]
name = "rand_hc"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3190ef7066a446f2e7f42e239d161e905420ccab01eb967c9eb27d21b2322a73"
dependencies = [
"rand_core",
]
[[package]]
name = "roller"
version = "0.1.0"
dependencies = [
"rand",
]
[[package]]
name = "wasi"
version = "0.10.2+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
In file Cargo.toml add lines:
[dependencies]
rand="0.3.14"
And rebuild project!
It worked with these versions:
rustc 1.53.0
cargo 1.53.0
Took answer from here https://github.com/rust-lang/rust/issues/34616
got the same error when I run it with vs code(rust-analyzer).
When you press the run button
rustic main.rs this command is called in terminal, it will cause error.
Type this in terminal,
cargo build
cargo run
It works well
If you think that you did everything right and get a strange unable to import error like this then you could try cargo clean.
That will allow you to fully re-build your binary/library after that.
Related
I am getting some dependencies version errors in rust.
I am fairly new to rust so I do not have any idea how to check for compatible updates between multiple dependencies.
It will be great if someone can resolve this issue and let me know how to manage dependencies.
Cargo.toml:
[package]
name = "chatbot"
version = "0.2.3"
authors = ["Joe Wilm <joe#jwilm.com>"]
license = "MIT"
description = "An extensible chatbot"
documentation = "https://docs.rs/chatbot"
repository = "https://github.com/jwilm/chatbot"
keywords = ["chat", "bot", "extensible"]
readme = "README.md"
[package.metadata.docs.rs]
all-features = true
[dependencies]
regex = "0.1"
rustc-serialize = "0.3"
getopts = "0.2"
irc = { version = "0.12", optional = true }
slack = { version = "0.18.0", optional = true }
[features]
default = []
irc-adapter = ["irc"]
slack-adapter = ["slack"]
I tried with versions suggested by VS Code but it did not work.
Error which I am getting after I do cargo-run is:
failed to select a version for the requirement `security-framework
= "^0.1.13"`
candidate versions found which didn't match: 2.8.2, 2.8.1, 2.8.0, ...
location searched: crates.io index
required by package `native-tls v0.1.2`
... which satisfies dependency `native-tls = "^0.1.2"` of package `tungstenite v0.2.0`
... which satisfies dependency `tungstenite = "^0.2.0"` of package `slack v0.18.0`
... which satisfies dependency `slack = "^0.18.0"` of package `chatbot v0.2.3
You are using old versions of the slack and irc crates. Both depend on an old version of native-tls (v0.1) in their dependency trees. native-tls v0.1 depends on a very old version of the security-framework crate (v0.1). All versions of security-framework v0.1 have been yanked from crates.io, see here: https://crates.io/crates/security-framework/versions. I assume this is due to a security issue in those versions. Because the v0.1 version of security-framework is yanked, you can't download it from crates.io anymore, causing the dependency error during compilation.
You can fix this by updating your irc and slack dependencies to their latest versions:
[package]
name = "chatbot"
version = "0.2.3"
authors = ["Joe Wilm <joe#jwilm.com>"]
license = "MIT"
description = "An extensible chatbot"
documentation = "https://docs.rs/chatbot"
repository = "https://github.com/jwilm/chatbot"
keywords = ["chat", "bot", "extensible"]
readme = "README.md"
[package.metadata.docs.rs]
all-features = true
[dependencies]
regex = "0.1"
rustc-serialize = "0.3"
getopts = "0.2"
irc = { version = "0.15", optional = true }
slack = { version = "0.25", optional = true }
[features]
default = []
irc-adapter = ["irc"]
slack-adapter = ["slack"]
Be aware that updating these dependencies is likely to break your code, since there are probably API changes in between your current and the latest version of these crates.
Just update your dependencies especially
[dependencies]
irc = { version = "0.15.0", optional = true }
slack = { version = "0.25.0", optional = true }
seem to be troublesome.
I am trying to integrate rust-gpu into a project. The docs explain how to use it as a build dependency but the examples use it as a straight dependency, I have struggled with both but I would prefer to get the dependency version to work as it's more suited for my purposes.
I downloaded the rust-gpu git repo and compiled the ash example, which runs.
This is the toml I used for compilation:
[package]
name = "example-runner-ash"
version = "0.0.0"
authors = ["Embark <opensource#embark-studios.com>"]
edition = "2021"
license = "MIT OR Apache-2.0"
publish = false
# See rustc_codegen_spirv/Cargo.toml for details on these features
[features]
default = ["use-compiled-tools"]
use-installed-tools = ["spirv-builder/use-installed-tools"]
use-compiled-tools = ["spirv-builder/use-compiled-tools"]
[dependencies]
ash = "0.35"
ash-window = "0.9"
winit = "0.26"
structopt = "0.3.20"
cfg-if = "1.0.0"
shared = { path = "../../shaders/shared" }
spirv-builder = { path = "../../../crates/spirv-builder", default-features = false }
# TODO: Remove this once no longer needed, only needed to make cargo-deny happy for some reason.
# https://rustsec.org/advisories/RUSTSEC-2021-0119
nix = "0.20.2"
[target.'cfg(target_os = "macos")'.dependencies]
ash-molten = { version = "0.12.0", features = ["pre-built"] }
So I thought if I did something similar on my own code it would work:
[package]
name = "vulkan_bindings"
version = "0.1.0"
edition = "2021"
[features]
default = ["use-compiled-tools"]
use-installed-tools = ["spirv-builder/use-installed-tools"]
use-compiled-tools = ["spirv-builder/use-compiled-tools"]
[dependencies]
ash = { version = "0.37.0" }
glfw = { version = "0.45.0", features = ["vulkan"] }
gpu-allocator = "0.18.0"
ash-window = "0.9"
winit = "0.26"
structopt = "0.3.20"
cfg-if = "1.0.0"
# shared = { path = "../../shaders/shared" }
spirv-builder = { path = "rust-gpu/crates/spirv-builder", default-features = false }
paste = "1.0.8"
termcolor = "1.1.3"
But this fails with a multiplicity of errors, the first of which is:
error[E0432]: unresolved import `rustc_codegen_ssa::METADATA_FILENAME`
--> /home/makogan/.cargo/git/checkouts/rust-gpu-e0a37a82a46176e6/8052971/crates/rustc_codegen_spirv/src/link.rs:9:52
|
9 | use rustc_codegen_ssa::{CodegenResults, NativeLib, METADATA_FILENAME};
| ^^^^^^^^^^^^^^^^^ no `METADATA_FILENAME` in the root
Not that I am pointing my project to the spirv-builder crate in the rust-gpu repo I downloaded, which worked for the ash example.
I also tried just following the instructions in the docs
So I declared spirv-builder as a build-dependency (using the git link) and I made a build.rs build script and copy pasted the snippet in the docs, as described.
I get the same error about missing METADATA_FILENAME.
I do have a rust-toolchain file setup just like the docs mentioned, and I tried switching the edition field in the toml to 2018, but I consistently get the same error.
I am nto sure what to do now.
I need to read client file in a rust-wasm program and I am trying two solution given on stackoverflow https://stackoverflow.com/a/51231915 and https://stackoverflow.com/a/69305956/4466255. Both these solutions are accepted and given bounties so I am assuming they work.
both of these have used following code
use stdweb::js_export
#[js_export]
But when i try to compile these codes I got following error
error[E0425]: cannot find function `__web_free` in module `stdweb::private`
--> src/lib.rs:14:1
|
14 | #[js_export]
| ^^^^^^^^^^^^ not found in `stdweb::private`
|
= note: this error originates in the attribute macro `js_export` (in Nightly builds, run with -Z macro-backtrace for more info)
What I am missing. How can we make it work?
My current code, which I have taken from stackoverflow https://stackoverflow.com/a/51231915, in lib.rs is
#[macro_use]
extern crate stdweb;
use stdweb::js_export;
use stdweb::web::FileReader;
use stdweb::web::FileReaderResult;
#[js_export]
fn print_result(file_reader: FileReader) -> String {
match file_reader.result() {
Some(value) => match value {
FileReaderResult::String(value) => value,
_ => String::from("not a text"),
}
None => String::from("empty")
}
}
pub fn test_reader() {
stdweb::initialize();
stdweb::event_loop();
}
and the Cargo.toml file is
[package]
name = "read-file2"
version = "0.1.0"
authors = ["kushdesh"]
edition = "2018"
[lib]
crate-type = ["cdylib", "rlib"]
[features]
default = ["console_error_panic_hook"]
[dependencies]
wasm-bindgen = "0.2.63"
stdweb = "0.4.20"
console_error_panic_hook = { version = "0.1.6", optional = true }
wee_alloc = { version = "0.4.5", optional = true }
[dev-dependencies]
wasm-bindgen-test = "0.3.13"
[profile.release]
# Tell `rustc` to optimize for small code size.
opt-level = "s"
In my Rust crate I need to be able to use 2 git repositories both checked out in the root of my crate. They are both modified and pkg_b requires an older version of pkg_a, 0.1.0. I can't seem to get pkg_b to use the newer version of pkg_a, 0.2.0. My current workaround has been to just update the Cargo.toml file in pkg_b.
My crate's Cargo.toml:
[package]
name = "mypkg"
version = "0.1.0"
[dependencies]
pkg_a = { path = "./pkg_a" } # This is 0.2.0 with my changes added
pkg_b = { path = "./pkg_b" }
[patch.crates-io]
pkg_a = { path = "./pkg_a", features = ["serde_support"] }
And pkg_b's Cargo.toml:
[package]
name = "pkg_b"
version = "0.1.0"
[dependencies]
pkg_a = { version = "0.1.0", features = ["serde_support"] }
If pkg_b requires pkg_a ^0.1.0 (meaning "between 0.1.0 and 0.2.0", see caret requirements in Cargo), you can't make it accept pkg_a 0.2.0 as a dependency, even if you patch the registry to make local pkg_a repository discoverable. Maintaining a patch for pkg_b/Cargo.toml seems like your best bet.
I try to build a project using rust-lang recently (this is my first rust project, and my boss is supporting me to use a new technology in my company). But, I suddenly get some red lines on my Cargo.toml :
could not compile `serde_derive`.
error: could not compile `async-trait`.
To learn more, run the command again with --verbose.
error: could not compile `rand_chacha`.
To learn more, run the command again with --verbose.
error: could not compile `proc-macro-hack`.
To learn more, run the command again with --verbose.
error: could not compile `diesel_derives`.
To learn more, run the command again with --verbose.
I run a command Cargo Run and my project is running well, but these red lines prevent me to tracking an error on my other code in my project (So if there is an error in code, it won't display as there are still exists some errors in another file, it is Cargo.toml)
I am using cargo 1.43.0-nightly (bda50510d 2020-03-02), rustc 1.43.0-nightly (c20d7eecb 2020-03-11), and vs code 1.43 version.
This is my Cargo.toml :
[package]
name = "app_base"
version = "0.1.0"
authors = ["yonathan"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
rocket = "0.4.3"
rocket_codegen = "0.4.3"
rocket_contrib = "0.4.3"
rocket_http = "0.4.3"
cookie = "0.11.2"
rocket-json-response = "0.5.10"
diesel = { version = "1.4.3", features = ["postgres"] }
dotenv = "0.15.0"
postgres = { version = "0.17.2", features = ["with-chrono-0_4"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
json-gettext = "3.1.7"
debug-helper = "0.3.8"
serializers = "0.2.3"
rocket_cors = { git = "https://github.com/lawliet89/rocket_cors", branch = "master" }
chrono = "0.4"
As this is an RLS (rust language server) bug [which is closed apparently, see here], a temporary alternative can be using the rust-analyzer extension [website here].
To install the extension, you can launch VSCode, click on the Extensions tab on the left and search for rust-analyzer in the Marketplace.
Please note that as mentioned on the website [as of 04/01/2020], this project is still in ALPHA, which means it may be prone to breakages.