prompt: Write a complete Rust program with `fn main()` that demonstrates pattern matching with `match` and `if let`. Include necessary imports. Output only code in ```rust code blocks.

code:
use std::io;
use std::io::prelude::*;

fn main() {
    println!("Enter a number: ");
    let mut line = String::new();
    io::stdin().read_line(&mut line)
       .expect("Failed to read line");
    let num: i32 = match line.trim().parse() {
        Ok(num) => num,
        Err(_) => {
            println!("Not a number!");
            return;
        }
    };

    let result = if let Ok(num) = line.trim().parse() {
        if num == 1 {
            println!("One");
        } else if num == 2 {

compile_error:
error[E0277]: can't compare `()` with `i32`
  --> src/main.rs:18:16
   |
18 |         if num == 1 {
   |                ^^ no implementation for `() == i32`
   |
   = help: the trait `PartialEq<i32>` is not implemented for `()`
   = help: the trait `PartialEq` is implemented for `()`
   = help: for that trait implementation, expected `()`, found `i32`

error[E0277]: can't compare `()` with `i32`
  --> src/main.rs:20:23
   |
20 |         } else if num == 2 {
   |                       ^^ no implementation for `() == i32`
   |
   = help: the trait `PartialEq<i32>` is not implemented for `()`
   = help: the trait `PartialEq` is implemented for `()`
   = help: for that trait implementation, expected `()`, found `i32`

error[E0277]: can't compare `()` with `i32`
  --> src/main.rs:22:23
   |
22 |         } else if num == 3 {
   |                       ^^ no implementation for `() == i32`
   |
   = help: the trait `PartialEq<i32>` is not implemented for `()`
   = help: the trait `PartialEq` i


prompt: Create a Rust program that generates UUIDs using the uuid crate. Include `fn main()` that generates and prints multiple UUIDs. Output only Rust code in ```rust code blocks.

code:
use uuid::Uuid;

fn main() {
    println!("v4: {:#}", Uuid::new_v4());
    println!("v5: {:#}", Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org"));
    println!("v5: {:#}", Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org").to_hyphenated().to_string());
    println!("v5: {:#}", Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org").to_hyphenated());
    println!("v5: {:#}", Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org").to_string());
}

error_type: other

compile_error:
error[E0599]: no function or associated item named `new_v5` found for struct `Uuid` in the current scope
   --> src/main.rs:5:32
    |
5   |     println!("v5: {:#}", Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org"));
    |                                ^^^^^^ function or associated item not found in `Uuid`
    |
note: if you're trying to build a new `Uuid` consider using one of the following associated functions:
      uuid::builder::<impl Uuid>::nil
      uuid::builder::<impl Uuid>::max
      uuid::builder::<impl Uuid>::from_fields
      uuid::builder::<impl Uuid>::from_fields_le
      and 11 others
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/uuid-1.18.1/src/builder.rs:72:5
    |
72  |     pub const fn nil() -> Self {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
98  |     pub const fn max() -> Self {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
122 |     pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^


prompt: Write a Rust program that uses chrono to parse a date string and format it differently. Include `fn main()` with example dates. Output only Rust code in ```rust code blocks.

code:
use chrono::prelude::*;
use chrono::format::PcDateTime;

fn main() {
    let date = Local.ymd(2020, 1, 1).and_hms(10, 11, 12);
    let date = Local.ymd(2020, 1, 1).and_hms_milli(10, 11, 12, 13);
    let date = Local.ymd(2020, 1, 1).and_hms_micro(10, 11, 12, 13, 14);
    let date = Local.ymd(2020, 1, 1).and_hms_nano(10, 11, 12, 13, 14, 15);

    println!("Local time: {}", date.format("%Y-%m-%d %H:%M:%S"));
    println!("Local time: {}", date.format("%Y-%m-%d %H:%M:%S%.f"));
    println!("Local ti

error_type: other

compile_error:
error[E0432]: unresolved import `chrono::format::PcDateTime`
 --> src/main.rs:2:5
  |
2 | use chrono::format::PcDateTime;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ no `PcDateTime` in `format`

warning: use of deprecated method `chrono::TimeZone::ymd`: use `with_ymd_and_hms()` instead
 --> src/main.rs:5:22
  |
5 |     let date = Local.ymd(2020, 1, 1).and_hms(10, 11, 12);
  |                      ^^^
  |
  = note: `#[warn(deprecated)]` on by default

warning: use of deprecated method `chrono::Date::<Tz>::and_hms`: Use and_hms_opt() instead
 --> src/main.rs:5:38
  |
5 |     let date = Local.ymd(2020, 1, 1).and_hms(10, 11, 12);
  |                                      ^^^^^^^

warning: use of deprecated method `chrono::TimeZone::ymd`: use `with_ymd_and_hms()` instead
 --> src/main.rs:6:22
  |
6 |     let date = Local.ymd(2020, 1, 1).and_hms_milli(10, 11, 12, 13);
  |                      ^^^

warning: use of deprecated method `chrono::Date::<Tz>::and_hms_milli`: Use and_hms_milli_opt() instead
 -


prompt: Write a Rust program that uses serde to serialize and deserialize a struct to JSON. Include `fn main()` and use serde_json. Output only Rust code in ```rust code blocks.

code:
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
struct MyStruct {
    a: i32,
    b: String,
}

fn main() {
    let s = MyStruct { a: 42, b: "hello".to_string() };

    let serialized = serde_json::to_string(&s).unwrap();
    println!("serialized = {}", serialized);

    let deserialized: MyStruct = serde_json::from_str(&serialized).unwrap();
    println!("deserialized = {:?}", deserialized);
}

compile_error:
error[E0277]: `MyStruct` doesn't implement `Debug`
  --> src/main.rs:16:37
   |
16 |     println!("deserialized = {:?}", deserialized);
   |                                     ^^^^^^^^^^^^ `MyStruct` cannot be formatted using `{:?}`
   |
   = help: the trait `Debug` is not implemented for `MyStruct`
   = note: add `#[derive(Debug)]` to `MyStruct` or manually `impl Debug for MyStruct`
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `MyStruct` with `#[derive(Debug)]`
   |
4  + #[derive(Debug)]
5  | struct MyStruct {
   |

For more information about this error, try `rustc --explain E0277`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Write only a single Rust source file (main.rs) with a `fn main() -> anyhow::Result<()>` that demonstrates basic anyhow error handling. Do not explain; output only Rust code wrapped in ```rust code blo

code:
use anyhow::{anyhow, Context, Result};
use std::path::PathBuf;

fn main() -> anyhow::Result<()> {
    let path = PathBuf::from("/tmp/file.txt");
    let file = std::fs::File::open(path).context("Failed to open file")?;
    let _ = file.read_to_string().context("Failed to read file")?;
    Ok(())
}

error_type: other

compile_error:
warning: unused imports: `Result` and `anyhow`
 --> src/main.rs:1:14
  |
1 | use anyhow::{anyhow, Context, Result};
  |              ^^^^^^           ^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0599]: no method named `read_to_string` found for struct `File` in the current scope
 --> src/main.rs:7:18
  |
7 |     let _ = file.read_to_string().context("Failed to read file")?;
  |                  ^^^^^^^^^^^^^^
 --> /rustc/f6e511eec7342f59a25f7c0534f1dbea00d01b14/library/std/src/io/mod.rs:904:8
  |
  = note: the method is available for `File` here
  |
  = help: items from traits can only be used if the trait is in scope
help: there is a method `read_to_end` with a similar name, but with different arguments
 --> /rustc/f6e511eec7342f59a25f7c0534f1dbea00d01b14/library/std/src/io/mod.rs:861:5
help: trait `Read` which provides `read_to_string` is implemented but not in scope; perhaps you want to import it
  |
1 + use std::io::Read;
  |

For more information about this


prompt: Write a Rust program that uses the rand crate to generate random numbers and select random items from a vector. Include `fn main()`. Output only Rust code in ```rust code blocks.

code:
use rand::prelude::*;

fn main() {
    let random_number = thread_rng().gen_range(1, 10);
    let mut random_numbers: Vec<u8> = Vec::new();

    for i in 0..random_number {
        random_numbers.push(i);
    }

    println!("Random number: {}", random_number);
    println!("Random numbers: {:?}", random_numbers);
}

compile_error:
error[E0277]: the trait bound `{integer}: SampleRange<_>` is not satisfied
   --> src/main.rs:4:48
    |
4   |     let random_number = thread_rng().gen_range(1, 10);
    |                                      --------- ^ the trait `SampleRange<_>` is not implemented for `{integer}`
    |                                      |
    |                                      required by a bound introduced by this call
    |
    = help: the following other types implement trait `SampleRange<T>`:
              RangeInclusive<T>
              std::ops::Range<T>
note: required by a bound in `gen_range`
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/rand-0.8.5/src/rng.rs:132:12
    |
129 |     fn gen_range<T, R>(&mut self, range: R) -> T
    |        --------- required by a bound in this associated function
...
132 |         R: SampleRange<T>
    |            ^^^^^^^^^^^^^^ required by this bound in `Rng::gen_range`

error[E0061]: this method takes 1 argument but 2 arguments


prompt: Define a newtype wrapper for [u8; 32] and implement FromStr and Display. Provide a small `fn main()` that parses and prints it. Output only Rust code in ```rust code blocks.

code:
use std::str::FromStr;
use std::fmt;

newtype MyVec([u8; 32]);

impl FromStr for MyVec {
    type Err = String;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let mut vec = [0; 32];
        if s.len()!= 32 {
            return Err("Input string is not 32 bytes long".to_string());
        }
        for (i, c) in s.chars().enumerate() {
            vec[i] = c as u8;
        }
        Ok(MyVec(vec))
    }
}

impl fmt::Display for MyVec {
    fn fmt(&self, f: &mut fmt::Formatter) -> f

compile_error:
error: expected one of `!` or `::`, found `MyVec`
 --> src/main.rs:4:9
  |
4 | newtype MyVec([u8; 32]);
  |         ^^^^^ expected one of `!` or `::`

error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Create a Rust program that generates UUIDs using the uuid crate. Include `fn main()` that generates and prints multiple UUIDs. Output only Rust code in ```rust code blocks.

code:
use uuid::Uuid;

fn main() {
    // Generate a random UUID
    let random_uuid = Uuid::new_v4();
    println!("{}", random_uuid);

    // Generate a random UUID with a specific version
    let random_uuid_v5 = Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org");
    println!("{}", random_uuid_v5);

    // Generate a random UUID with a specific version and namespace
    let random_uuid_v6 = Uuid::new_v6(Uuid::NAMESPACE_DNS);
    println!("{}", random_uuid_v6);

    // Generate a random

error_type: other

compile_error:
error[E0599]: no function or associated item named `new_v5` found for struct `Uuid` in the current scope
   --> src/main.rs:9:32
    |
9   |     let random_uuid_v5 = Uuid::new_v5(Uuid::NAMESPACE_DNS, "rust-lang.org");
    |                                ^^^^^^ function or associated item not found in `Uuid`
    |
note: if you're trying to build a new `Uuid` consider using one of the following associated functions:
      uuid::builder::<impl Uuid>::nil
      uuid::builder::<impl Uuid>::max
      uuid::builder::<impl Uuid>::from_fields
      uuid::builder::<impl Uuid>::from_fields_le
      and 11 others
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/uuid-1.18.1/src/builder.rs:72:5
    |
72  |     pub const fn nil() -> Self {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
98  |     pub const fn max() -> Self {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
122 |     pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^


prompt: Write a Rust program that uses chrono to parse a date string and format it differently. Include `fn main()` with example dates. Output only Rust code in ```rust code blocks.

code:
use chrono::{DateTime, Local};
use chrono::format::{Item, ParseResult, ParseWeekday, ParseYear};

fn parse_date(date: &str) -> Option<DateTime<Local>> {
    match date.parse::<Local>() {
        Ok(dt) => Some(dt),
        Err(_) => None,
    }
}

fn format_date(dt: &DateTime<Local>, format: &str) -> String {
    dt.format(format).to_string()
}

fn main() {
    // Example 1
    let date = "2022-08-12 11:12:13";
    let date = parse_date(date).unwrap();
    let formatted = format_date(&date, "%a

compile_error:
error[E0432]: unresolved imports `chrono::format::ParseWeekday`, `chrono::format::ParseYear`
 --> src/main.rs:2:41
  |
2 | use chrono::format::{Item, ParseResult, ParseWeekday, ParseYear};
  |                                         ^^^^^^^^^^^^  ^^^^^^^^^ no `ParseYear` in `format`
  |                                         |
  |                                         no `ParseWeekday` in `format`

warning: unused imports: `Item` and `ParseResult`
 --> src/main.rs:2:22
  |
2 | use chrono::format::{Item, ParseResult, ParseWeekday, ParseYear};
  |                      ^^^^  ^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0277]: the trait bound `Local: FromStr` is not satisfied
 --> src/main.rs:5:16
  |
5 |     match date.parse::<Local>() {
  |                ^^^^^ the trait `FromStr` is not implemented for `Local`
  |
  = help: the following other types implement trait `FromStr`:
            DateTime<FixedOffset>
            DateTime<Local>
            DateTi


prompt: Create a Rust program that generates UUIDs using the uuid crate. Include `fn main()` that generates and prints multiple UUIDs. Output only Rust code in ```rust code blocks.

code:
use uuid::Uuid;

fn main() {
    let random_uuid = Uuid::new_v4();
    println!("Random UUID: {}", random_uuid);

    let random_uuid = Uuid::new_v5(Uuid::NAMESPACE_DNS, "https://www.rust-lang.org/");
    println!("Random UUID: {}", random_uuid);

    let random_uuid = Uuid::new_v5(Uuid::NAMESPACE_DNS, "https://www.rust-lang.org");
    println!("Random UUID: {}", random_uuid);

    let random_uuid = Uuid::new_v5(Uuid::NAMESPACE_DNS, "https://www.rust-lang.org/");
    println!("Random UUID: {}",

error_type: other

compile_error:
error[E0599]: no function or associated item named `new_v5` found for struct `Uuid` in the current scope
   --> src/main.rs:7:29
    |
7   |     let random_uuid = Uuid::new_v5(Uuid::NAMESPACE_DNS, "https://www.rust-lang.org/");
    |                             ^^^^^^ function or associated item not found in `Uuid`
    |
note: if you're trying to build a new `Uuid` consider using one of the following associated functions:
      uuid::builder::<impl Uuid>::nil
      uuid::builder::<impl Uuid>::max
      uuid::builder::<impl Uuid>::from_fields
      uuid::builder::<impl Uuid>::from_fields_le
      and 11 others
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/uuid-1.18.1/src/builder.rs:72:5
    |
72  |     pub const fn nil() -> Self {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
98  |     pub const fn max() -> Self {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
122 |     pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
    |     ^^^^^^^^^^^^^^^^^^^


prompt: Write only Rust code for a program that uses iterators with map/filter to compute a sum. Include `fn main()` and necessary imports. No explanations. Wrap code in ```rust code blocks.

code:
use std::collections::HashMap;

fn main() {
    let mut map = HashMap::new();
    map.insert("a", 1);
    map.insert("b", 2);
    map.insert("c", 3);

    let total = map.values().filter(|v| **v > 1).map(|v| v + 1).sum();

    println!("total: {}", total);
}

error_type: other

compile_error:
error[E0283]: type annotations needed
 --> src/main.rs:9:9
  |
9 |     let total = map.values().filter(|v| **v > 1).map(|v| v + 1).sum();
  |         ^^^^^                                                   --- type must be known at this point
  |
  = note: cannot satisfy `_: Sum<i32>`
  = help: the following types implement trait `Sum<A>`:
            `Duration` implements `Sum<&'a Duration>`
            `Duration` implements `Sum`
            `Option<T>` implements `Sum<Option<U>>`
            `Result<T, E>` implements `Sum<Result<U, E>>`
            `Simd<f32, N>` implements `Sum<&'a Simd<f32, N>>`
            `Simd<f32, N>` implements `Sum`
            `Simd<f64, N>` implements `Sum<&'a Simd<f64, N>>`
            `Simd<f64, N>` implements `Sum`
          and 72 others
note: required by a bound in `std::iter::Iterator::sum`
 --> /rustc/f6e511eec7342f59a25f7c0534f1dbea00d01b14/library/core/src/iter/traits/iterator.rs:3572:5
help: consider giving `total` an explicit type
  |
9 |     le


prompt: Write a Rust program that uses chrono to parse a date string and format it differently. Include `fn main()` with example dates. Output only Rust code in ```rust code blocks.

code:
use chrono::{DateTime, Local, NaiveDateTime, Utc};

fn main() {
    let local_now = Local::now();
    let utc_now = Utc::now();
    let naive_now = NaiveDateTime::from_timestamp(0, 0);

    let local_now_str = local_now.to_rfc3339();
    let utc_now_str = utc_now.to_rfc3339();
    let naive_now_str = naive_now.to_rfc3339();

    println!("Local now:   {}", local_now_str);
    println!("UTC now:     {}", utc_now_str);
    println!("Naive now:   {}", naive_now_str);
}

error_type: other

compile_error:
warning: unused import: `DateTime`
 --> src/main.rs:1:14
  |
1 | use chrono::{DateTime, Local, NaiveDateTime, Utc};
  |              ^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: use of deprecated associated function `chrono::NaiveDateTime::from_timestamp`: use `DateTime::from_timestamp` instead
 --> src/main.rs:6:36
  |
6 |     let naive_now = NaiveDateTime::from_timestamp(0, 0);
  |                                    ^^^^^^^^^^^^^^
  |
  = note: `#[warn(deprecated)]` on by default

error[E0599]: no method named `to_rfc3339` found for struct `NaiveDateTime` in the current scope
  --> src/main.rs:10:35
   |
10 |     let naive_now_str = naive_now.to_rfc3339();
   |                                   ^^^^^^^^^^ method not found in `NaiveDateTime`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error; 2 warnings emitted


prompt: Write a Rust program that uses serde to serialize and deserialize a struct to JSON. Include `fn main()` and use serde_json. Output only Rust code in ```rust code blocks.

code:
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
struct Person {
    name: String,
    age: u8,
}

fn main() {
    let person = Person {
        name: "John".to_string(),
        age: 30,
    };

    let serialized = serde_json::to_string(&person).unwrap();
    println!("serialized person = {}", serialized);

    let deserialized: Person = serde_json::from_str(&serialized).unwrap();
    println!("deserialized person = {:?}", deserialized);
}

compile_error:
error[E0277]: `Person` doesn't implement `Debug`
  --> src/main.rs:19:44
   |
19 |     println!("deserialized person = {:?}", deserialized);
   |                                            ^^^^^^^^^^^^ `Person` cannot be formatted using `{:?}`
   |
   = help: the trait `Debug` is not implemented for `Person`
   = note: add `#[derive(Debug)]` to `Person` or manually `impl Debug for Person`
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `Person` with `#[derive(Debug)]`
   |
4  + #[derive(Debug)]
5  | struct Person {
   |

For more information about this error, try `rustc --explain E0277`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Write only a single Rust source file (main.rs) with a `fn main() -> anyhow::Result<()>` that demonstrates basic anyhow error handling. Do not explain; output only Rust code wrapped in ```rust code blo

code:
use anyhow::{bail, Context, Result};

fn main() -> Result<()> {
    let err = "Error".to_string();
    let err2 = "Another error".to_string();
    let res = "Result".to_string();

    match 1 + 1 {
        1 => bail!(err),
        _ => Ok(()),
    }?;

    Ok(())
}

error_type: other

compile_error:
warning: unused import: `Context`
 --> src/main.rs:1:20
  |
1 | use anyhow::{bail, Context, Result};
  |                    ^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0282]: type annotations needed
  --> src/main.rs:10:14
   |
10 |         _ => Ok(()),
   |              ^^ cannot infer type of the type parameter `E` declared on the enum `Result`
   |
help: consider specifying the generic arguments
   |
10 |         _ => Ok::<(), E>(()),
   |                +++++++++

error[E0283]: type annotations needed
  --> src/main.rs:10:14
   |
10 |         _ => Ok(()),
   |              ^^ cannot infer type of the type parameter `E` declared on the enum `Result`
11 |     }?;
   |      - type must be known at this point
   |
   = note: multiple `impl`s satisfying `anyhow::Error: From<_>` found in the following crates: `anyhow`, `core`:
           - impl<E> From<E> for anyhow::Error
             where E: std::error::Error, E: Send, E: Sync, E: 'static;
           - impl<T


prompt: Create a small example showing a thiserror enum, Display, a source cause, and a function using the ? operator. Include `fn main()` to drive it. Output only Rust code wrapped in ```rust code blocks.

code:
#[derive(thiserror::Error, Debug)]
enum MyError {
    #[error("error 1")]
    Error1,

    #[error("error 2")]
    Error2 {
        source: Box<dyn std::error::Error + Send + Sync +'static>,
    },
}

impl std::fmt::Display for MyError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Error1 => write!(f, "error 1"),
            Self::Error2 { source } => write!(f, "error 2: {}", source),
        }
    }
}

fn run() -> Result<(), MyE

compile_error:
error: expected `;`, found `Err`
  --> src/main.rs:28:7
   |
28 |     }?
   |       ^ help: add `;` here
29 |     Err(MyError::Error2 {
   |     --- unexpected token

error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `MyError`
  --> src/main.rs:1:10
   |
1  | #[derive(thiserror::Error, Debug)]
   |          ^^^^^^^^^^^^^^^^ conflicting implementation for `MyError`
...
12 | impl std::fmt::Display for MyError {
   | ---------------------------------- first implementation here
   |
   = note: this error originates in the derive macro `thiserror::Error` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0119`.
error: could not compile `template_app` (bin "template_app") due to 2 previous errors


prompt: Define a newtype wrapper for [u8; 32] and implement FromStr and Display. Provide a small `fn main()` that parses and prints it. Output only Rust code in ```rust code blocks.

code:
#[derive(Debug)]
struct Hash32([u8; 32]);

impl FromStr for Hash32 {
    type Err = &'static str;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if s.len()!= 32 {
            Err("Invalid hash length")
        } else {
            let mut bytes = [0u8; 32];
            for (i, byte) in bytes.iter_mut().enumerate() {
                *byte = s.as_bytes()[i].into();
            }
            Ok(Hash32(bytes))
        }
    }
}

impl std::fmt::Display for Hash32 {
    fn fmt(&self, f

compile_error:
error[E0405]: cannot find trait `FromStr` in this scope
 --> src/main.rs:4:6
  |
4 | impl FromStr for Hash32 {
  |      ^^^^^^^ not found in this scope
  |
help: consider importing this trait
  |
1 + use std::str::FromStr;
  |

For more information about this error, try `rustc --explain E0405`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Write a Rust program that uses chrono to parse a date string and format it differently. Include `fn main()` with example dates. Output only Rust code in ```rust code blocks.

code:
use chrono::{DateTime, DateTime, Local};
use chrono::format::PST;

fn main() {
    let date = "2021-04-01";
    let parsed_date: DateTime<Local> = DateTime::parse_from_rfc3339(date).unwrap();
    let formatted_date = parsed_date.with_timezone(&PST).format("%A, %B %e, %Y %r");
    println!("Date: {}", formatted_date);

    let date = "2021-03-01T12:00:00Z";
    let parsed_date: DateTime<Local> = DateTime::parse_from_rfc3339(date).unwrap();
    let formatted_date = parsed_date.with_timezone(&PST).

compile_error:
error[E0252]: the name `DateTime` is defined multiple times
 --> src/main.rs:1:24
  |
1 | use chrono::{DateTime, DateTime, Local};
  |              --------  ^^^^^^^^--
  |              |         |
  |              |         `DateTime` reimported here
  |              |         help: remove unnecessary import
  |              previous import of the type `DateTime` here
  |
  = note: `DateTime` must be defined only once in the type namespace of this module

error[E0432]: unresolved import `chrono::format::PST`
 --> src/main.rs:2:5
  |
2 | use chrono::format::PST;
  |     ^^^^^^^^^^^^^^^^^^^ no `PST` in `format`

warning: unused import: `DateTime`
 --> src/main.rs:1:24
  |
1 | use chrono::{DateTime, DateTime, Local};
  |                        ^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0308]: mismatched types
 --> src/main.rs:6:40
  |
6 |     let parsed_date: DateTime<Local> = DateTime::parse_from_rfc3339(date).unwrap();
  |                      --------------


prompt: Write a Rust program that uses serde to serialize and deserialize a struct to JSON. Include `fn main()` and use serde_json. Output only Rust code in ```rust code blocks.

code:
#[macro_use]
extern crate serde_derive;

#[macro_use]
extern crate serde_json;

use serde_json::Result;

#[derive(Serialize, Deserialize, Debug)]
struct Person {
    name: String,
    age: u8,
    occupation: String,
    salary: f64,
}

fn main() -> Result<()> {
    let person = Person {
        name: "John".to_string(),
        age: 30,
        occupation: "Software Developer".to_string(),
        salary: 60000.0,
    };

    let json = serde_json::to_string(&person)?;
    println!("JSON: {}",

compile_error:
error[E0463]: can't find crate for `serde_derive`
 --> src/main.rs:2:1
  |
2 | extern crate serde_derive;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error: cannot find derive macro `Serialize` in this scope
 --> src/main.rs:9:10
  |
9 | #[derive(Serialize, Deserialize, Debug)]
  |          ^^^^^^^^^
  |
help: consider importing this derive macro
  |
7 + use serde::Serialize;
  |

error: cannot find derive macro `Deserialize` in this scope
 --> src/main.rs:9:21
  |
9 | #[derive(Serialize, Deserialize, Debug)]
  |                     ^^^^^^^^^^^
  |
help: consider importing this derive macro
  |
7 + use serde::Deserialize;
  |

warning: unused `#[macro_use]` import
 --> src/main.rs:4:1
  |
4 | #[macro_use]
  | ^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0277]: the trait bound `Person: serde::Serialize` is not satisfied
    --> src/main.rs:25:38
     |
25   |     let json = serde_json::to_string(&person)?;
     |                --------------------- ^^


prompt: Write a complete Rust program with `fn main()` that demonstrates pattern matching with `match` and `if let`. Include necessary imports. Output only code in ```rust code blocks.

code:
use std::collections::HashMap;

fn main() {
    let some_map = Some(HashMap::new());

    // Pattern matching with `match`
    match some_map {
        Some(map) => {
            println!("Matched Some: {:?}", map);
        },
        None => {
            println!("Matched None");
        },
    }

    // Pattern matching with `if let`
    if let Some(map) = some_map {
        println!("if let matched Some: {:?}", map);
    } else {
        println!("if let matched None");
    }
}

error_type: other

compile_error:
error[E0282]: type annotations needed
 --> src/main.rs:4:25
  |
4 |     let some_map = Some(HashMap::new());
  |                         ^^^^^^^^^^^^ cannot infer type of the type parameter `K` declared on the struct `HashMap`
  |
help: consider specifying the generic arguments
  |
4 |     let some_map = Some(HashMap::<K, V>::new());
  |                                ++++++++

For more information about this error, try `rustc --explain E0282`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Write a Rust program that uses the rand crate to generate random numbers and select random items from a vector. Include `fn main()`. Output only Rust code in ```rust code blocks.

code:
use rand::prelude::*;
use rand::Rng;

fn main() {
    let mut rng = thread_rng();
    let mut random_number: u8 = rng.gen_range(1, 101);
    let mut random_number2: u8 = rng.gen_range(1, 101);
    let mut random_number3: u8 = rng.gen_range(1, 101);
    let mut random_number4: u8 = rng.gen_range(1, 101);

    let mut vec: Vec<u8> = Vec::new();
    vec.push(random_number);
    vec.push(random_number2);
    vec.push(random_number3);
    vec.push(random_number4);

    let random_item = rng.gen_range

compile_error:
error[E0277]: the trait bound `{integer}: SampleRange<_>` is not satisfied
   --> src/main.rs:6:47
    |
6   |     let mut random_number: u8 = rng.gen_range(1, 101);
    |                                     --------- ^ the trait `SampleRange<_>` is not implemented for `{integer}`
    |                                     |
    |                                     required by a bound introduced by this call
    |
    = help: the following other types implement trait `SampleRange<T>`:
              RangeInclusive<T>
              std::ops::Range<T>
note: required by a bound in `gen_range`
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/rand-0.8.5/src/rng.rs:132:12
    |
129 |     fn gen_range<T, R>(&mut self, range: R) -> T
    |        --------- required by a bound in this associated function
...
132 |         R: SampleRange<T>
    |            ^^^^^^^^^^^^^^ required by this bound in `Rng::gen_range`

error[E0061]: this method takes 1 argument but 2 arguments we


prompt: Create a small example showing a thiserror enum, Display, a source cause, and a function using the ? operator. Include `fn main()` to drive it. Output only Rust code wrapped in ```rust code blocks.

code:
use thiserror::Error;
use std::fmt;

#[derive(Error, Debug)]
enum MyError {
    #[error("invalid input")]
    InvalidInput,
    #[error("out of bounds")]
    OutOfBounds,
}

impl fmt::Display for MyError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}

fn process_input(input: &[u32]) -> Result<(), MyError> {
    let len = input.len();
    let idx = 2;

    if idx < len {
        Ok(())
    } else {
        Err(MyError::OutOfBounds)
    }
}

fn

error_type: other

compile_error:
error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `MyError`
  --> src/main.rs:4:10
   |
4  | #[derive(Error, Debug)]
   |          ^^^^^ conflicting implementation for `MyError`
...
12 | impl fmt::Display for MyError {
   | ----------------------------- first implementation here
   |
   = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0119`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Create a small example showing a thiserror enum, Display, a source cause, and a function using the ? operator. Include `fn main()` to drive it. Output only Rust code wrapped in ```rust code blocks.

code:
#[derive(thiserror::Error, Debug, Display)]
enum MyError {
    DivisionByZero,
    NegativeInput,
    StringEmpty,
}

impl From<std::num::TryFromIntError> for MyError {
    fn from(_: std::num::TryFromIntError) -> Self {
        MyError::DivisionByZero
    }
}

fn main() -> Result<(), MyError> {
    let result = try {
        let x = -1;
        let y = 0;
        if y == 0 {
            return Err(MyError::DivisionByZero);
        }
        Ok(x / y)
    } catch |e| {
        eprintln!("Error:

compile_error:
error: keyword `catch` cannot follow a `try` block
  --> src/main.rs:22:7
   |
22 |     } catch |e| {
   |       ^^^^^
   |
   = help: try using `match` on the result of the `try` block instead

error: cannot find derive macro `Display` in this scope
 --> src/main.rs:1:35
  |
1 | #[derive(thiserror::Error, Debug, Display)]
  |                                   ^^^^^^^

error[E0277]: `MyError` doesn't implement `std::fmt::Display`
 --> src/main.rs:2:6
  |
2 | enum MyError {
  |      ^^^^^^^ `MyError` cannot be formatted with the default formatter
  |
  = help: the trait `std::fmt::Display` is not implemented for `MyError`
  = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
note: required by a bound in `std::error::Error`
 --> /rustc/f6e511eec7342f59a25f7c0534f1dbea00d01b14/library/core/src/error.rs:29:1

For more information about this error, try `rustc --explain E0277`.
error: could not compile `template_app` (bin "template_app") due to 3 previ


prompt: Write only Rust code for a program that uses iterators with map/filter to compute a sum. Include `fn main()` and necessary imports. No explanations. Wrap code in ```rust code blocks.

code:
use std::iter;
use std::ops::RangeInclusive;

fn main() {
    let a: Vec<i32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    let b: Vec<i32> = (1..=10).collect();

    let sum_a: i32 = a.iter().filter(|&x| x % 2 == 0).sum();
    let sum_b: i32 = b.filter(|x| *x % 2 == 0).sum();

    assert_eq!(sum_a, sum_b);
}

error_type: other

compile_error:
warning: unused import: `std::iter`
 --> src/main.rs:1:5
  |
1 | use std::iter;
  |     ^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `std::ops::RangeInclusive`
 --> src/main.rs:2:5
  |
2 | use std::ops::RangeInclusive;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0599]: no method named `filter` found for struct `Vec<i32>` in the current scope
 --> src/main.rs:9:24
  |
9 |     let sum_b: i32 = b.filter(|x| *x % 2 == 0).sum();
  |                        ^^^^^^ `Vec<i32>` is not an iterator
  |
help: call `.into_iter()` first
  |
9 |     let sum_b: i32 = b.into_iter().filter(|x| *x % 2 == 0).sum();
  |                        ++++++++++++

For more information about this error, try `rustc --explain E0599`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error; 2 warnings emitted


prompt: Write a Rust program that uses serde to serialize and deserialize a struct to JSON. Include `fn main()` and use serde_json. Output only Rust code in ```rust code blocks.

code:
#[macro_use]
extern crate serde_derive;

use serde_json::{json, Value};

#[derive(Debug, Serialize, Deserialize)]
struct User {
    name: String,
    age: u8,
    email: String,
}

fn main() {
    let user = User {
        name: "John".to_string(),
        age: 30,
        email: "john@example.com".to_string(),
    };

    let json_user = serde_json::to_string(&user).unwrap();
    println!("JSON: {}", json_user);

    let user_deserialized: User = serde_json::from_str(&json_user).unwrap();
    p

compile_error:
error[E0463]: can't find crate for `serde_derive`
 --> src/main.rs:2:1
  |
2 | extern crate serde_derive;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error: cannot find derive macro `Serialize` in this scope
 --> src/main.rs:6:17
  |
6 | #[derive(Debug, Serialize, Deserialize)]
  |                 ^^^^^^^^^
  |
help: consider importing this derive macro
  |
4 + use serde::Serialize;
  |

error: cannot find derive macro `Deserialize` in this scope
 --> src/main.rs:6:28
  |
6 | #[derive(Debug, Serialize, Deserialize)]
  |                            ^^^^^^^^^^^
  |
help: consider importing this derive macro
  |
4 + use serde::Deserialize;
  |

warning: unused imports: `Value` and `json`
 --> src/main.rs:4:18
  |
4 | use serde_json::{json, Value};
  |                  ^^^^  ^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0277]: the trait bound `User: serde::Serialize` is not satisfied
    --> src/main.rs:20:43
     |
20   |     let json_user = serde_json::to_string


prompt: Create a Rust program with a struct, an impl block, and a trait implementation. Include `fn main()` to demonstrate usage. Output only code in ```rust code blocks.

code:
struct Point {
    x: i32,
    y: i32,
}

impl Point {
    fn new(x: i32, y: i32) -> Self {
        Self { x, y }
    }

    fn distance_from_origin(&self) -> f64 {
        (self.x.pow(2) + self.y.pow(2)).sqrt() as f64
    }
}

trait Colorful {
    fn color(&self) -> &'static str;
}

impl Colorful for Point {
    fn color(&self) -> &'static str {
        if self.distance_from_origin() < 5.0 {
            "red"
        } else {
            "blue"
        }
    }
}

fn main() {
    let p1 = Point:

error_type: other

compile_error:
error[E0599]: no method named `sqrt` found for type `i32` in the current scope
  --> src/main.rs:12:41
   |
12 |         (self.x.pow(2) + self.y.pow(2)).sqrt() as f64
   |                                         ^^^^ method not found in `i32`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error


prompt: Write a complete Rust program with `fn main()` that demonstrates pattern matching with `match` and `if let`. Include necessary imports. Output only code in ```rust code blocks.

code:
fn main() {
    let some_option: Option<String> = Some("hello".to_string());
    let none_option: Option<String> = None;
    let some_string = String::from("hello");

    // match
    match some_option {
        Some(value) => {
            println!("Got value: {}", value);
        }
        None => {
            println!("Got nothing");
        }
    }

    // if let
    if let Some(value) = some_option {
        println!("Got value: {}", value);
    } else {
        println!("Got nothing");

compile_error:
error[E0308]: mismatched types
  --> src/main.rs:32:9
   |
31 |     match some_string {
   |           ----------- this expression has type `String`
32 |         "hello" => {
   |         ^^^^^^^ expected `String`, found `&str`

error[E0308]: mismatched types
  --> src/main.rs:35:9
   |
31 |     match some_string {
   |           ----------- this expression has type `String`
...
35 |         "world" => {
   |         ^^^^^^^ expected `String`, found `&str`

error[E0308]: mismatched types
  --> src/main.rs:44:12
   |
44 |     if let "hello" = &some_string {
   |            ^^^^^^^   ------------ this expression has type `&String`
   |            |
   |            expected `&String`, found `&str`
   |
   = note: expected reference `&String`
              found reference `&'static str`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `template_app` (bin "template_app") due to 3 previous errors


prompt: Write a Rust program that uses serde to serialize and deserialize a struct to JSON. Include `fn main()` and use serde_json. Output only Rust code in ```rust code blocks.

code:
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
struct Person {
    name: String,
    age: u8,
}

fn main() {
    let person = Person {
        name: "John".to_string(),
        age: 30,
    };

    let serialized = serde_json::to_string(&person).unwrap();
    println!("serialized person = {}", serialized);

    let deserialized: Person = serde_json::from_str(&serialized).unwrap();
    println!("deserialized person = {:#?}", deserialized);
}

compile_error:
error[E0277]: `Person` doesn't implement `Debug`
  --> src/main.rs:19:45
   |
19 |     println!("deserialized person = {:#?}", deserialized);
   |                                             ^^^^^^^^^^^^ `Person` cannot be formatted using `{:?}`
   |
   = help: the trait `Debug` is not implemented for `Person`
   = note: add `#[derive(Debug)]` to `Person` or manually `impl Debug for Person`
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `Person` with `#[derive(Debug)]`
   |
4  + #[derive(Debug)]
5  | struct Person {
   |

For more information about this error, try `rustc --explain E0277`.
error: could not compile `template_app` (bin "template_app") due to 1 previous error