multi_validation/
multi_validation.rs

1// Copyright (C) 2026 Kan-Ru Chen <kanru@kanru.info>
2//
3// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
4
5use std::error::Error;
6
7use scoped_error::Many;
8use scoped_error::impl_context_error;
9
10impl_context_error!(ValidationError);
11
12impl ValidationError {
13    fn new(msg: &'static str) -> Self {
14        Self {
15            message: msg.into(),
16            source: None,
17            location: None,
18        }
19    }
20}
21
22struct UserInput {
23    name: String,
24    email: String,
25    age: u32,
26}
27
28fn validate_user(input: &UserInput) -> Result<(), Many> {
29    let mut errors = Vec::new();
30
31    if input.name.is_empty() {
32        errors.push(ValidationError::new("name is required"));
33    }
34    if input.email.is_empty() {
35        errors.push(ValidationError::new("email is required"));
36    }
37    if input.age < 18 {
38        errors.push(ValidationError::new("must be 18 or older"));
39    }
40
41    if errors.is_empty() {
42        Ok(())
43    } else {
44        Err(Many::from_errors("user validation failed", errors))
45    }
46}
47
48fn main() -> Result<(), Box<dyn Error>> {
49    validate_user(&UserInput {
50        name: "John".to_string(),
51        email: "".to_string(),
52        age: 14,
53    })?;
54    Ok(())
55}
multi_validation/multi_validation.rs

multi_validation/
multi_validation.rs
