mirror of https://github.com/rust-lang/rust
41 lines
1.0 KiB
Rust
41 lines
1.0 KiB
Rust
//@ edition: 2018
|
|
|
|
macro_rules! bail {
|
|
($msg:literal $(,)?) => {
|
|
if $msg.len() > 0 {
|
|
println!("no msg");
|
|
} else {
|
|
println!($msg);
|
|
}
|
|
return Err(String::from($msg));
|
|
};
|
|
}
|
|
|
|
macro_rules! on_error {
|
|
($value:expr, $error_message:expr) => {
|
|
$value.or_else(|e| {
|
|
// This closure, which is declared in a macro, should be instrumented.
|
|
let message = format!($error_message, e);
|
|
if message.len() > 0 {
|
|
println!("{}", message);
|
|
Ok(String::from("ok"))
|
|
} else {
|
|
bail!("error");
|
|
}
|
|
})
|
|
};
|
|
}
|
|
|
|
fn load_configuration_files() -> Result<String, String> {
|
|
Ok(String::from("config"))
|
|
}
|
|
|
|
pub fn main() -> Result<(), String> {
|
|
println!("Starting service");
|
|
let config = on_error!(load_configuration_files(), "Error loading configs: {}")?;
|
|
|
|
let startup_delay_duration = String::from("arg");
|
|
let _ = (config, startup_delay_duration);
|
|
Ok(())
|
|
}
|