mirror of https://github.com/rust-lang/rust
43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
LL| |//@ edition: 2018
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LL| |
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LL| |macro_rules! bail {
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LL| | ($msg:literal $(,)?) => {
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LL| | if $msg.len() > 0 {
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LL| | println!("no msg");
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LL| | } else {
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LL| | println!($msg);
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LL| | }
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LL| | return Err(String::from($msg));
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LL| | };
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LL| |}
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LL| |
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LL| |macro_rules! on_error {
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LL| | ($value:expr, $error_message:expr) => {
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LL| 0| $value.or_else(|e| {
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LL| 0| // This closure, which is declared in a macro, should be instrumented.
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LL| 0| let message = format!($error_message, e);
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LL| 0| if message.len() > 0 {
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LL| 0| println!("{}", message);
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LL| 0| Ok(String::from("ok"))
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LL| | } else {
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LL| 0| bail!("error");
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LL| | }
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LL| 0| })
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LL| | };
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LL| |}
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LL| |
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LL| 1|fn load_configuration_files() -> Result<String, String> {
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LL| 1| Ok(String::from("config"))
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LL| 1|}
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LL| |
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LL| 1|pub fn main() -> Result<(), String> {
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LL| 1| println!("Starting service");
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LL| 1| let config = on_error!(load_configuration_files(), "Error loading configs: {}")?;
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^0
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LL| |
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LL| 1| let startup_delay_duration = String::from("arg");
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LL| 1| let _ = (config, startup_delay_duration);
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LL| 1| Ok(())
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LL| 1|}
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