---
source: einstellung_derive/src/test.rs
expression: formatted
---
/// --- input ---
#[derive(Config)]
struct ServerConfig {
host: String,
port: u16,
#[config(merge = "foo")]
is_active: bool,
}
/// --- output ---
::core::compile_error! {
"Unknown value: `foo`. Available values: `extend`, `function`, `replace`"
}