refactor: use arg capture for TargetConfig construction

Author: weihanglo

src/cargo/util/config/target.rs

@@ -111,10 +111,10 @@ fn load_config_table(config: &Config, prefix: &str) -> CargoResult<TargetConfig>
     // because it causes serde to use `deserialize_map` which means the config
     // deserializer does not know which keys to deserialize, which means
     // environment variables would not work.
-    let runner: OptValue<PathAndArgs> = config.get(&format!("{}.runner", prefix))?;
-    let rustflags: OptValue<StringList> = config.get(&format!("{}.rustflags", prefix))?;
-    let rustdocflags: OptValue<StringList> = config.get(&format!("{}.rustdocflags", prefix))?;
-    let linker: OptValue<ConfigRelativePath> = config.get(&format!("{}.linker", prefix))?;
+    let runner: OptValue<PathAndArgs> = config.get(&format!("{prefix}.runner"))?;
+    let rustflags: OptValue<StringList> = config.get(&format!("{prefix}.rustflags"))?;
+    let rustdocflags: OptValue<StringList> = config.get(&format!("{prefix}.rustdocflags"))?;
+    let linker: OptValue<ConfigRelativePath> = config.get(&format!("{prefix}.linker"))?;
     // Links do not support environment variables.
     let target_key = ConfigKey::from_str(prefix);
     let links_overrides = match config.get_table(&target_key)? {