Config option for cap_lints

src/config.rs

@@ -27,6 +27,8 @@ use crate::Result;
 #[derive(Debug, Default, Clone, Deserialize)]
 #[serde(default, deny_unknown_fields)]
 pub struct Config {
+    /// Pass `--cap-lints` to rustc.
+    pub cap_lints: bool,
     /// Generate these error values from functions returning Result.
     pub error_values: Vec<String>,
     /// Generate mutants from source files matching these globs.

src/main.rs

@@ -117,8 +117,8 @@ pub struct Args {
     baseline: BaselineStrategy,
 
     /// Turn off all rustc lints, so that denied warnings won't make mutants unviable.
-    #[arg(long, action = ArgAction::Set, default_value_t = false, help_heading = "Build")]
-    cap_lints: bool,
+    #[arg(long, action = ArgAction::Set, help_heading = "Build")]
+    cap_lints: Option<bool>,
 
     /// Print mutants that were caught by tests.
     #[arg(long, short = 'v', help_heading = "Output")]

src/options.rs

@@ -199,7 +199,7 @@ impl Options {
                 &config.additional_cargo_test_args,
             ),
             baseline: args.baseline,
-            cap_lints: args.cap_lints,
+            cap_lints: args.cap_lints.unwrap_or(config.cap_lints),
             check_only: args.check,
             colors: args.colors,
             emit_json: args.json,
@@ -274,6 +274,7 @@ mod test {
         let options = Options::new(&args, &Config::default()).unwrap();
         assert!(!options.check_only);
         assert_eq!(options.test_tool, TestTool::Cargo);
+        assert!(!options.cap_lints);
     }
 
     #[test]
@@ -362,16 +363,18 @@ mod test {
     }
 
     #[test]
-    fn test_tool_from_config() {
+    fn from_config() {
         let config = indoc! { r#"
             test_tool = "nextest"
+            cap_lints = true
         "#};
         let mut config_file = NamedTempFile::new().unwrap();
         config_file.write_all(config.as_bytes()).unwrap();
         let args = Args::parse_from(["mutants"]);
         let config = Config::read_file(config_file.path()).unwrap();
         let options = Options::new(&args, &config).unwrap();
         assert_eq!(options.test_tool, TestTool::Nextest);
+        assert!(options.cap_lints);
     }
 
     #[test]