feat: add --disable-builtin-rules

src/cli.rs

@@ -133,6 +133,9 @@ struct Cli {
     /// Add the test expectations at the given path
     ///
     /// (If not specified we'll look for a file called abi-cafe-rules.toml in the working dir)
+    ///
+    /// Note that there are already builtin rules (disabled with `--disable-builtin-riles`),
+    /// and it would be nice for rules to be upstreamed so everyone can benefit!
     #[clap(long)]
     rules: Option<Utf8PathBuf>,
 
@@ -142,6 +145,12 @@ struct Cli {
     #[clap(long)]
     disable_builtin_tests: bool,
 
+    /// disable the builtin rules
+    ///
+    /// See also `--add-rules`
+    #[clap(long)]
+    disable_builtin_rules: bool,
+
     /// deprecated, does nothing (we always procgen now)
     #[clap(long, hide = true)]
     procgen_tests: bool,
@@ -162,6 +171,7 @@ pub fn make_app() -> Config {
         add_tests,
         rules,
         disable_builtin_tests,
+        disable_builtin_rules,
         // unimplemented
         select_vals: _,
         key: _,
@@ -257,6 +267,7 @@ Hint: Try using `--pairs {name}_calls_rustc` or `--pairs rustc_calls_{name}`.
         run_selections,
         minimizing_write_impl,
         disable_builtin_tests,
+        disable_builtin_rules,
         paths,
     }
 }

src/harness/read.rs

@@ -33,14 +33,18 @@ impl Pathish {
 }
 
 pub fn find_test_rules(cfg: &Config) -> Result<Vec<ExpectFile>, GenerateError> {
-    let static_rules = find_test_rules_static()?;
+    let static_rules = find_test_rules_static(cfg.disable_builtin_rules)?;
     let rules = find_test_rules_runtime(&cfg.paths.runtime_rules_file)?;
     Ok(vec![static_rules, rules])
 }
 
-pub fn find_test_rules_static() -> Result<ExpectFile, GenerateError> {
-    let data = files::static_rules();
-    let rules = toml::from_str(&data)?;
+pub fn find_test_rules_static(disable_builtin_rules: bool) -> Result<ExpectFile, GenerateError> {
+    let rules = if disable_builtin_rules {
+        ExpectFile::default()
+    } else {
+        let data = files::static_rules();
+        toml::from_str(&data)?
+    };
     Ok(rules)
 }
 

src/main.rs

@@ -74,6 +74,7 @@ pub struct Config {
     pub minimizing_write_impl: WriteImpl,
     pub rustc_codegen_backends: Vec<(String, String)>,
     pub disable_builtin_tests: bool,
+    pub disable_builtin_rules: bool,
     pub paths: Paths,
 }