added YacError type, returned from rust_main()

Cargo.toml

@@ -15,6 +15,5 @@ libc-print = "0.1.21"
 bindgen = "0.63.0"
 
 [features]
-default = [ "entry", "errors"]
+default = [ "entry" ]
 entry = []
-errors = []

src/entry/errors.rs

@@ -31,3 +31,10 @@ impl From<YacError> for (String, u32) {
     (err.message, err.code)
   }
 }
+
+impl From<(String, u32)> for YacError {
+  fn from(err: (String, u32)) -> Self {
+    let (message, code) = err;
+    YacError { message, code }
+  }
+}

src/entry/mod.rs

@@ -1,5 +1,7 @@
 mod args;
+mod errors;
 pub use args::Args;
+pub use errors::*;
 
 use crate::{
     exit,
@@ -34,7 +36,7 @@ pub unsafe fn c_str_to_rust_unchecked(ptr: *const u8) -> &'static str {
 }
 
 extern "Rust" {
-    fn rust_main(args: args::Args) -> Result<u32, (alloc::string::String, u32)>;
+    fn rust_main(args: args::Args) -> Result<u32, YacError>;
 }
 
 #[doc(hidden)]
@@ -50,11 +52,11 @@ pub unsafe extern fn main(argc: c_int, argv: *const *const u8) -> c_int {
                     libc_eprintln!("Unable to ascertain argv[0].");
                     exit(71);
                 });
-            rust_main(args).unwrap_or_else(|(err, code)| {
-                if code == EX_USAGE {
-                    libc_eprintln!("Usage: {} {}", argv0, err);
-                } else { libc_eprintln!("{}: {}", argv0, err); }
-                code
+            rust_main(args).unwrap_or_else(|err| {
+                if err.code == EX_USAGE {
+                    libc_eprintln!("Usage: {} {}", argv0, err.message);
+                } else { libc_eprintln!("{}: {}", argv0, err.message); }
+                err.code
             }) as _
         },
         Err(_) => {

src/lib.rs

@@ -72,11 +72,9 @@ extern crate core;
 
 #[cfg(feature = "entry")]
 mod entry;
-#[cfg(feature = "errors")]
-mod errors;
 
-pub use entry::Args;
-pub use errors::*;
+#[cfg(feature = "entry")]
+pub use entry::*;
 
 pub fn exit(code: u32) -> ! {
   unsafe { libc::exit(code as i32 as libc::c_int); }