added simple example + fixed warning in ast.rs

examples/simple.rs

@@ -0,0 +1,15 @@
+use cpp_demangle::Symbol;
+
+pub fn main() -> Result<(), Box<dyn std::error::Error>> {
+
+    let mangled = b"_ZN5space3fooEibc";
+
+    let sym = Symbol::new(&mangled[..])?;
+    let demangled = sym.to_string();
+
+    println!("{}", demangled);
+
+    assert_eq!(demangled, "space::foo(int, bool, char)");
+
+    Ok(())
+}

src/ast.rs

@@ -355,6 +355,7 @@ trait ArgScope<'me, 'ctx>: fmt::Debug {
     fn get_template_arg(&'me self, index: usize)
         -> Result<(&'ctx TemplateArg, &'ctx TemplateArgs)>;
 
+    #[allow(unused)]
     /// Get the current scope's `index`th function argument's type.
     fn get_function_arg(&'me self, index: usize) -> Result<&'ctx Type>;
 }