x86_64 arch + asm start

src/io/mod.rs

@@ -122,6 +122,15 @@ impl From<String> for CompilerMsg {
     }
 }
 
+impl From<&str> for CompilerMsg {
+    fn from(msg: &str) -> Self {
+        Self {
+            spans: Vec::new(),
+            msg: msg.to_string(),
+        }
+    }
+}
+
 impl<S: Into<String>> From<(S, Span)> for CompilerMsg {
     fn from((msg, span): (S, Span)) -> Self {
         Self {