resolved issues with rust bindings

Author: matthewnitschke

.gitignore

@@ -18,4 +18,5 @@ pubspec.lock
 *.dll
 *.dylib
 doc
-.vscode
+.vscode
+target

Cargo.lock

@@ -13,11 +13,11 @@ fn main() {
     // If your language uses an external scanner written in C,
     // then include this block of code:
 
-    /*
+
     let scanner_path = src_dir.join("scanner.c");
     c_config.file(&scanner_path);
     println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
-    */
+
 
     c_config.compile("parser");
     println!("cargo:rerun-if-changed={}", parser_path.to_str().unwrap());