improve scss compilation errors

Author: Michael Morgan

src/main.rs

@@ -227,12 +227,15 @@ fn catch_error() -> Template {
 }
 
 fn compile_sass(filename: &str) {
-    let scss = format!("./src/styles/{}.scss", filename);
-    let css = compile_file(scss, Options::default()).expect("couldn't compile sass");
+    let scss_file = format!("./src/styles/{}.scss", filename);
+    let css_file = format!("./static/styles/{}.css", filename);
+
+    let css = compile_file(&scss_file, Options::default())
+        .expect(&format!("couldn't compile sass: {}", &scss_file));
     let mut file =
-        File::create(format!("./static/styles/{}.css", filename)).expect("couldn't make css file");
+        File::create(&css_file).expect(&format!("couldn't make css file: {}", &css_file));
     file.write_all(&css.into_bytes())
-        .expect("couldn't write css file");
+        .expect(&format!("couldn't write css file: {}", &css_file));
 }
 
 fn main() {