remove panic on malformed @import

src/parse/import.rs

@@ -14,7 +14,7 @@ impl<'a> Parser<'a> {
         let mut file_name = String::new();
         let next = match self.toks.next() {
             Some(v) => v,
-            None => todo!("expected input after @import"),
+            None => return Err(("expected more input.", self.span_before).into()),
         };
         match next.kind {
             q @ '"' | q @ '\'' => {

tests/imports.rs

@@ -1,6 +1,10 @@
+#![cfg(test)]
 use std::io::Write;
 use tempfile::Builder;
 
+#[macro_use]
+mod macros;
+
 /// Create a temporary file with the given name
 /// and contents.
 ///
@@ -132,4 +136,9 @@ fn chained_imports_in_directory() {
     );
 }
 
+error!(
+    missing_input_after_import,
+    "@import", "Error: expected more input."
+);
+
 // todo: test for calling paths, e.g. `grass b\index.scss`