Fixing more errors.

src/compare/util.rs

@@ -1,5 +1,5 @@
 use crate::parser::sexp::Token;
-use crate::parser::Source;
+use crate::types::Source;
 
 /// Check if the child string slice is a slice of the parent string slice.
 fn is_slice_of(parent: &str, child: &str) -> bool {