fix: fix the inconsistency in filename drive letters

kclvm/parser/src/parser/mod.rs

@@ -83,13 +83,32 @@ impl<'a> Parser<'a> {
         let hi = self.sess.lookup_char_pos(hi);
 
         let filename: String = format!("{}", lo.file.name.prefer_remapped());
-        (
-            filename,
-            lo.line as u64,
-            lo.col.0 as u64,
-            hi.line as u64,
-            hi.col.0 as u64,
-        )
+
+        #[cfg(target_os = "windows")]
+        {
+            use kclvm_utils::path::PathPrefix;
+            // The canonicalize() function will change the drive letter to uppercase in Windows.
+            // e.g.: c:\\xx -> C:\\xx
+            let file = std::path::Path::new(&filename).canonicalize().unwrap();
+            let case_insensitive_filename = file.adjust_canonicalization();
+            (
+                case_insensitive_filename,
+                lo.line as u64,
+                lo.col.0 as u64,
+                hi.line as u64,
+                hi.col.0 as u64,
+            )
+        }
+        #[cfg(not(target_os = "windows"))]
+        {
+            (
+                filename,
+                lo.line as u64,
+                lo.col.0 as u64,
+                hi.line as u64,
+                hi.col.0 as u64,
+            )
+        }
     }
 
     pub(crate) fn bump(&mut self) {