diff --git a/src/parse_constants.rs b/src/parse_constants.rs
index d9f19e809..8f08dec3c 100644
--- a/src/parse_constants.rs
+++ b/src/parse_constants.rs
@@ -44,6 +44,12 @@ pub struct SourceRange {
     pub length: u32,
 }
 
+impl SourceRange {
+    pub fn as_usize(&self) -> std::ops::Range<usize> {
+        (*self).into()
+    }
+}
+
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum ParseTokenType {
     invalid = 1,