parse some things

parser/src/lib.rs

@@ -6,7 +6,21 @@ mod parser;
 mod pre;
 mod token;
 
-pub type Span = std::ops::Range<usize>;
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Default)]
+pub struct Span {
+    pub start: usize,
+    pub end: usize,
+}
+
+impl Span {
+    pub fn start_end(start: usize, end: usize) -> Self {
+        Self { start, end }
+    }
+
+    pub fn extend(&self, rhs: Self) -> Self {
+        Self::start_end(self.start, rhs.end)
+    }
+}
 
 pub fn parse_file(src: &str) {
     println!("{src}");