assembler: great leap forwards (more like the Cultural Revolution)

assembler/src/source/source_info.rs

@@ -0,0 +1,17 @@
+//! This file contains information on where a [`Token`] or [`Node`] is within the source
+//! code for more informative errors. This will likely be attached to a [`Token`] which
+//! will in turn be attached to an AST [`Node`].
+
+use uuid::Uuid;
+
+///  Information on where the token is within the source.
+#[derive(Debug)]
+pub struct SourceInfo {
+    /// The line number within the source file underpinned by `module_id`.
+    pub line_no: usize,
+    /// The ID of the module containing this token. This will be looked up in the global
+    /// hashmap of [`Module`]'s.
+    pub module_id: Uuid,
+    /// The indexes where this token may be found (line-local).
+    pub span: std::ops::Range<usize>,
+}