first pass of merging in warp (doesn't build)

crates/galaxy_completer/src/meta_tests.rs

@@ -0,0 +1,27 @@
+use super::*;
+
+/*
+0 1 2 3
+w a r p
+-------
+0     4  << the span for the string "warp" is (0, 4)
+
+Spanned {
+    item: String::new("warp"),  << warp string
+    span: Span::new(0, 4)       << span
+}
+
+or >> String::new("warp").spanned(Span::new(0, 4))        */
+fn warp() -> Spanned<String> {
+    String::from("warp").spanned(Span::new(0, 4))
+}
+
+fn empty() -> Spanned<String> {
+    String::new().spanned_unknown()
+}
+
+#[test]
+fn knows_distances() {
+    assert!(warp().span.distance() == 4);
+    assert!(empty().span.distance() == 0);
+}