feat: ergonomics for the SpanRange enum construction

src/lib.rs

@@ -50,6 +50,30 @@ pub enum SpanRange {
     RangeFull(std::ops::RangeFull),
 }
 
+impl From<std::ops::Range<usize>> for SpanRange {
+    fn from(value: std::ops::Range<usize>) -> Self {
+        SpanRange::Range(value)
+    }
+}
+
+impl From<std::ops::RangeTo<usize>> for SpanRange {
+    fn from(value: std::ops::RangeTo<usize>) -> Self {
+        SpanRange::RangeTo(value)
+    }
+}
+
+impl From<std::ops::RangeFrom<usize>> for SpanRange {
+    fn from(value: std::ops::RangeFrom<usize>) -> Self {
+        SpanRange::RangeFrom(value)
+    }
+}
+
+impl From<std::ops::RangeFull> for SpanRange {
+    fn from(value: std::ops::RangeFull) -> Self {
+        SpanRange::RangeFull(value)
+    }
+}
+
 /// An input that can provide a span of a range of the input.
 pub trait Span<O> {
     fn span(&self, idx: SpanRange) -> O;