1 files changed, 8 insertions, 9 deletions
diff --git a/src/syntax/span.rs b/src/syntax/span.rs
index 5087dffa..65b1d637 100644
--- a/src/syntax/span.rs
+++ b/src/syntax/span.rs
@@ -19,14 +19,15 @@ impl<T> WithSpan for T {}
 /// Span offsetting.
 pub trait Offset {
     /// Offset all spans contained in `Self` by the given position.
-    fn offset(self, by: Pos) -> Self;
+    fn offset(self, by: impl Into<Pos>) -> Self;
 }
 
 /// A vector of spanned values of type `T`.
 pub type SpanVec<T> = Vec<Spanned<T>>;
 
 impl<T> Offset for SpanVec<T> {
-    fn offset(mut self, by: Pos) -> Self {
+    fn offset(mut self, by: impl Into<Pos>) -> Self {
+        let by = by.into();
         for spanned in &mut self {
             spanned.span = spanned.span.offset(by);
         }
@@ -34,9 +35,6 @@ impl<T> Offset for SpanVec<T> {
     }
 }
 
-/// A box of a spanned value of type `T`.
-pub type SpanBox<T> = Box<Spanned<T>>;
-
 /// A value with the span it corresponds to in the source code.
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize))]
@@ -90,7 +88,7 @@ impl<T> Spanned<Option<T>> {
 }
 
 impl<T> Offset for Spanned<T> {
-    fn offset(self, by: Pos) -> Self {
+    fn offset(self, by: impl Into<Pos>) -> Self {
         self.map_span(|span| span.offset(by))
     }
 }
@@ -174,7 +172,8 @@ impl Span {
 }
 
 impl Offset for Span {
-    fn offset(self, by: Pos) -> Self {
+    fn offset(self, by: impl Into<Pos>) -> Self {
+        let by = by.into();
         Self {
             start: self.start.offset(by),
             end: self.end.offset(by),
@@ -236,8 +235,8 @@ impl Pos {
 }
 
 impl Offset for Pos {
-    fn offset(self, by: Self) -> Self {
-        Pos(self.0 + by.0)
+    fn offset(self, by: impl Into<Pos>) -> Self {
+        Pos(self.0 + by.into().0)
     }
 }