Fix import

sparse_strips/vello_common/src/coarse.rs

diff --git a/sparse_strips/vello_common/src/coarse.rs b/sparse_strips/vello_common/src/coarse.rs
index 2948779..ac8ca43 100644
--- a/sparse_strips/vello_common/src/coarse.rs
+++ b/sparse_strips/vello_common/src/coarse.rs
@@ -9,7 +9,7 @@
     tile::Tile,
 };
 use alloc::vec;
-use alloc::vec::Vec;
+use alloc::{boxed::Box, vec::Vec};
 use vello_api::color::PremulRgba8;
 use vello_api::{paint::Paint, peniko::Fill};