1 files changed, 17 insertions, 2 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 34e87c5e..bcbf8478 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -34,6 +34,8 @@
 #[macro_use]
 pub mod util;
 #[macro_use]
+pub mod memo;
+#[macro_use]
 pub mod geom;
 #[macro_use]
 pub mod diag;
@@ -45,13 +47,13 @@ pub mod frame;
 pub mod image;
 pub mod library;
 pub mod loading;
-pub mod memo;
 pub mod model;
 pub mod parse;
 pub mod source;
 pub mod syntax;
 
 use std::collections::HashMap;
+use std::hash::Hasher;
 use std::path::PathBuf;
 use std::sync::Arc;
 
@@ -61,7 +63,8 @@ use crate::font::FontStore;
 use crate::frame::Frame;
 use crate::image::ImageStore;
 use crate::loading::Loader;
-use crate::model::{PinBoard, StyleMap};
+use crate::memo::Track;
+use crate::model::{PinBoard, PinConstraint, StyleMap};
 use crate::source::{SourceId, SourceStore};
 
 /// Typeset a source file into a collection of layouted frames.
@@ -104,6 +107,18 @@ impl Context {
     }
 }
 
+impl Track for &mut Context {
+    type Constraint = PinConstraint;
+
+    fn key<H: Hasher>(&self, hasher: &mut H) {
+        self.pins.key(hasher);
+    }
+
+    fn matches(&self, constraint: &Self::Constraint) -> bool {
+        self.pins.matches(constraint)
+    }
+}
+
 /// Compilation configuration.
 pub struct Config {
     /// The compilation root.