feat: Add CopyableExpressionAST

Author: lmondada

tket/src/lib.rs

@@ -54,6 +54,7 @@ pub mod passes;
 pub mod resource;
 pub mod rewrite;
 pub mod serialize;
+pub mod subcircuit;
 
 #[cfg(feature = "portmatching")]
 pub mod portmatching;

tket/src/subcircuit.rs

@@ -0,0 +1,5 @@
+//! Placeholder file until subcircuit is merged, see
+//! https://github.com/CQCL/tket2/pull/1054
+
+mod expression;
+pub use expression::CopyableExpressionAST;