Keep internal modules private, but re-export under fuzzing feature flag

src/fuzzing/mod.rs

@@ -6,3 +6,27 @@
 //! Utilities for fuzzing.
 
 pub mod func;
+
+// Re-exports for fuzz targets.
+
+pub mod domtree {
+    pub use crate::domtree::*;
+}
+pub mod postorder {
+    pub use crate::postorder::*;
+}
+pub mod moves {
+    pub use crate::moves::*;
+}
+pub mod cfg {
+    pub use crate::cfg::*;
+}
+pub mod ssa {
+    pub use crate::ssa::*;
+}
+pub mod ion {
+    pub use crate::ion::*;
+}
+pub mod checker {
+    pub use crate::checker::*;
+}