feat: expose Function type in the public API

Author: burdockcascade

src/lib.rs

@@ -8,6 +8,7 @@ pub mod prelude {
     pub use crate::builder::ProgramBuilder;
     pub use crate::builder::FunctionBuilder;
     pub use crate::program::Program;
+    pub use crate::program::Function;
     pub use crate::runtime::Vm;
     pub use crate::runtime::VmError;
     pub use crate::runtime::VmExecutionResult;