Expose derive macro behind feature

crates/decodal-core/Cargo.toml

@@ -13,7 +13,9 @@ categories = ["config", "parser-implementations"]
 [features]
 default = ["std"]
 std = []
+derive = ["dep:decodal-derive"]
 regex = ["std", "dep:regex"]
 
 [dependencies]
+decodal-derive = { version = "0.1.1", path = "../decodal-derive", optional = true }
 regex = { version = "1.10", default-features = false, features = ["std", "unicode-perl"], optional = true }

crates/decodal-core/src/lib.rs

@@ -16,6 +16,8 @@ pub mod typed;
 
 pub use ast::{Ast, BinaryOp, CompareOp, Expr, ExprId, Field, Literal, Param};
 pub use constraints::normalize_constraints;
+#[cfg(feature = "derive")]
+pub use decodal_derive::Decodal;
 pub use diagnostic::{Diagnostic, DiagnosticKind, Result};
 pub use embedding::{HostField, HostValue};
 pub use eval::{Engine, format_diagnostic_with};