Add host prelude embedding API

crates/decodal-core/src/lib.rs

@@ -4,6 +4,7 @@ extern crate alloc;
 
 pub mod ast;
 pub mod diagnostic;
+pub mod embedding;
 pub mod eval;
 pub mod lexer;
 pub mod module;
@@ -13,11 +14,12 @@ pub mod span;
 
 pub use ast::{Ast, BinaryOp, CompareOp, Expr, ExprId, Field, Literal, Param};
 pub use diagnostic::{Diagnostic, DiagnosticKind, Result};
+pub use embedding::{HostField, HostValue};
 pub use eval::Engine;
 pub use lexer::{Lexer, Token, TokenKind};
 pub use module::{EmptyLoader, LoadedSource, Module, SourceLoader};
 pub use parser::{ParseOutput, Parser, SourceForm, parse_source, parse_source_with_source_id};
-pub use runtime::{Data, ExprRef, ModuleId, RuntimeValue};
+pub use runtime::{Constraint, Data, ExprRef, LiteralValue, ModuleId, PrimitiveType, RuntimeValue};
 pub use span::{SourceId, Span};
 
 pub fn version() -> &'static str {