//! Symbolic expression parser.
//!
//! Parses textual mathematical expressions into the global DAG. Uses
//! `nom` combinators with precedence climbing for correct operator
//! binding.
//!
//! - `lexer` — Tokenizer for numbers, identifiers, operators, parens.
//! - `expr` — Precedence-climbing expression parser.
//! - `error` — Span-annotated parse error types.
pub use ;