pub fn eval_expr(expr: &Expr, env: &Env) -> Result<Value, EvalError>Expand description
Evaluate an rnix expression in an environment.
Uses stacker::maybe_grow to dynamically extend the call stack when
it is close to exhaustion. This prevents stack overflow on deeply
nested nixpkgs fixpoints (50+ overlay applications each creating
multiple recursive eval_expr / force_value frames).
Fast path: Ident (~32% of all evals), Literal, Paren, and Root
expressions don’t recurse and are handled directly, skipping the
stacker::maybe_grow overhead for ~40% of all eval_expr calls.