Struct ExecutionBounds 

pub struct ExecutionBounds {
    pub max_call_depth: usize,
    pub max_steps: Option<usize>,
}

How much a blue program may do before it is refused: nested calls and evaluation steps.

Both are BOUNDS in the sense blue-lang-cli’s config module admits: a terminating program under bounds above its cost returns the same value, and one that exceeds either is refused with a catchable depth-exceeded or fuel-exhausted error naming the limit and the function — never a process abort, which is what exceeding the host stack was before tatara-lisp-eval 0.3.63. The walker and the VM run under the same bounds and refuse with the same message.

Fields

max_call_depth: usize

Nested (non-tail) calls alive at once. Tail calls do not count.

max_steps: Option<usize>

Evaluation steps per run; None is unbounded.

Implementations

impl ExecutionBounds

pub const DEFAULT: Self

Depth at tatara-lisp-eval’s DEFAULT_MAX_DEPTH, steps unbounded.

The two defaults differ for one reason: whether a program that works today keeps working. A recursion past 100k frames never worked — it aborted the process — so bounding depth removes no behaviour. A run longer than any finite step count did work (simulations, tools on nodes), so a default step bound would remove it; for a few hours of 2026-09-29 blue shipped 50M (~3 s) and did exactly that. A host that runs code it did not write, or a test that must see a runaway end, sets max_steps itself.

Trait Implementations

impl Clone for ExecutionBounds

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ExecutionBounds

impl Debug for ExecutionBounds

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ExecutionBounds

impl PartialEq for ExecutionBounds

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ExecutionBounds