Enum Step 

pub enum Step {
    Call(Call),
    Branch {
        arms: Vec<Arm>,
    },
    Loop {
        label: String,
        body: Vec<Step>,
    },
    Optional {
        label: String,
        body: Vec<Step>,
    },
    Parallel {
        arms: Vec<Arm>,
    },
    Return(Exit),
}

One node of a Flow.

Variants

Call(Call)

A call. Rendered as a message arrow. Calls nested in receivers and arguments appear as separate, earlier steps (evaluation order).

Branch

Mutually exclusive arms (if/else if/else, match). Rendered as alt / else.

Fields

arms: Vec<Arm>

Arms in source order. Arms without calls are kept (with empty steps) only when they matter for reading the branch, e.g. an else that returns early.

Loop

A loop (for, while, loop, iterator adaptors with closures). Rendered as loop.

Fields

label: String

Loop header, e.g. for item in items.

body: Vec<Step>

Body.

Optional

A block that may not run (if without else, if let, closures passed to map/and_then). Rendered as opt.

Fields

label: String

Condition, e.g. if let Some(x) = cache.get(k).

body: Vec<Step>

Body.

Parallel

Concurrent arms (join!, select!, spawned tasks). Rendered as par / and.

Fields

arms: Vec<Arm>

Arms.

Return(Exit)

An explicit early exit (return, ? propagation, break out of a labelled loop). Rendered as a note or a reply arrow.

Trait Implementations

impl Clone for Step

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Step

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Step

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Step

impl PartialEq for Step

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Step

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Step