Concurrency & Structs

Source: tests/language/concurrency_structs.crush

Struct instantiation with field access, plus spawn/yield for cooperative multitasking.

// Struct instantiation
let p = new Point();
p.x = 10;
p.y = 20;
print("Point x: " + p.x);
print("Point y: " + p.y);

// Spawn a concurrent task
print("Main starting spawn");
spawn worker();

print("Main yielding 1");
yield;

print("Main yielding 2");
yield;

print("Main resumed");

fn worker() {
    print("Worker running");
    yield;
    print("Worker finishing");
}

What this shows:

• new StructName() instantiates a struct
• Field assignment and access via . operator
• spawn fn() — launches a function as a cooperative task
• yield — suspends the current task and switches to another ready task
• spawn/yield implement M:1 cooperative concurrency (no preemption)

The tree-sitter grammar also supports struct definitions with typed fields:

struct Point {
    x: Float,
    y: Float
}

let p = Point { x: 10.0, y: 20.0 };
print(p.x);