zig/doc/langref/cli_allocation.zig

const std = @import("std");

pub fn main() !void {
    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
    defer arena.deinit();

    const allocator = arena.allocator();

    const ptr = try allocator.create(i32);
    std.debug.print("ptr={*}\n", .{ptr});
}

// exe=succeed