You have a Point with integer coordinates x and y. Create a map m with key type Point (or equivalent) and value type string. Insert "Hello" at position (42, 5).
New implementation

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Other implementations
import "dart:math";
Map<Point, String> m = {};
m[Point(42, 5)] = "Hello";
m := map[Point]string{}
p := Point{x: 42, y: 5}
m[p] = "Hello"
m = dict()
p = Point(x=42, y=5)
m[p] = 'Hello'
from collections import namedtuple
Point = namedtuple('Point', 'x y')

p = Point(42, 5)

m = {p: "Hello"}
Point = Struct.new(:x, :y)
m = {Point.new(42, 5) => "Hello"}
use std::collections::HashMap;
let mut map: HashMap<Point, String> = HashMap::new();
map.insert(Point { x: 42, y: 5 }, "Hello".into());