Tuple Concatenation

[zaphar]

Some things would be more convenient to express if you could build up a tuple via expression.

For Example:

let base = { foo = "bar" };

let withField = select (expression) => {
  true = base{ count = 1 },
  false = base,
};

versus:

let withField = { foo = "bar" } + select (expression) => {
  true = { count = 1 },
  false = {},
};

The second variation is more concise. This however is not an orthogonal feature so it's worth considering if it is worth the weight. The implementation is essentially equal to the Copy operation on a tuple just an alternate syntax to express it.