Value blocks for simplifying defining nested values

[Arithmomaniac]

Clear and concise description of the problem

Taking this example from the documentation:

const example = #{
  prop1: #{ nested: true }; // ok
  prop2: { nested: true }; // error: values can't reference a type
}

The nested #s are fine at a small scale, but for larger objects (like @example) it cuts against the grain of how people expect to read code. (It also prevents people from pasting in JavaScript objects they may already have, which otherwise would work.)

The proposal here, inspired by the raw string syntax in C#, would be to allow something like the following:

const example = ###
{
  prop1: { nested: true }; // ok, because in a value block
}
###

In this block, { and [ would be interpreted like #{ and #[, respectively.