You know, this gives us a better rationale for using SPLIT in the
doing macro I threw around before.

define-syntax doing
  syntax-rules (let)
    \\
    . doing
    .   x
    . \\ x
    \\
    . doing
    .   let var \\ value ; \\ is a "twisted equals" sign.
    .   body
    .   ...
    . \\ let ((var value))
    . .    doing
    . .      body
    . .      ...
    \\
    . doing
    .   x
    .   body
    .   ...
    . \\ begin x
    . .    body
    . .    ...


So I'm doing some stuff...

doing
  some-stuff()
  some-more-stuff()

then I decide I want to assign something...

doing
  some-stuff()
  some-more-stuff()
  let some-varaible \\ some-value-I-want-to-assign(x y)

then use the variable later...

doing
  some-stuff()
  some-more-stuff()
  let some-varaible \\ some-value-I-want-to-assign(x y)
  use(some-variable)

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