refactors macroExpandApply

Moves some code around to clearly define the concepts that the method
operates on: 1) `innerPt`, which is expected type provided by the macro
def return type, 2) `outerPt`, which is expected type provided by the
enclosing context.

Once everything is clearly defined, the gist of the expander fits in
a few lines in its end. If blackbox, do this. If whitebox, do that.

Note that unlike the subsequent commit, this commit doesn’t change
the way how macro expansion works. It just clears everything out, so that
the upcoming changes can be applied in a concise and comprehensible manner.

0 files changed, 0 insertions, 0 deletions