This adds ExprTopLevel and ExprSingleton and ensures that ExprBind is
now monomorphic.
This corrects a previous design bug where it was not monomorphic and
would thus cause spawning of many more copies than necessary. In most
cases this was only harmful to memory and performance, and not
behaviour, since these functions were pure, and we didn't have a test
for this.
This also adds a bunch more tests. Most notably, the graph shape tests
generally produce smaller graphs now.
Lastly, a lambda cannot have two different types when used at two
different call sites. It is rare that this would be used, and when it
would make sense, there are easy workarounds to accomplish equivalent
goals.
This was mostly authored by Sam, James helped with some cleanup and
debugging.
Co-authored-by: James Shubin <james@shubin.ca>
This is a big giant patch that implements the AST part of lambdas!
I don't know how Sam is able to understand the AST so well, but he does,
and we're all grateful for it. Most of this code was written by him.
Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
This will probably change up again in the future, but this is what we
need for now to make lambdas work.
Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
This is a giant refactor to split the giant lang package into many
subpackages. The most difficult piece was figuring out how to extract
the extra ast structs into their own package, because they needed to
call two functions which also needed to import the ast.
The solution was to separate out those functions into their own
packages, and to pass them into the ast at the root when they're needed,
and to let the relevant ast portions call a handle.
This isn't terribly ugly because we already had a giant data struct
woven through the ast.
The bad part is rebasing any WIP work on top of this.
