Previously, we inferred the return type of statements in a way that made it
impossible to prove the statement typing consistency. Now, we use just the
stated return type for checking statements.
The proofs of statement typing are complete, except for one result generalizing
the expression typing consistency result to multiple variables changing; this
result is obvious to see directly from the provided lemmas but very tedious to
prove in Coq.
Bug:
Change-Id: I0bbcfb613df7510015f278fa85021ba0b3e57503
Reviewed-on: https://dart-review.googlesource.com/9020
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
I also added mutual induction schemes for types and expressions.
Some changes from the "Cleanup" revision are in here as well because Gerrit is terrible.
Bug:
Change-Id: I0859a6c1cba8179e0a64cc0455ab2a83fad8f26b
Reviewed-on: https://dart-review.googlesource.com/5300
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
Samir Jindel