In a follow CL, I'm planning to try to pass inference contexts around
on the stack rather than using static calls to InferenceContext. This
should be both more performant (since it will use less memory and
won't require map lookups) and easier to debug. To prepare for this I
want to get rid of migration engine's use of
InferenceContext.getContext().
It turns out that the only contexts needed by the migration engine
were (a) the context of an expression passed to
modifyExpressionType(), and (b) the context of any binary `??`
expressions that are its parent. I've addressed (a) by passing the
context as a parameter to modifyExpressionType(), and I've addressed
(b) by creating an additional hook that records the context of any
binary expression at the time it is entered.
Change-Id: Ic844d40b5323fcee2ec8bde052449cbe9d878cc4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/229361
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Paul Berry
43206b1d9a