Doug Gregor 2594de613b [Type checker] Don't re-insert node types when merging solutions. ...

Merging partial solutions can end up assigning the same type to a
particular typed node (expression, parameter, etc.), which can lead to
unbalanced set/clear when exploring the solution space (and later on,
crashes). Don't re-insert such information.

This is the same approach taken for type variable bindings, but it's
all pretty unfortunate: partial solutions should only record
information relative to their part of the constraint system, which
would save time and memory during solving. Howver, that's too big a
change for right now.

Fixes rdar://problem/50853028.

2019-06-11 17:34:45 -07:00

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