Add missing validity-check for SwiftASTContextReader #1442
Merged
+3
−2
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This is a narrower version of
#1440 spun off for 5.3.
I've kept 'scratch_ctx' wrapped in an Optional to minimize the necessary
source changes. Simply removing the Optional triggers a subsequent
assert because the context lock is not taken (even though the context
reader is invalid).
rdar://65276251