[AutoDiff] Fix assert on missing struct decl on cross-file derivative search #77183
+79
−16
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Consider:
struct Struct
withstatic func max
memberextension Struct
with custom derivative of themax
functionStruct.max
.Previously, when passing error.swift as primary file and derivatives.swift as a secondary file to swift-frontend (and forgetting to pass struct.swift as a secondary file as well), an assertion failure was triggered in the following call stack:
This patch fixes the issue by adding a check against
ErrorType
infindAutoDiffOriginalFunctionDecl
before callinglookupMember
.