fix @differentiable function in .swiftinterface #25059
Merged
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While messing with .swiftinterface files, I discovered that
@differentiable
functions don't get printed correctly in .swiftinterface files.The test in
test/AutoDiff/differentiable_attr_parseable_interface.swift
demonstrates what this fixes.The extra test in
test/Serialization/differentiable_attr.swift
was already passing before this change, but I noticed that that file didn't have a@differentiable
function as a param, so I thought it would be good it to add to that file too.