[SR-12351] Import errors not surfaced with incremental builds #4575
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Environment
Ubuntu 18.04 with Swift for TensorFlow nightly build from 2020-03-11
$ swift --version
Swift version 5.2-dev (LLVM b3057cffb6, Swift 3e7cb166a6)
Target: x86_64-unknown-linux-gnu
Additional Detail from JIRA
md5: 796f88aabcc747826454c1435fdc2203
Issue Description:
Incremental builds are not surfacing import errors caused by missing dependencies. This PR adds a missing dependency, but without it, `swift build` does not surface any errors.
To reproduce:
Checkout the swift-models repo at this commit and run `swift build`, then `swift test`, without seeing any failures: tensorflow/swift-models@909a98e
Run `rm -rf .build && swift test` to see import errors described in this PR.
Run `rm -rf .build && swift build && swift test` to see the errors disappear again.
Run `swift package clean && swift test` to see the errors reappear.
After adding the missing dependency (e.g. merging this PR), all of the above steps give clean builds.
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