Alexis Laferrière 4327c7342f [Serialization] Attempt to load transitive impl-only dependencies on testable imports ...

Implementation-only dependencies may be referenced from internal decls.
When that module is imported as @testable, clients see the internal
decls and may fail accessing them if the transitive implementation-only
dependencies are not loaded.

Let's consider such transtive implementation-only dependencies as
optional for @testable imports. As such, the compiler will attempt to
load them for test targets, and won't fail if the dependency is missing.

We can make these dependencies required for non-public imports, but it
could be project breaking to do so for implementation-only dependencies.
Considering them as optional is a decent compromise.

rdar://79459263

2023-03-31 09:34:56 -07:00

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