[Sema] Downgrade to a warning public imports of an underlying private module #40770
+29
−16
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Diagnostics of public imports of private modules are more likely to be wrong about imports of the underlying module from a Swift overlay due to weird project configuration/installation, or the fact that private overlays are installed in the same folder as public ones. Let's always downgrade these diagnostics to warnings to help landing the rest of the diagnostics as errors.
rdar://87262431