config/merge: allow obtaining a transcript of merge operations #1127
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We didn't have any test for merging non-IgnoreDuplicates primitive list items that are present in both lists.
If FCCT wants to use config merging to implement desugaring, it needs to be able to map fields in the merged config back to the original FCC YAML, which means that it needs a mapping from input to output fields. Add a merge function that also returns a transcript of field mappings.
Move all in-tree callers to MergeStructTranscribe(), which doesn't require using the reflection API, and deprecate MergeStruct(). We can't remove it because that would require a major version bump.
arithx
approved these changes
Nov 24, 2020
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If FCCT wants to use config merging to implement desugaring, it needs to be able to map fields in the merged config back to the original FCC YAML, which means that it needs a mapping from input to output fields. Add a merge function that also returns a transcript of field mappings.