When generating config files from templates, conventions from one language (shell # comments) do not transfer to another (xcconfig // comments). If the file is gitignored or never tested in isolation, the parse failure propagates invisibly — the build settings never load, variables resolve to empty, and downstream code fails with a misleading error message pointing somewhere else entirely. The bug lived for an unknown period because the artifact was never opened by the consumer tool that cared about its syntax.
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