de1eabf22c
Xcode.prefix and Xcode.installed? use slightly different heuristics to find Xcode. In fact, .installed? basically duplicates a portion of the .prefix logic. In practice, the methods results are usually consistent, but .installed? does not handle non-standard prefixes if mdfind cannot locate Xcode (for example, if the user has disabled Spotlight indexing). Since .installed? is essentially a subset of the .prefix logic, we can rely on the result from .prefix instead. Fixes Homebrew/homebrew#16790.
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