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Xcode uses its own heuristics to determine whether or not to accept top-level code in a source file while Ninja uses the swift driver heuristics. With the Swift driver, if the module contains a single file, that file will be parsed as a top-level code context. With Xcode, the single file will only be parsed as top-level code if the name of that file is 'main.swift'. To ensure more consistent behavior between the two generators, if we're building Swift and the try-compile target type is executable or undefined, we name the file `main.swift` to ensure that both will handle the single file as top-level code.