AI-generated C++ code passes tests but fails real-world compilation due to missing includes

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A C++ patch submitted by an AI model passed automated functional tests by a grading system. The patch modified header and source files but omitted necessary standard library includes like <string>. The test driver had already included these libraries, masking the missing includes from the grader. This creates a hidden failure where independent code using the header would fail to compile. The article proposes adding a separate compilation check to verify header hygiene in addition to functional correctness testing.

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