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Testing the error reporting

Tests with invalid code were written into the test suite to test for the proper handling of errors in the conditional compilation code. Then regression testing, using the rtesting.pl script, could be used by capturing the error message for each invalid test. All error messages caused by invalid test files are captured in a single file called badtests. In badtests, the test file name and error message will be listed for each invalid test file. Once this file is hand-verified, renamed to badtests.v, and badtests.v is checked into the RCS, rtesting.pl will display a .diff file if there is any change in the badtests file on subsequent runs.