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The Deadly Sins from P. J. Brown's Writing Interactive Compilers
and Interpreters, Wiley 1979. Regrettably, the book is long out
of print.
The first deadly sin is to code before you think.
The second deadly sin is to assume the user has all the
knowledge the compiler writer has.
The third deadly sin is not to write proper documentation.
The fourth deadly sin is to ignore language standards.
The fifth deadly sin is to treat error diagnosis as an
afterthought.
The sixth deadly sin is to equate the unlikely with the
impossible.
The seventh deadly sin is to make the encoding of the
compiler dependent on its data formats.
The eighth deadly sin is to use numbers for objects that
are not numbers.
The ninth deadly sin is to pretend you are catering for
everyone at the same time.
The tenth deadly sin is to have no strategy for processing
break-ins.
The eleventh deadly sin is to rate the beauty of
mathematics above the usability of your compiler.
The twelfth deadly sin is to let any error go undetected.
The thirteenth deadly sin is to leave users to find the
errors in your compiler.