Idea that came up over dinner with Parallel Haskellers on Monday: as a dual to the -Werror flag that turns warnings into errors, we should have a -Ewarn flag that turns errors into warnings. The basic idea is that erroneous parts of the program would be replaced by calls to error. Doing this for type errors turns out to be almost trivial, but e.g. parse errors will be somewhat harder. Still, a fun thing to do sometime.
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