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MAL debugger

In practice it is hard to write a correct MAL program the first time around. Instead, it is more often constructed by trial-and-error. As long as there are syntax and semantic errors the MAL compiler provides a sufficient handle to proceed. Once it passes the compiler we have to resort to a debugger to assess its behavior.

Note, the MAL debugger described here can be used in conjunction with the textual interface client mclient only. The JDBC protocol does not permit passing through information that 'violates' the protocol.