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Now it shows which program caused a syntax exception.

Now it also shows the variable identifier that is unknown.

Special handling of empty programs.

If failed to enter debug mode because of syntax exception, it will no
longer try to continue the debugging process, thus throwing
IllegalStateExceptions for every program.

"Opt" written on it, so you can see it's a button.

Default watch expressions and conditional breakpoints are now "false".

values.