Do not crash when checking semantics of undeclared symbolic_variable.
NOTE: this update may have broken the printing of error messages
during semantic analysis of IL code.

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default: runtests

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runtests:

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	./runtests

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clean:

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	rm -f *.iec

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	rm -f *.err

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	rm -f *.err2

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	rm -f *.out

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	rm -f *.out2