OutOfMemoryError/memory leak on e.<number> input

[Maxr1998]

Running the following code causes my Android app the memory usage to rise rapidly until it is interrupted or crashes.

val ex = Expression("e.1")
ex.evaluate()

It's reproducible on both 3.0.4 and 3.0.3, I haven't checked any other versions. In the debugger I noticed that the Tokenizer.tokens list is seemingly the culprit, containing thousands of NUMBER_LITERAL entries with value set to an empty string.

[uklimaschewski]

Hi, I would expect this to produce a parsing error before trying to evaluate.