Preprocessor: String termination bug
Length one sub-strings do not appear to be properly terminated, which produces strange results when they are concatenated.
Create a file with the following three lines:
@#define Numbers = "123456789" @#define AString = "One " + Numbers + " Two " + Numbers + " Three " + Numbers @#echo AString
(or just clone StringTermination.mod from https://github.com/tholden/DynareBugs/tree/master).
On my PC, its output is different every time. E.g.:
One 16 Two 26 Three 36
One 1w Two 2w Three 3w