Thanks for the bugfix PR, but the JASS library implementation in the master branch is kind of deprecated, because I made a new implementation on the vjass branch (which I basically use as a development branch at the moment). The new implementation does not attempt to evaluate the value of the expression so it does not have this issue.

The new implementation is closer to roslyn/C# syntax, and it supports trivia so you can make changes to the syntax tree without losing whitespace information. Obviously this is a breaking change and I never got around to rewriting all the code which depends on the JASS library (including the decompiler project which I see you also made a PR for).