model gets wrongly rejected by the lexer

[Lennart Ochel]

The following model should pass the lexer:

model foo
  parameter String s3(start="three");
end foo;

Output

Error processing file: foo.mos
[foo.mos:4:35-4:35:writable] Error: Missing token: EQUALS
# Error encountered! Exiting...
# Please check the error message and the flags.
Execution failed!