Addition of with-statement breaks some existing code
The newly introduced with-statement breaks existing code where with appears at the beginning of a statement. As far as I can tell, this affects assignment and method call expressions.
Best would be to try parse it as with-statement first, and if that fails, check if it's a valid expression statement instead. Only if it's neither report an error.
This affects the recently published 0.50.0 compiler and probably some of the 0.49 series.
Edited by Marvin W