I noticed this trying to create an array to test plotting
runmat> x = 0:.1:10
Execution error: Failed to parse input 'x = 0:.1:10': Parse error at position 0: unexpected token '.' in expression context
But you can even trigger it with a simple
runmat> a = .1
Execution error: Failed to parse input 'a = .1': Parse error at position 0: unexpected token '.' in expression context
This is a pretty common Matlab usage that will break compatibility trying to run lots of existing code.
Tested with runmat v0.2.7 on Apple M3