#40 Bug in empty reactant syntax -> P1;

[Herbert M Sauro]

The following antimony syntax in telluirum results in a error:

import tellurium as te

r = te.loada ('''
-> P1; k1;
''')

Exception: Antimony: Error in model string, line 2: syntax error, unexpected '>', expecting number

Instead a user has to use one of the following two syntax forms to aviod the error:

$x -> P1
J1: -> P1

If empty reactants are allowed then the syntax -> P1 should be allowed.

Running verison : 2.8.0