uppercase Amphibian Variables fail within patterns

[HighHarmonics2]

V.x works within pattern language. V.X fails within pattern language. V.X works outside of pattern language. error: ValueError: Cannot pattern an empty sequence: []

To reproduce:

V.X, V.Y, V.W, V.z = ['cp:1', 0.335, 0.556, 0.2]
# fails with empty pattern
@swim
def testAV(p=1, i=0):
    D('(v X)', begin=V.Y, end=V.W, i=i)
    again(testAV, p=P('(v z)', i), i=i+1)

# succeeds
# note that 1st amph Var is now lower case
V.x, V.Y, V.W, V.z = ['cp:1', 0.335, 0.556, 0.2]

@swim
def testAV(p=1, i=0):
    D('(v x)', begin=V.Y, end=V.W, i=i)
    again(testAV, p=P('(v z)', i), i=i+1)

This is a minor problem. It just means that within patterns, amphibian variables must be lower case.

[Bubobubobubobubo]

Yes, unfortunately there is not much I can do about it now but I will have to revise that part of the code sooner or later. Will keep it in mind for the next time I'll dive into that bit.