[BUG] return type hinting in python

[WooheonHong]

If I add a return type hinting, All codes under the function declaration are changed to the same color(#9CDCFE) except for the function name.

I found that this happens no matter what character you put in front of the function declaration letter ":".

def fun(x : int) -> x : int:
# all code #9CDCFE
    x += 1 
    return x 

# all code #9CDCFE
def fun2(): 
    pass

def fun(x : int):
# It is okay
    x += 1 
    return x 

def fun2():
    pass