Node parser fails to recognize renamed `ts` inputs

Describe the bug

Baskets in csp are not iterable, but should be.

To Reproduce

This code will raise an error:

import csp
from csp import ts

@csp.node
def n(values: [ts[int]]):
    for val in values:
        if csp.ticked(val):
            pass
 
>> CspParseError: unrecognized input 'val'

This code will not:

import csp
from csp import ts

@csp.node
def n(values: [ts[int]]):
    for i in range(len(values)):
        if csp.ticked(values[i]):
            pass

Similarly for dictbaskets:

import csp
from csp import ts

@csp.node
def n(values: {str: ts[int]}):
    for key, val in values.items():
        if csp.ticked(val):
            pass

>> CspParseError: unrecognized input 'val'

import csp
from csp import ts

@csp.node
def n(values: {str: ts[int]}):
    for key, val in values.items():
        if csp.ticked(values[key]):
            pass

Expected behavior

Both of the snippets given above (for list/dictbaskets) should be equivalent.

Error Message

Runtime Environment

0.0.4
3.8.12 (default, Apr 7 2022, 17:33:24)
[GCC 11.2.0]
linux

Additional context

Reproduce the listbasket and dictbasket examples with Python 3.8.12, then trace the csp.node parser and the CspParseError path for loop variables and renamed ts inputs. Done means both iteration forms are accepted equivalently and regression coverage confirms the reported snippets no longer raise the parse error.