It would be beneficial to make closed interval syntax widely available in the language

[elisbyberi]

I noticed this powerful syntax that checks if a value x is in a closed interval a ... b, it is the same as a <= x <= b.
Using Ellipsis makes the code very expressive and less error-prone.

In my opinion, Codon's status as a Python superset means that backward compatibility with Python is not a priority for the language. Codon already extends Python syntax.

Proposed usage would be:

a = 2
if a in 2 ... 5: # 2 <= a <= 5
    print('a in closed interval [2, 5]')

Current usages:

a = 2
match a:  # assuming that the type of this expression is int
    case 2 ... 10:  # is it 2, 3, 4, 5, 6, 7, 8, 9 or 10?
        print('wow!')

some_tuple = (1, 50)
match some_tuple:  # assuming type of some_tuple is Tuple[int, int]
    case (a, 50 ... 100) | (10 ... 20, b):  # you can nest match expressions
        print('complex!')

[elisbyberi]

#374 (comment)