Use pattern match to support pattern matching of int, wildcard and variable.

Apply pattern match to integer

Apply pattern match to integer, matching the second case

Apply pattern match to integer, matching wildcard case

Use pattern matching in variable initializer

Apply pattern match to integer, matching int out of order

Apply pattern match to integer starting non-zero, matching the first

Apply pattern match to integer starting non-zero, matching second

Apply pattern match to integer starting non-zero, matching wildcard

Apply pattern match to integer case with gap, matching first

Apply pattern match to integer case with gap, matching second

Apply pattern match to integer case with gap, matching wildcard

Apply pattern match to negative integer case

Apply pattern match to negative integer case, matching the second

Apply pattern match to negative integer case, matching the wildcard

Apply pattern match to variable case, matching the variable expr