A simple test follows:

Hello, world!

Now perform a hash assignment:

test23 Hello, world! hello all 1

Now update the assignment and repeat:

test23 Hello, world! hello all 1

Now reassign the list and repeat:

test23 Hello, world! 1 Temporary Temporary Temporary

Pathological case: zero item hash:

Hash of number literals:

2

Hash concatenation:

a => 1 b => 3 c => 4

Empty hash concatenation:

foo, bar