readonly a='A'
readonly b='B'
Ok:0

hush: a=A: readonly variable
Fail:1
hush: a=A: readonly variable
Fail:1

hush: a=Z: readonly variable
Fail:1

hush: a=Z: readonly variable
b=B
^^^a is not exported
hush: a=Z: readonly variable
Visible:42

hush: a: readonly variable
Fail:1