. (source) builtin behavior changed when commands are in {} braces

[Roman Rakus]

In previous version (3.0) bash continue after {} braces.
For example:
{
 readonly a
 a=10
} || :

echo hello


In bash 3.2 we've got error message about readonly variable, but "hello" 
is not printed. Is this right behavior or bug?
I investigate this problem and found, that there is added 
top_level_cleanup () function. I don't know what is going on in this 
function, but probably is changing top_level (saved stack context) and 
further calling jump_to_top_level () jumps elsewhere then in bash 3.0. 
For now I comment out calling top_level_cleanup(), but I know, that 
there is better way.

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