[perl #130855] [SPESH][OPTIMIZER] glitch with anon vars causes incorrect `Cannot assign to an immutable value` error

[jn...@jnthn.net via RT]

On Fri, 24 Feb 2017 15:02:23 -0800, c...@zoffix.com wrote:
> Expected no errors, but in the first case it complains about
> assignment to immutable value even though none exist in the code.
> 
> zoffix@VirtualBox:~$ perl6 -e 'm: sub foo () {$ = 42}; for ^2000000 {
> $ = foo }; say now - INIT now'
> Cannot assign to an immutable value
>   in block <unit> at -e line 1
> 
Was fixed in spesh work last month or so; test now added to 
S04-declarations/state.t so we don't regress.