[perl #77624] [BUG] Base conversion of Str containing base conversion doesn't work in Rakudo

[Christian Bartolomaeus via RT]

A lot of tests for colon--form radix overrides were added to 
S02-literals/radix.t with commit 4c85334660. Those tests cover this ticket as 
well. I mentioned the ticket number in said file.

I'm closing this ticket as 'resolved'.