[perl #128054] [BUG] In a string enclosed in parens, a {}-interpolation can't access the topic $_ of a statement modifier

[Sam S. via RT]

This bug is still present in

    This is Rakudo version 2017.05-134-g0c5fe56cc built on MoarVM version 
2017.05-25-g62bc54e9
    implementing Perl 6.c.