[perl #71362] [BUG] Parrot string indexing semantics leaks through when accessing $1 et al. when $/ contains a Str in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: $/ = "abc"; say $1
<p6eval> rakudo 55f51d: b␤
<masak> hihi.
* masak submits rakudobug
<pmichaud> rakudo:  my $a = 'abc';  say $a[1];
<p6eval> rakudo 55f51d: Method 'postcircumfix:[ ]' not found for
invocant of class 'Str' [...]
<pmichaud> heh
<pmichaud> interesting
<pmichaud> rakudo:  $/ = "abc"; say $/[1]
<p6eval> rakudo 55f51d: Method 'postcircumfix:[ ]' not found for
invocant of class 'Str' [...]
<pmichaud> oh, I get it.
<masak> pmichaud: it's PIR semantics leaking through in exactly that case.
<pmichaud> masak++
<pmichaud> masak: right.