[perl #66034] dotty:<.=> and infix:<.=> inconsistent

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

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01:21 <@jnthn> rakudo: my %h = B => 2; my $x = "ABC"; $x .= 
subst(/(<[BD]>)/,
{%h{$0}},:global); say $x;
01:21 < p6eval> rakudo 695300: OUTPUT«A2C␤»
01:21 <@jnthn> rakudo: my %h = B => 2; my $x = "ABC"; $x.=subst(/(<[BD]>)/,
{%h{$0}},:global); say $x;
01:21 < p6eval> rakudo 695300: OUTPUT«Use of uninitialized value␤Use of
uninitialized value␤AC␤»
01:21 <@jnthn> Nailed it.
01:21 < DanielC> spaces?
01:22 <@jnthn> DanielC: Bit more to it than that. Those two actually parse
differently.
01:22 <@jnthn> But should be behaviourly equivalent.
01:22 <@jnthn> So, Rakudo bug.