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.=
Combined from primary sources listed below.

In Operators§

See primary documentation in context for infix .=.

Calls the right-side method on the value in the left-side container, replacing the resulting value in the left-side container.

In most cases, this behaves identically to postfix .=, but the precedence is lower:

my $a = -5;
say ++$a.=abs; # with postfix mutator; equivalent to ++($a.=abs)
# OUTPUT: «6␤»

my $a = -5;
say ++$a .= abs; # with infix mutator; evaluated as -4 .= abs
# OUTPUT: «Cannot modify an immutable Int (-4)␤
#           in block <unit> at <tmp> line 1␤␤»