From type/Str

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multi method indent(Int $steps where { $_ == 0 } )
multi method indent(Int $steps where { $_ > 0  } )
multi method indent($steps where { .isa(Whatever) || .isa(Int) && $_ < 0 } )

Indents each line of the string by $steps. If $steps is negative, it outdents instead. If $steps is *, then the string is outdented to the margin:

"  indented by 2 spaces\n    indented even more".indent(*)
    eq "indented by 2 spaces\n  indented even more"