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nice
Combined from primary sources listed below.

In Backtrace§

See primary documentation in context for method nice. 

method nice(Backtrace:D: :$oneline)

Returns the backtrace as a list of interesting frames. If :$oneline is set, will stop after the first frame.

sub zipi { { { die "Something bad happened" }() }() };
try zipi;
say $!.backtrace.nice( :oneline ) if $!;
# OUTPUT: «  in sub zipi at /tmp/... line 1␤␤»