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is-setting
Combined from primary sources listed below.

In Backtrace::Frame§

See primary documentation in context for method is-setting. 

method is-setting(Backtrace::Frame:D: --> Bool:D)

Returns True if the frame is part of a setting.

my $bt = Backtrace.new;
my $btf = $bt[0];
say $btf.is-setting; # OUTPUT: «True␤»