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is-routine
Combined from primary sources listed below.

In Backtrace::Frame§

See primary documentation in context for method is-routine. 

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

Return True if the frame points into a routine (and not into a mere Block).

my $bt = Backtrace.new;
my $btf = $bt[0];
say $btf.is-routine;