Describe the Backtrace class in the debugging section.

Author: Dan Zwell

doc/Programs/01-debugging.pod6

@@ -71,4 +71,20 @@ name of the current subroutine / method to the standard error stream:
 
 This can be handy as a cheap trace function.
 
+=head2 The C<Backtrace> class
+
+The C<Backtrace> class gets the current call stack, and can return it as a
+string:
+
+    my $trace = Backtrace.new;
+    sub inner { say ~Backtrace.new; }
+    sub outer { inner; }
+    outer;
+
+    # OUTPUT:
+    # perl6 /tmp/script.p6
+    #   in sub inner at /tmp/script.p6 line 2
+    #   in sub outer at /tmp/script.p6 line 3
+    #   in block <unit> at /tmp/script.p6 line 4
+
 =end pod