Introduction to compile time variables.

doc/Language/variables.pod6

@@ -1049,20 +1049,26 @@ the block to the caught exception.
 
 X<|$?FILE>X<|$?LINE>X<|::?CLASS>X<|&?ROUTINE>X<|&?BLOCK>X<|%?LANG>X<|%?RESOURCES>
 
+All compile time variables have a question mark as part of the twigil.
+Being I<compile time> they cannot
+be changed at run-time, however they are valuable in order to introspect
+the program.
+The most common compile time variables are the following:
+
 =for table
     $?FILE         Which file am I in?
     $?LINE         Which line am I at?
     ::?CLASS       Which class am I in?
-    &?BLOCK        Which block am I in?
     %?LANG         What is the current set of interwoven languages?
     %?RESOURCES    The files associated with the "Distribution" of the current compilation unit.
 
-
 =head3 Other compile-time variables:
 
 X<|$?PACKAGE>X<|$?MODULE>X<|$?CLASS>X<|$?ROLE>
 X<|$?GRAMMAR>X<|$?TABSTOP>X<|$?NL>X<|$?ENC>
 
+The following compile time variables allow for a deeper introspection:
+
 =for table
     $?PACKAGE   Which package am I in?
     $?MODULE    Which module am I in?