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implicit blocks

CLtL specifies that the body of a defun is implicitly surrounded  by a
block with the same name as the defun.  As far as I can find, it makes
no such stipulation about the bodies of named lexical functions introduced
with FLET or LABELS, nor for macro bodies (defmacro, macrolet).

Of the three implementations I have looked at, two do supply implicit
blocks for FLET, LABELS, and DEFMACRO (I didn't check for macrolet),
and one supplies an implicit block ONLY for DEFUN.  

Has this been clarified in earlier discussions?  
 From the standpoint of transforming code, it would be desireable 
for the implicit block to be supplied in either ALL or NONE of
the above.  From the standpoint of utility, I would suggest ALL.