must either both be scalars or both be lists. Otherwise Perl won't
know which context to supply to the right side.
-=item Assigning to negative offset in vec
+=item Negative offset to vec in lvalue context
-(F) The second argument to vec() must refer to an actual element of
-the string if you wish to assign to it.
+(F) When vec is called in an lvalue context, the second argument must be
+greater than or equal to zero.
=item Attempt to bless into a reference
(W internal) The internal sv_replace() function was handed a new SV with
a reference count of other than 1.
-=item Reference to nonexistant group before << HERE in regex m/%s/
+=item Reference to nonexistent group before << HERE in regex m/%s/
(F) You used something like C<\7> in your regular expression, but there are
not at least seven sets of capturing parentheses in the expression. If you