Consider the following:
perl << EOF
some code that contains Vim keywords
EOF
If has("perl") is true, no problem! A syntax region is defined that
does not include any Vim groups, and the perl syntax is included
within the region.
If has("perl") is false, however, the code within perl << EOF to EOF
will be (incorrectly?) highlighted as if it were Vim code.
If has("perl") is false, Vim still tries to run the code as Perl code,
but will raise an error.
Therefore, I think that a containing region should be defined even if
has("perl") is false. However, if has("perl") is false, either the
entire region or at least the "perl << EOF" and the "EOF" should be
highlighted as errors.
The same applies to the other embeddable languages as well.
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