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All the Perl that's Practical to Extract and Report
You can't even think about them!"
--Larry Wall in Configure from the perl distribution
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C feature (Score:2)
is a standard C feature, so in XS-generated C code it's understood by the C preprocessor. (lex, yacc and other code generators make extensive use of this feature.)
A little-known fact is that perl actually understands this kind of comments as well.
Extracting tests (Score:2)
#line 500 foo.pm
is really handy when you've extracted tests from several sources into one .t