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The odd-looking syntax
mysubroutine {block} @list;
is mentioned in perlsub. Look in the section on prototypes where it describes the "&" prototype character, particularly the sentence "An & requires an anonymous subroutine, which, if passed as the first argument, does not require the sub keyword or a subsequent comma" and also the examples "try", "catch", and "mygrep".
 
On the other hand, it looks to me that map is somewhat more magical than the examples in perlsub; if you call
map (sub { "1" x $_ }, (1..10));
it returns an array of coderefs (references to subroutines) which is not at all what is needed here.
 
Also, not all builtin functions have regular enough syntax to be expressed with a prototype at all. map is one of them:
perl -wle 'print prototype("CORE::map")'
prints
Use of uninitialized value in print at -e line 1.

In reply to Re^3: Generate the perl sequence 1, 11, 111, .... by quester
in thread Generate the perl sequence 1, 11, 111, .... by alih110

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