Programming Perl, 4th Edition

do (block)

do BLOCK

The do BLOCK form executes the sequence of statements in the BLOCK and returns the value of the last expression evaluated in the block. When modified by a while or until statement modifier, Perl executes the BLOCK once before testing the loop condition. (On other statements, the loop modifiers test the conditional first.) The do BLOCK itself does not count as a loop, so the loop control statements next, last, or redo cannot be used to leave or restart the block. See the section Bare Blocks as Loops in Chapter 4 for workarounds.