Branch: refs/heads/smoke-me/jkeenan/khw/ghpr-17750
  Home:   https://github.com/Perl/perl5
  Commit: 3df86c373fbd9d2c826872aecc4b637dde6ba28d
      
https://github.com/Perl/perl5/commit/3df86c373fbd9d2c826872aecc4b637dde6ba28d
  Author: Karl Williamson <k...@cpan.org>
  Date:   2020-04-26 (Sun, 26 Apr 2020)

  Changed paths:
    M perl.h
    M regcomp.c
    M regcomp.h

  Log Message:
  -----------
  Use dNOOP for otherwise empty declarations

Otherwise, the semi-colon the code has afterwards can be interpreted by
some compilers as ending the block of declarations, and treat any later
declarations in the same block as erors in C89.

For an example, see if this fixes #17725

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