Need definition for 'construct' (noun) for use in documentation

[jkeenan]

As part of my research on Fatalization of currently deprecated goto
construct I have been
re-reading our current documentation of goto in blead and have been trying
to locate in our test suite examples of each claim made in that documentation.
What we find -- or fail to find -- there will have an impact on the
documentation updates provided as part of a pull request like the current
#23782. I've posted the preliminary results
of that documentation review
here.

This is the sixth in a series of GH issues addressing the items which I
believe are lacking in that documentation.

perldoc -f goto states:

Use of "goto LABEL" or "goto EXPR" to jump into a construct is
deprecated and will issue a warning; it will become a fatal
error in Perl 5.42. While still available, it may not be used to
go into any construct that requires initialization, such as a
subroutine, a "foreach" loop, or a "given" block. 

"[C]onstruct" (as a noun) is a vague term for which we have no definition --
but we use it a lot:

$ ack -i '\bconstruct\b' pod | ack -v delta

Discuss whether we should have a definition and what it should be.

[jkeenan]

I've removed the 'goto-partial-fatalization' label from this issue. While I still think a definition of 'construct' is still needed, it's relevant much more broadly than this particular project.