in reply to parser bug handling 'do ($foo)->{bar}' ?

I guess this comes from the fact that do is also used for flow control, which means it doesn't fall under the "Looks like a function" rule. print "Hello" if(0) || 1; prints "Hello", because if is not a function.

This behaviour is actually documented for last and its kind:

It is also exempt from the looks-like-a-function rule, so last ("foo")."bar" will cause "bar" to be part of the argument to last.
Maybe the documentation for do should mention the same thing.

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Re^2: parser bug handling 'do ($foo)->{bar}' ?
by LanX (Saint) on Oct 14, 2014 at 14:12 UTC
    Thanks a lot that makes things a bit clearer. :)

    But could you explain how do FILE which does per definition an eval is more a flow control than just eval ?

    update

    Not to mention that flow control statements don't return values. (maybe with the exception of short circuiting expressions)

    Cheers Rolf

    (addicted to the Perl Programming Language and ☆☆☆☆ :)

[reply]
[d/l]

      My answer starts by "I guess", so you have to take it for what it is. do FILE; is kinda like goto FILE; except it works. Like goto, do has two different meanings depending on the syntax, and the flow-control side means the keywords are not parsed like most other.

      Edit: I'm not saying that do is always flow control, but that since it may be, the parser deals with it differently

[reply]
        We all are only guessing. ;)

        But asking enough questions might eventually lead to an answer! =)

        Never (modulo Alzheimer) heard of the "looks like function rule" , but Deparse mentions it.

        Grateful for deeper insight!

        Cheers a questioning mind

        (addicted to the Perl Programming Language and ☆☆☆☆ :)

[reply]
        > Edit: I'm not saying that do is always flow control, but that since it may be, the parser deals with it differently

        From do EXPR

         Uses the value of EXPR as a filename and 
executes the contents of the file as a Perl script. 

   do 'stat.pl';

is largely like 

   eval `cat stat.pl`;

        [download]

        hope you understand now why I have problems to see the diff to eval regarding flow control.

        Cheers Rolf

        (addicted to the Perl Programming Language and ☆☆☆☆ :)

[reply]
[d/l]

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