Re: Context propagation into subs and evals

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Re^2: Context propagation into subs and evals by LanX (Sage) on Feb 20, 2012 at 22:10 UTC
implicit_returns() has two implicit returns, because the calls to tst_context() could be last statement of the sub. Since no_implicit_return() has an explicit return at the end which must be passed, disabling the implicit returns. look here `sub tst { 5 } sub tst { return 5 }` [download] Both functions are equivalent, but in the latter the return is explicit. Cheers Rolf	[reply] [d/l]
Re^3: Context propagation into subs and evals by repellent (Priest) on Feb 20, 2012 at 22:18 UTC
Right, I forgot about the `return;` so I've striked off my question about `no_implicit_return`. As for `implicit_return`, I guess I got confused as to the purpose of the `if` statement. Both the true and false code paths lead to an implicit return of the call to `tst_context`. Me thinks why bother having the `if` at all? :-)	[reply] [d/l] [select]
Re^4: Context propagation into subs and evals by LanX (Sage) on Feb 20, 2012 at 22:28 UTC
The `if` shows that multiple statements can be returned implicitly and it's not necessarily the undermost statement. If you know of a better example illustrating this - at the same time non-trivial and not complex - I'm open for suggestions. :) There is a whole bunch of "Flow-Control-Statements" which could play a role here. Cheers Rolf	[reply] [d/l]


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