They aren't exactly equivalent. The difference comes into play with code loading. The local captures will reference the version of the module they were captured with, while remote/external captures will always reference the latest version of the module.
Depending on what the closure is doing, the latter may be perfectly fine, and is more efficient - but there are many situations where that would result in bugs/unexpected behavior. As a result, the compiler cannot make a choice that works in all situations. Obviously, in situations without hot code loading, this is irrelevant - but you can't know if that is the case at compile-time. Hope that provides some useful context on why things work the way they do! Paul On Sat, Mar 23, 2024, at 12:50 PM, 'Rudolf Manusadzhian' via elixir-lang-core wrote: > Hi there! Might be a naive question. > > Why don't we treat all local captures as external? Like at compile time, if > it's possible, we could treat *&fun/0* as *&__MODULE__.fun/0* and get a free > performance boost, if in the end they behave same. > > I was going thought the docs for :telemetry.attach/4 > <https://hexdocs.pm/telemetry/1.2.1/telemetry.html#attach/4> and the > suggestion to avoid using *local* captures raise that thought. > > If that's not possible, does it make sense to add a note in the docs > Kernel.SpecialForms.&/1 # Capture > <https://hexdocs.pm/elixir/1.16.2/Kernel.SpecialForms.html#&/1-capture> about > the performance implications of local capture vs external or a recommendation? > > Thanks. > > > -- > You received this message because you are subscribed to the Google Groups > "elixir-lang-core" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to elixir-lang-core+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elixir-lang-core/c7065947-b48d-43e6-a450-387f6d4f1846n%40googlegroups.com > > <https://groups.google.com/d/msgid/elixir-lang-core/c7065947-b48d-43e6-a450-387f6d4f1846n%40googlegroups.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-core+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/09582a78-ee51-4ac2-9e75-5171cc73763b%40app.fastmail.com.
