println! does not find any variables inside non-linear async functions

[sdroege]

See https://github.com/sdroege/gtk-rs-examples/blob/0f6c01eb18517d8db28633a54a5aded3341370fd/src/bin/gio_futures_await.rs#L49

That line fails to compile with

error[E0425]: cannot find value `idx` in this scope
 --> <println macros>:3:44
  |
3 | ) => ( print ! ( concat ! ( $ fmt , "\n" ) , $ ( $ arg ) * ) ) ;
  |                                            ^ not found in this scope

error[E0425]: cannot find value `buf` in this scope
 --> <println macros>:3:44
  |
3 | ) => ( print ! ( concat ! ( $ fmt , "\n" ) , $ ( $ arg ) * ) ) ;
  |                                            ^ not found in this scope

error[E0425]: cannot find value `len` in this scope
 --> <println macros>:3:44
  |
3 | ) => ( print ! ( concat ! ( $ fmt , "\n" ) , $ ( $ arg ) * ) ) ;
  |                                            ^ not found in this scope

error: aborting due to 3 previous errors

doing the same with a normal function as in the next line works fine though.

Unfortunately I was not able to reproduce this in a stand-alone testcase so far, it's not clear to me what exactly triggers it.

[Nemo157]

Sounds very similar to alexcrichton/futures-await#95 which is caused by rust-lang/rust#50061

[sdroege]

Yes that's most likely the same. Feel free to close this one

[sdroege]

The next nightly should have this fixed, I'll close it once it is available for testing and if it's indeed fixed

[sdroege]

Works now indeed, thanks!