error[E0423]: expected function, found macro log::set_boxed_logger - did you mean `log::set_boxed_logger!(...)?

[iceiix]

When updating a seemingly unrelated dependency (hyper 0.8.0, to either hyper 0.12.11 or reqwest 0.9.4), I get an error related to setting the boxed logger:

error[E0423]: expected function, found macro `log::set_boxed_logger`                                                                                                                                               
   --> src/main.rs:183:5                                                                                                                                                                                           
    |                                                                                                                                                                                                              
183 |     log::set_boxed_logger(Box::new(proxy))                                                                                                                                                                   
    |     ^^^^^^^^^^^^^^^^^^^^^ did you mean `log::set_boxed_logger!(...)`?                                                                                                                                        
                                                                                                                                                                                                                   
error: aborting due to previous error                                                                                                                                                                              
                                                                                                                                                                                                                   
For more information about this error, try `rustc --explain E0423`.             

I could try to regress further, but any idea what could cause this? If I try the compiler's suggestion, then log::set_boxed_logger! isn't found (and that doesn't match the documentation either so I don't think it is right).

[sfackler]

That's very strange - set_boxed_logger is definitely a function and not a macro! Probably worth filing this over on rust-lang/rust since it seems like a compiler bug.

[iceiix]

The incorrect "expected function, found macro" compile error looks like rust-lang/rust#40788

Found a fix: needed to update the Cargo.toml dependency in my project to include the "std" feature:

-log = "0.4.5"
+log = { version = "0.4.5", features = ["std"] }

[iceiix]

Minimal example:

src/main.rs:

#[macro_use]
extern crate log;

fn main() {
    log::set_boxed_logger(Box::new(1));
}

Cargo.toml:

[package]
name = "logtest"
version = "0.1.0"

[dependencies]
#log = { version = "0.4.6", features = ["std"] }
log = "0.4.6"

Fails with:

error[E0423]: expected function, found macro `log::set_boxed_logger`                                                                                 
 --> src/main.rs:6:5                                                                                                                                 
  |                                                                                                                                                  
6 |     log::set_boxed_logger(Box::new(1));                                                                                                          
  |     ^^^^^^^^^^^^^^^^^^^^^ did you mean `log::set_boxed_logger!(...)`?                                                                            
                                                                                                                                                     
warning: unused `#[macro_use]` import                                                                                                                
 --> src/main.rs:1:1                                                                                                                                 
  |                                                                                                                                                  
1 | #[macro_use]                                                                                                                                     
  | ^^^^^^^^^^^^                                                                                                                                     
  |                                                                                                                                                  
  = note: #[warn(unused_imports)] on by default                                                                                                      
                                                                                                                                                     
error: aborting due to previous error                                

[rakhmanu]

adding std does not work for me I have the same issue with logging E0423