Compiler suggests use of non-existent macro

[jethrogb]

I'm quite puzzled by the compiler guidance here:

use std::env;

fn main() {
    env::vav_os("PATH");
}

error[E0423]: expected function, found macro `env::vav_os`
 --> src/main.rs:4:5
  |
4 |     env::vav_os("PATH");
  |     ^^^^^------
  |     |    |
  |     |    did you mean `var_os`?
  |     did you mean `env::vav_os!(...)`?

Why does it think env::vav_os is a macro?

[Centril]

r? @estebank

[petrochenkov]

Duplicate of #47361, diagnostics check whether the first segment of the path is a macro, and it its (env!(...)).

[petrochenkov]

Suggestions for macros were written before all the macro modularization reforms.

[jethrogb]

This can be closed as a duplicate if the description of #47361 is updated to be more generic.

[estebank]

Current output:

error[E0423]: expected function, found macro `env::vav_os`
 --> src/main.rs:4:5
  |
4 |     env::vav_os("PATH");
  |     ^^^^^^^^^^^
help: a function with a similar name exists
  |
4 |     env::var_os("PATH");
  |          ^^^^^^
help: use `!` to invoke the macro
  |
4 |     env::vav_os!("PATH");
  |     ^^^^^^^^^^^^

Closing as duplicate of #47361.