crate-attr
The tracking issue for this feature is: #138287.
The -Z crate-attr flag allows you to inject attributes into the crate root.
For example, -Z crate-attr=crate_name="test" acts as if #![crate_name="test"] were present before the first source line of the crate root.
To inject multiple attributes, pass -Z crate-attr multiple times.
Formally, the expansion behaves as follows:
- The crate is parsed as if -Z crate-attrwere not present.
- The attributes in -Z crate-attrare parsed.
- The attributes are injected at the top of the crate root.
- Macro expansion is performed.