Static rustc_lint::builtin::UNEXPECTED_CFGS
source · pub static UNEXPECTED_CFGS: &'static Lint
Expand description
The unexpected_cfgs
lint detects unexpected conditional compilation conditions.
Example
rustc --check-cfg 'names()'
ⓘ
#[cfg(widnows)]
fn foo() {}
This will produce:
warning: unknown condition name used
--> lint_example.rs:1:7
|
1 | #[cfg(widnows)]
| ^^^^^^^
|
= note: `#[warn(unexpected_cfgs)]` on by default
Explanation
This lint is only active when a --check-cfg='names(...)'
option has been passed
to the compiler and triggers whenever an unknown condition name or value is used.
The known condition include names or values passed in --check-cfg
, --cfg
, and some
well-knows names and values built into the compiler.