static ENUM_INTRINSICS_NON_ENUMS: &'static Lint
Expand description
The enum_intrinsics_non_enums
lint detects calls to
intrinsic functions that require an enum (core::mem::discriminant
,
core::mem::variant_count
), but are called with a non-enum type.
Example
ⓘ
#![deny(enum_intrinsics_non_enums)]
core::mem::discriminant::<i32>(&123);
{{produces}}
Explanation
In order to accept any enum, the mem::discriminant
and
mem::variant_count
functions are generic over a type T
.
This makes it technically possible for T
to be a non-enum,
in which case the return value is unspecified.
This lint prevents such incorrect usage of these functions.