Static rustc_lint::enum_intrinsics_non_enums::ENUM_INTRINSICS_NON_ENUMS

static ENUM_INTRINSICS_NON_ENUMS: &'static Lint

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.