E0428 when enum variant and generic parameter share the same name

Summary

the compiler incorrectly throws an E0428 ("defined multiple times") error when an enum variant has the exact same name as a generic type parameter.

Reproducer

I tried this code:

pub enum ForceResult<Leaf, Internal> {
    Leaf(Leaf),
    Internal(Internal),
}

Does the code make use of any (1.49) nightly feature ?

• Nightly

Godbolt link

https://godbolt.org/z/5TM7v5ce9

Actual behavior

test.rs:5:5: error: ‘Leaf’ defined multiple times [E0428]
    4 | pub enum ForceResult<Leaf, Internal> {
      |                      ~~~~
    5 |     Leaf(Leaf),
      |     ^~~~
test.rs:6:5: error: ‘Internal’ defined multiple times [E0428]
    4 | pub enum ForceResult<Leaf, Internal> {
      |                            ~~~~~~~~
    5 |     Leaf(Leaf),
    6 |     Internal(Internal),
      |     ^~~~~~~~

Expected behavior

Compiler returned: 0

GCC Version

master

No source file or test is named. Start by compiling the provided ForceResult reproducer, then trace the compiler's name-resolution path for enum variants and generic parameters; done means the reproducer compiles without E0428 while preserving the expected variant and parameter types.