Auto merge of #32023 - matklad:diamonds-and-rust, r=nikomatsakis

tests: add test for empty <>

Rust allows to specify an empty list of type and lifetime parameters, but there are no tests for it:

```
user@UNIT-326 [12:53:45] [~/projects/rust] [diamonds-and-rust]
-> % grep "<>" -R src/test
src/test/compile-fail/generic-type-params-name-repr.rs:    // And don't print <> at all when there's just defaults.
src/test/debuginfo/issue22656.rs:// when trying to handle a Vec<> or anything else that contains zero-sized
```

So let's add them! Besides it's such a wonderful opportunity to put a reference to Judas Priest band into the branch name ;)

0 files changed, 0 insertions, 0 deletions