[flang-commits] [flang] [flang] Use llvm::is_contained (NFC) (PR #102999)

[Kazu Hirata via flang-commits]

kazutakahirata wrote:

> Why is this a good change?

Because the new code accomplishes the same task with less code, specifically without repeating container names multiple times.

https://github.com/llvm/llvm-project/pull/102999