I crashed the Rust compiler for the first time!
And it's a glorious feeling. For so long, I thought that posting about compiler crashes would only be the privilege of expert Rustaceans torturing the compiler to prove the type systems' Turing completeness or whatever, but... I did it!
PS: I don't know what I did, reading the logs now.
Edit: It's a proper panic on stable from type shenanigans.