Compiler version

3.8.0-RC1

Minimized code

val symbols: Set[Char] = Set.from('a' to 'z') ++ Set.from('a' to 'z')

Issue

Compiling this one-liner with -Ysafe-init-global takes over one minute. And it's easy to blow up that time with a few more lines of code. Long compile times, as per the halting problem, become indistinguishable from non-termination, and non-termination is worse than crashing. So while it is not technically a crash, it is arguably worse.