[lang4d]

I'd be surprised if some combination of ASAN and UBSAN wouldn't catch this and similar dangling references

[steveklabnik]

I thought it should too, but it doesn't seem to, unless I made a mistake, which I probably did: https://godbolt.org/z/Ex63vxj4r

[aw1621107]

I think you need to actually use the dangling reference: https://godbolt.org/z/f4s3fT3nM

[steveklabnik]

Ah, that would make sense, yes. Thanks!