Drop Order glue

[philberty]

https://doc.rust-lang.org/std/ops/trait.Drop.html

[bjorn3]

In rustc the ptr::drop_in_place function is annotated with #[lang = "drop_in_place"] such that any attempt at getting the MIR of this function results in the drop glue for the respective type being generated and returned. Automatically inserted drops call this function.

ptr::drop_in_place: https://github.com/rust-lang/rust/blob/5258a74c887f8ae14717e1f98b652b470877ce4e/library/core/src/ptr/mod.rs#L190-L198

drop glue generation: https://github.com/rust-lang/rust/blob/5258a74c887f8ae14717e1f98b652b470877ce4e/compiler/rustc_mir/src/shim.rs#L132-L202

[philberty]

Thanks that's really helpful, this might make me want to bring MIR in for this and #144

[bjorn3]

The main shim is manually implemented. There is no MIR generated for it. Left a comment on #144.