deny(unsafe_code) should prevent `global_asm!` usage.

[Lokathor]

Similar to how deny(unsafe_code) prevents #[no_mangle] from being used, it should also prevent global_asm! blocks from being allowed. If misused, they can do any number of strange and horrible thing simply by being within the crate.

[gimbling-away]

@rustbot claim

[Rageking8]

@rustbot label +C-bug +T-compiler

[asquared31415]

I suppose it's probably too late to actually make it require unsafe {}?

[Lokathor]

that isn't even currently possible from a syntax perspective because unsafe blocks only work as expressions, you can't just put them around a top level item. It would take a whole RFC thing, even separately from global_asm already being stable.