Clarify that safe extern items do not require unsafe #1970
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This clarifies items.extern.fn-safety that it only applies to unsafe items. `safe` items do not require an unsafe context. I think this was just missed in rust-lang#1536.
This rule applies to both fn and static, so remove the "fn" part of the rule name.
In light of `unsafe extern`, we need to note that only unsafe extern
statics need `unsafe { .. }` and to clarify that not all foreign
functions are necessarily unsafe to call.
Co-authored-by: ehuss
Co-authored-by: ehuss
In light of `unsafe extern`, we need to note that this is another position that `unsafe` is allowed. While we're here, let's make some further revisions to clean up the start of this chapter, including separating off into a rule these allowed positions. Co-authored-by: ehuss
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This clarifies items.extern.fn-safety that it only applies to unsafe items.
safeitems do not require an unsafe context.I think this was just missed in #1536.