rollup merge of #22127: alexcrichton/stability-holes
There are a number of holes that the stability lint did not previously cover, including: * Types * Bounds on type parameters on functions and impls * Where clauses * Imports * Patterns (structs and enums) These holes have all been fixed by overriding the `visit_path` function on the AST visitor instead of a few specialized cases. This change also necessitated a few stability changes: * The `collections::fmt` module is now stable (it was already supposed to be). * The `thread_local::imp::Key` type is now stable (it was already supposed to be). * The `std::rt::{begin_unwind, begin_unwind_fmt}` functions are now stable. These are required via the `panic!` macro. * The `std::old_io::stdio::{println, println_args}` functions are now stable. These are required by the `print!` and `println!` macros. * The `ops::{FnOnce, FnMut, Fn}` traits are now `#[stable]`. This is required to make bounds with these traits stable. Note that manual implementations of these traits are still gated by default, this stability only allows bounds such as `F: FnOnce()`. Closes #8962 Closes #16360 Closes #20327
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