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Methods can be called on some "statement-like" expressions
====
https://github.com/rust-lang/rust/blob/master/src/libstd/sys/common/poison.rs#L172
```
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
TryLockError::Poisoned(..) => "poisoned lock: another task failed inside",
TryLockError::WouldBlock => "try_lock failed because the operation would block"
}.fmt(f)
}
```
Method call on a statement-like match
The `ident` fragment matches reserved words
===
Typically used for replacing `self` in macros.
Any integer can cast to a pointer
===================
This includes `u8`
Modules with the same name as primtiive types have interesting lookup quirks
===================
- If a path like `u32::some_name` is seen, if the module `u32` exists in the current scope and `some_name` is an item in that module
- Treat the path as `self::u32::some_name`
- Otherwise, treat it as `<u32 as ?>::some_name`
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