2b399b5275
never_patterns: Parse match arms with no body
Never patterns are meant to signal unreachable cases, and thus don't take bodies:
```rust
let ptr: *const Option<!> = ...;
match *ptr {
None => { foo(); }
Some(!),
}
```
This PR makes rustc accept the above, and enforces that an arm has a body xor is a never pattern. This affects parsing of match arms even with the feature off, so this is delicate. (Plus this is my first non-trivial change to the parser).
~~The last commit is optional; it introduces a bit of churn to allow the new suggestions to be machine-applicable. There may be a better solution? I'm not sure.~~ EDIT: I removed that commit
r? `@compiler-errors`
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|---|---|---|
| .. | ||
| attr | ||
| expand | ||
| util | ||
| ast.rs | ||
| ast_traits.rs | ||
| entry.rs | ||
| format.rs | ||
| lib.rs | ||
| mut_visit.rs | ||
| node_id.rs | ||
| ptr.rs | ||
| token.rs | ||
| tokenstream.rs | ||
| visit.rs | ||